WO2009147785A1 - データ通信システム、データ通信要求装置及びデータ通信応答装置 - Google Patents
データ通信システム、データ通信要求装置及びデータ通信応答装置 Download PDFInfo
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- WO2009147785A1 WO2009147785A1 PCT/JP2009/002082 JP2009002082W WO2009147785A1 WO 2009147785 A1 WO2009147785 A1 WO 2009147785A1 JP 2009002082 W JP2009002082 W JP 2009002082W WO 2009147785 A1 WO2009147785 A1 WO 2009147785A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1438—Negotiation of transmission parameters prior to communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
Definitions
- the present invention relates to technology related to selection of a communication method in a data communication system including a plurality of communication devices connected via a communication path capable of full duplex communication and half duplex communication.
- a full-duplex communication mode is continued between two communication devices connected by a two-wire communication path capable of full-duplex communication when transmission requests from both communication devices are detected simultaneously. If the data communication is performed as it is and only the transmission request from one of the communication devices is detected, the data communication is performed after switching to the half duplex communication mode.
- the two communication paths are controlled such that the communication directions of the two communication paths are from the one communication apparatus to the other communication apparatus.
- Data communication by half duplex communication is controlled such that the communication directions of the two communication paths are from the one communication apparatus to the other communication apparatus.
- the one communication apparatus when one communication apparatus whose transmission processing capacity is equal to or less than the bandwidth of the communication channel on one side transmits data by half duplex communication, the one communication apparatus transmits two communication channels exceeding the transmission processing capacity. Since the transmission buffer is underflowed because the data is exclusively used for transmission, transmission and reception is stopped and communication efficiency is reduced.
- the one communication apparatus may perform two communications exceeding the reception processing capacity. Since the path is occupied for reception, a receive buffer overflow occurs and data loss occurs. Therefore, when data loss occurs, a re-transmission procedure is required and communication efficiency is significantly reduced.
- the present invention provides a data communication system, a data communication request device, a data communication response device, a communication method, a data communication request method, and a data communication response method capable of switching the communication method without lowering the communication efficiency. With the goal.
- the present invention comprises a first device and a second device capable of full-duplex communication, and uses a communication path connecting the first device and the second device.
- Data communication system for selecting one of full-duplex communication and half-duplex communication to perform data communication, wherein the first device performs half-duplex communication according to the communication processing capability of its own device.
- Communication request means for generating a request signal including a first communication flag indicating whether or not to specify, and transmitting the request signal to the second device through the communication path;
- a response signal to the request signal including a second communication flag indicating whether to specify is received from the second device, and based on the first communication flag and the second communication flag, between the second device and the second device
- the communication apparatus includes a first selection unit that selects a communication method according to the communication processing capability of both of communication, and a first communication unit that performs data communication by the selected communication method, and the second device transmits the request signal.
- Communication response means for generating the response signal including the second communication flag based on the communication processing capability of the second device, and transmitting the response signal to the first device via the communication path;
- Second selecting means for selecting a communication method according to the communication processing capability of both full duplex communication and half duplex communication according to the procedure based on the communication flag and the second communication flag;
- second communication means for performing data communication by a method.
- both devices are the same.
- the communication method of can be selected.
- the communication method can be determined by the handshake of the request signal and the response signal necessary for starting the data communication between both devices, the communication between the two devices can be performed without requiring an extra procedure for determining the communication method.
- a communication scheme can be made according to the processing capacity. Therefore, the data communication system can suppress the occurrence of underflow or overflow of the transmission / reception buffer mentioned as the problem, and can perform the data communication without lowering the communication efficiency.
- the communication request means receives information on the communication processing capability of the second device, and uses the communication processing capability indicated by the received information and the communication processing capability of the own device. To generate a priority flag indicating any one of the first device and the second device, store the generated priority flag in a predetermined first storage area, and transmit it to the second device, and the communication The response means stores the received priority flag in a predetermined second storage area when the priority flag is received, and in the procedure, the contents indicated by the first communication flag and the second communication flag are the same.
- the communication method based on the content is selected, and if it is determined that they are not the same, the first selection unit in the first recording area Memory It is assumed that the second selection means includes selecting the communication method designated by the device to be prioritized indicated by the communication flag based on the priority flag stored in the second recording area in the second selection means. It is also good.
- the first device and the second device share the priority flag with each other and use them when selecting the communication method, when the content indicated by the first communication flag is different from the content indicated by the second communication flag It is possible to prevent selecting different communication methods from one another.
- the communication processing capacity includes the capacity of a buffer used to receive data
- the request signal indicates that the first device requests data transmission and the communication type indicates that the data is received.
- the communication request means determines whether or not the capacity of the buffer of both the first device and the second device can secure an amount of data to be transmitted in a communication band of half duplex communication. If the determination result is positive, a priority flag indicating the device transmitting the data is generated, and if the determination result is negative, a priority flag indicating the device receiving the data is generated.
- the first selection unit and the second selection unit are included in the signal transmitted by the device serving as the data transmission side based on the communication type when the priority flag indicates the device that transmits the data.
- Communication flag is If the communication mode is selected and the priority flag indicates the device that receives the data, the communication indicated by the communication flag included in the signal transmitted by the device on the data receiving side based on the communication type The method may be selected.
- the first device and the second device are used when receiving data in each of the first device and the second device.
- the communication scheme is selected based on the contents of the communication flag transmitted from any device of the device transmitting data and the device receiving data by using the priority flag defined using the capacity of the buffer to be .
- the data communication system can prevent buffer overflow on the receiving side when the priority flag indicates a device on the receiving side, and maximizes transmission capability of the transmitting side if the priority flag indicates a device on the transmitting side. It can be used as long as possible.
- the communication request means compares the communication processing capability indicated by the received information with the communication processing capability of the own device, and generates a priority flag indicating a device whose communication processing capability is judged to be inferior according to the comparison result,
- the first selection means and the second selection means select the communication method indicated by the first communication flag when the priority flag indicates the first device, and the priority mode indicates the second device when the priority flag indicates the second device.
- the communication method indicated by the second communication flag may be selected.
- the first device and the second device can use the priority flag to set the first device and the second device.
- the first device and the second device can use the priority flag to set the first device and the second device.
- the communication designated by the device with inferior communication processing capacity By selecting the method, both devices can reliably perform processing within their own communication processing capacity at the time of data communication.
- the communication request means receives information related to the communication processing capability of the second device, and either the communication processing capability indicated by the received information or the communication processing capability of the own device If one side does not satisfy communication processing capacity by half duplex communication, priority is given to full duplex communication, and if both communication processing capacities satisfy communication processing capacity by half duplex communication, half duplex communication A priority flag indicating that priority is to be given is stored in a predetermined first storage area and transmitted to the second device, and the communication response means receives the priority flag, and receives the received priority flag as a predetermined number.
- the procedure determines whether the contents indicated by the first communication flag and the second communication flag are the same, if it is determined that they are the same, Communication based If the formula is selected and judged not to be the same, the first selecting means stores the priority flag stored in the first storage area, and the second selecting means stores the second storage area. It may include selecting a communication system to be prioritized based on the priority flag being selected.
- the first device and the second device have priority determined based on the communication processing capabilities of both of them.
- the communication method is selected based on the flag.
- the first communication flag indicates that communication by half duplex communication is designated, that communication by full duplex communication is designated, and any of full duplex communication and half duplex communication may be used. If the communication response means indicates that the first communication flag included in the request signal may be either full-duplex communication or half-duplex communication, the full-duplex communication is used.
- the response signal includes a second communication flag indicating any of designation of communication and designation of communication by half duplex communication, and in the procedure, the first communication flag includes full duplex communication and half duplex. When indicating that any communication of communication may be included, it may be included to select a communication method indicated by the second communication flag.
- the second communication flag specified by the second communication device should be used.
- both devices can perform data communication within the communication processing capacity.
- the first communication flag indicates either designating communication by half duplex communication or designating communication by full duplex communication
- the second communication flag indicates communication by half duplex communication. Indicates that any of full duplex communication and half duplex communication may be used, and the above-mentioned procedure may be performed on the second communication flag When indicating that any communication of double communication and half duplex communication may be performed, it may be included to select the communication method indicated by the first communication flag.
- the second communication device may use either full-duplex communication or half-duplex communication
- the first communication flag specified by the first communication device should be used.
- both devices can perform data communication within the communication processing capacity.
- the communication request means includes the first communication flag corresponding to the communication processing capability of the own device in the request signal, whether the data size of the data to be subjected to the data communication is a predetermined size or more If it is determined that the size is smaller than the predetermined size, the first communication flag indicating that half duplex communication is not specified is included in the request signal, and it is determined that the size is equal to or larger than the predetermined size.
- half duplex communication is selected at the time of data communication of a relatively small size, and it is possible to prevent the communication efficiency from being degraded due to the time overhead required for switching the communication channel direction.
- the present invention makes a request for data communication to another device capable of full-duplex communication, and either full-duplex communication or half-duplex communication using a communication path connected to the other device.
- a request signal including a first communication flag indicating whether or not to use half duplex communication as a communication method according to the communication processing capability of the own device.
- Communication request means for transmitting the request signal to the other device via the communication path, and after sending the request signal, designating use of half duplex communication as a communication method based on the communication processing capability of the other device
- Procedures, full duplex communication and Characterized in that it comprises selection means for selecting a communication mode corresponding to both the communication capacity of the half-duplex communication, and communication means for performing data communication with the selected communication scheme.
- the data communication request device selects the same communication scheme for both the own device and the other device according to a predetermined procedure based on the first communication flag and the second communication flag. Further, since the selected communication method corresponds to the communication processing capability of both devices, each device does not perform processing exceeding its own communication processing capability even if the selected communication method is used. . Therefore, the data communication request device can perform data communication without reducing the communication efficiency.
- the communication request means receives information on the communication processing capability of the other device, and compares the communication processing capability indicated by the received information with the communication processing capability of the own device.
- a priority flag indicating that a communication flag designated by a device determined to have inferior communication processing capacity according to the comparison result should be prioritized is stored in the predetermined storage area for sharing with the other device, and the other It is transmitted to the device, and the procedure determines whether the content indicated by the first communication flag and the content indicated by the second communication flag is the same, and when it is determined that the content is the same, the communication based on the content
- the selection means designates the communication designated by the device to be prioritized indicated by the communication flag based on the priority flag stored in the storage area. It may include selecting an expression.
- the data communication request device shares the priority flag with the other device and uses it when selecting the communication method. Therefore, when the content indicated by the first communication flag and the content indicated by the second communication flag are different from each other. It is possible to prevent selection of a different communication scheme.
- transmission and reception of data are performed a plurality of times using the communication channel, and a request signal is generated and sent out for each transmission and reception of data, and the communication request means
- the current communication processing capability of the own device is compared with the processing capability of the other device, and the priority flag stored in the first storage area is updated according to the comparison result.
- a request signal including a priority flag for update may be generated and sent to the other device.
- the data communication request device updates the priority flag during data communication, so when transmitting and receiving data during data communication, select a communication method according to the communication processing capability of each other at that time. Can.
- a request for data communication is received from another device capable of full-duplex communication, and any one of full-duplex communication and half-duplex communication using a communication path connected to the other device is used.
- Request signal including a first communication flag indicating whether half duplex communication is designated as a communication method according to the communication processing capability of the other device.
- Selection means for selecting a communication scheme characterized in that it comprises a communication means for performing data communication with the selected communication scheme.
- the data communication response device selects the same communication scheme for both the own device and the other device according to a predetermined procedure based on the first communication flag and the second communication flag. Further, since the selected communication method corresponds to the communication processing capability of both devices, each device does not perform processing exceeding its own communication processing capability even if the selected communication method is used. . Therefore, the data communication response device can perform data communication without reducing the communication efficiency.
- the communication response means prior to the reception of the request signal, gives priority to the priority that a communication flag designated by a device with inferior communication processing capability is to be given priority among the data communication response device and the other device.
- the received priority flag is stored in a predetermined storage area, and the procedure determines whether the contents indicated by the first communication flag and the second communication flag are identical or not. If it is determined that the communication method is based on the content, and if it is determined that they are not the same, the communication flag should indicate the priority based on the priority flag stored in the storage area.
- the method may include selecting a communication scheme designated by the device.
- the data communication response device shares the priority flag with the other device and uses it when selecting the communication method. Therefore, when the content indicated by the first communication flag is different from the content indicated by the second communication flag, It is possible to prevent selection of a different communication scheme.
- data transmission / reception is performed a plurality of times using the communication channel, and the other device transmits a request signal each time data is transmitted / received, and the communication response unit is the data communication
- the information related to the communication processing capacity of the other device is received and stored, and the current communication processing capacity of the own device and The processing capability of the other device is compared, the priority flag stored in the storage area is updated according to the comparison result, and a response signal including the priority flag for the update is generated and sent to the other device.
- the data communication response device updates the priority flag during data communication, so when transmitting and receiving data during data communication, select a communication method according to the communication processing capability of each other at that time. Can.
- the communication path is formed of two serial communication paths
- the other device includes at least two first terminals and second terminals used for data communication
- the data communication response device is And at least two third terminals and a fourth terminal used for data communication, the first terminal and the third terminal being detachable from the other device, the first terminal and the third terminal being attached to the other device; It may be a memory card or an I / O card which forms the two serial communication paths by connecting the two terminals and the fourth terminal.
- a memory card or an I / O card can be used as a data communication response device, these cards can perform data communication without reducing communication efficiency with other devices.
- FIG. 2 is a block diagram showing the configuration of communication devices 20 and 30 in the data communication system 10. It is a figure which shows the flow of communication at the time of sharing control information.
- FIG. 6 is a diagram showing an example of the data structure of a request signal 60.
- FIG. 7 is a diagram showing an example of the format of the data structure of a response signal 70. It is a figure which shows the example of a format of priority flag 230,330.
- FIG. 2 is a diagram showing a configuration of a switching unit 204.
- FIG. 7 is a diagram showing a configuration of a switching unit 304. It is a figure which shows the structure in case the master 20 transmits data to the slave 30 by half duplex communication.
- 5 is a flowchart showing an outline of processing in the data communication system 10; 5 is a flowchart showing processing of a master 20. It is a flowchart which shows a communication request
- FIG. It is a flow chart which shows communication response processing. It is a flowchart which shows operation
- FIG. 1 shows the overall configuration of a data communication system 10 according to an embodiment of the present invention.
- the data communication system 10 includes a communication device (master) 20, a communication device (slave) 30, and a communication path 40.
- the communication path 40 is composed of the communication paths 400 and 401, and realizes full duplex communication and half duplex communication between the master 20 and the slave 30.
- the master 20 is a device that outputs a request signal as a trigger to start communication
- the slave 30 is a device that receives a request signal and outputs a response signal to the master 20 when communication is ready.
- the relationship between the master 20 and the slave 30 is fixed.
- the master 20 and the slave 30 specify a communication method according to the communication processing capability of the own device from full-duplex communication and half-duplex communication, and use the same communication method from the specified communication method.
- the data communication refers to transmission / reception of data to be actually processed by the master 20, that is, data to be written from the master 20 to the slave 30 and data to be read from the slave 30 by the master 20.
- the master 20 and the slaves 30 perform data communication in the same selected communication method.
- predetermined method communication by full duplex communication is performed as a predetermined communication method (hereinafter, referred to as “predetermined method”).
- the master 20 includes a transmitting unit 201, a receiving unit 202, a processing unit 203, a switching unit 204, and a control unit 205.
- Transmission unit 201 and reception unit 202 Each of the transmission unit 201 and the reception unit 202 has a function such as a DMA (Direct Memory Access) circuit, and absorbs the difference between the communication bandwidth in the communication paths 400 and 401 between the devices and the data processing capability of the processing unit 203.
- DMA Direct Memory Access
- the buffers 210 and 211 are provided.
- Control unit 205 includes a CPU, a memory, and the like, and controls data communication while monitoring the state of data communication.
- control unit 205 includes a communication request unit 220, a communication scheme selection unit 221, and a priority flag storage unit 222.
- the control unit 205 executes processing relating to data to be transmitted to the slave 30 and data received from the slave 30.
- the data processing referred to here is processing when the master 20 reads data from the slave 30 or processing when writing data to the slave 30.
- the read processing includes processing for storing a read request to the slave 30 and the received data in a storage unit (not shown) such as the HDD. Further, the processing in writing includes processing relating to a write request to the slave 30.
- initialization of communication refers to transmission / reception of data for sharing information related to communication, which is performed before transmission / reception of data that the master 20 should actually process.
- the communication request unit 220 stores control information for the own apparatus in advance.
- the control information includes a data address space that can be transmitted and received, a basic data block length that the own device can handle in data communication, a capacity of a buffer that each of the transmitting unit 201 and the receiving unit 202 has, and a communication method in the own device. It is the switching time, the processing speed of data processing (data processing rate) or the like.
- each of these data is treated as control information
- the control information data address space that can be transmitted and received, basic data block length, buffer capacity, switching time, processing speed
- I / O control register mapped to the address space.
- the communication request unit 220 generates an I / O reception request signal 50 for requesting control information possessed by the slave 30 in order to share control information necessary for communication with the slave 30.
- the generated I / O reception request signal 50 is converted into a data packet signal in units of packets by the processing unit 203, and is sent to the slave 30.
- the I / O reception request signal 50 is a signal including an I / O reception 501 and an I / O address 502.
- the I / O reception 501 is an identifier for requesting readout of control information that the slave 30 has, and the I / O address 502 is for identifying control information (control register) that is an object of readout request. .
- the communication request unit 220 generates an I / O reception request signal 50 for each piece of data (for example, data address space, buffer capacity, basic data block length, switching time, processing speed) for which reading is requested, and generated I The / O reception request signal 50 is sequentially sent to the slave 30.
- data for example, data address space, buffer capacity, basic data block length, switching time, processing speed
- the communication request unit 220 After sequentially transmitting the I / O reception request signal 50, the communication request unit 220 sequentially processes the control information (data address space, buffer capacity, basic data block length, switching time, processing speed) 503 of the slave 30. It receives from the slave 30 via the unit 203.
- the communication request unit 220 compares the received control information 503 with the corresponding control information of itself to determine control information to be used in data communication. For example, upon receiving a buffer capacity as control information from the slave 30, the communication request unit 220 determines a buffer capacity smaller than its own buffer capacity as control information to be used in data communication. Further, in the case of the basic data block length, the shorter block length is determined as control information at the time of data communication, and in the case of switching time and processing time, the longer time is determined as control information at the time of data communication. That is, the communication request unit 220 determines one having a low communication processing capacity between both devices as control information to be used in data communication.
- the communication request unit 220 generates an I / O transmission request signal 51 to which the determined control information 512 is added.
- the generated I / O transmission request signal 51 is converted into a data packet signal in units of packets by the processing unit 203, and is sent to the slave 30.
- the I / O transmission request signal 51 is a signal including an I / O reception 510 and an I / O address 511, and the control information 512 determined as the subsequent to the signal. Is added.
- the I / O reception 510 and the I / O address 511 are the same as those included in the I / O reception request signal 50.
- the communication request unit 220 generates a priority flag based on each other's communication processing capability.
- the priority flag is shared by the respective devices, and is used as needed when selecting the communication method. For example, priority is given to the communication methods specified by the master 20 among the mutually specified communication methods. It indicates that either the effect or the effect that the slave 30 designates is given priority.
- the communication request unit 220 stores the generated priority flag in the priority flag storage unit 222 and also sends it to the slave 30. Thereby, the priority flag can be shared between both devices.
- the communication request unit 220 When generating the priority flag, the communication request unit 220 gives priority to the communication method designated by the device corresponding to the longer processing time using the data processing processing time (data transfer rate) as the communication processing capacity. Decide on.
- control information necessary before the start of communication can be shared between the device itself and the slave 30, and communication becomes possible.
- the communication request unit 220 After sharing the control information necessary for data communication in the above-described communication initialization, the communication request unit 220 generates a request signal 60 prior to transmission / reception of data to be read or written. The generated request signal is converted into a data packet signal in units of packets by the processing unit 203, and is sent to the slave 30.
- the request signal includes, for example, a communication type 601, a communication mode flag 602, an address 603, and a size 604, as shown in FIG. 3 (a).
- the communication type 601 indicates the type of the signal. For example, the value “00” indicates an I / O transmission request signal, "01" indicates an I / O reception request signal, and "10” indicates a data transmission request signal. “11” indicates a data reception request signal.
- the communication mode flag 602 is for identifying a communication system to be used for data transmission and reception. For example, the value "0" indicates full duplex communication and "1" indicates half duplex communication. Here, the fact that the value "0" indicates full duplex communication means that half duplex communication can not be performed.
- the address 603 indicates the start position to write the data when the master 20 requests the writing of data, and indicates the start position to read the data when the master 20 requests to read the data.
- the size 604 indicates the size of data to be written when the master 20 requests the writing of data, and indicates the size of data to be read when the master 20 requests the reading of data.
- the I / O reception request signal 50 and the I / O transmission request signal 51 shown in FIGS. 2A and 2B have the communication mode flag 602 and the size 604 in the request signal 60 shown in FIG. And are omitted.
- the communication type 601 indicates an I / O reception request signal or an I / O transmission request signal
- the communication content is control information (control register) and the size is usually fixed, so the size 604 is Further, since control information is relatively small in size, it is desirable to perform I / O transmission and reception only by full duplex communication in consideration of communication system switching overhead.
- the communication mode flag 602 may not be added because it is not necessary to change the communication method as it is in communication.
- the I / O reception request signal 50 and the I / O transmission request signal 51 may have the same data structure as the request signal 60 without omitting the communication mode flag 602 and the size 604.
- the communication request unit 220 determines the communication method to be notified to the slave 30 when generating the request signal 60. For example, the communication request unit 220 determines whether the size of data to be transmitted or to be received is large enough to ignore the overhead of direction switching of the communication paths 400 and 401. Here, if the size of data to be actually transmitted or to be received is sufficiently large compared to the threshold value set according to the overhead of direction switching of the communication paths 400 and 401, determination of the communication system based on the transmission / reception capacity is performed. Otherwise, the communication scheme designated to the slave 30 is determined to be full-duplex communication, that is, the communication request unit 220 sets a mode (value "0") indicating full-duplex communication in the communication mode flag 602. .
- the communication request unit 220 calculates a buffer size necessary for data transmission and reception using Equation 1 shown below.
- the communication request unit 220 determines whether the calculated buffer size can be secured by the buffer 210 when requesting data writing, and determines that the communication mode flag 602 is half duplex when determining that the calculated buffer size can be secured.
- a mode indicating half-duplex communication in the communication mode flag 602 (Value “1”) is set, and when it is determined that securing is not possible, a mode (value “0”) indicating full-duplex communication is set in communication mode flag 602.
- the communication request unit 220 receives a response signal 70 corresponding to the transmitted request signal from the slave 30 via the processing unit 203.
- the response signal 70 includes, for example, the communication availability 701 and the communication mode flag 702 as shown in FIG.
- Communication availability 701 stores information indicating whether the request signal 60 transmitted by the master 20 has been received, or whether the address 603 or the size 604 included in the request signal 60 has an error and is not received, for example, The value “0” indicates that the request signal 60 has been received (communication is possible), and “1” indicates that the request signal is not received (communication failure (error)).
- the communication mode flag 702 is for identifying the communication method determined (designated) by the slave 30, and the content thereof is the same as the communication mode flag 602.
- the communication mode selection unit 221 uses the communication mode flags 602 and 702 included in each of the request signal 60 transmitted to the slave 30 by the own device and the response signal 70 received from the slave 30 among full-duplex communication and half-duplex communication.
- One of the communication methods is uniquely selected, and control relating to switching of the switching unit 204 is performed according to the result. The selection method and control relating to switching will be described later.
- the communication system selection unit 221 restores the communication system to the default system.
- the priority flag storage unit 222 has an area for storing the priority flag 230 shared between the own device and the slave 30, and is prioritized at the time of initialization of communication. A flag is stored in the area. The setting of the priority flag is performed by the communication request unit 220 as described above.
- priority flag 230 is shown in FIG. According to this, when the value indicated by the priority flag 230 is "0", it indicates that the master is prioritized, that is, the communication mode indicated by the communication mode flag included in the request signal is prioritized, and the value is "1". In this case, it indicates that slave priority is given, that is, priority is given to the communication method indicated by the communication mode flag included in the response signal.
- Processing unit 203 processes data to be transmitted to the slave 30 (data to be written to the slave 30), generates a packet signal in units of packets, and transmits the packet signal to the slave 30 via the transmission unit 201.
- the processing unit 203 converts the I / O reception request signal 50, the I / O transmission request signal 51, and the request signal 60 at the time of data communication received from the control unit 205 into packet signals in packet units and transmits them. Transmit to slave 30 via unit 201.
- the processing unit 203 processes the received data accumulated in the buffer 211 and transmits the processing to the control unit 205. For example, the processing unit 203 outputs the control information 503 and the response signal 70 to the control unit 205.
- the switching unit 204 switches the direction of the communication paths 400 and 401 according to the communication mode selected by the communication mode selection unit 221, that is, whether the communication mode at the time of data transmission / reception is full duplex communication or half duplex communication, The connection between the transmission unit 201 and the reception unit 202 is switched.
- the switching unit 204 includes differential transmitters 245 and 247 and differential receivers 246 and 248, as shown in FIG.
- the differential transmitters 245 and 247 and the differential receivers 246 and 248 are for transmitting and receiving serial data using the communication paths 400 and 401.
- the operations of the differential transmitters 245 and 247 and the differential receivers 246 and 248 are controlled by the control unit 205 as described above.
- the control relating to the switching by the communication method selection unit 221 selectively enables either one of the differential transmitters 245 and 2479 and the differential receivers 246 and 248 connected to the communication paths 400 and 401. Switching to either full-duplex communication or half-duplex communication. For example, when the communication system selection unit 221 selects full-duplex communication as the communication system, the communication system selection unit 221 controls the differential transmitter 245 and the differential receiver 248 to be effective, thereby switching the communication system. To be done. When half duplex communication is selected as the communication method, when the master 20 requests data reception, the communication method selection unit 221 controls the differential receivers 246 and 248 to be effective, and the master 20 performs data control. When transmission is requested, the communication method is switched by controlling the communication method selection unit 221 to enable the differential transmitters 245 and 247.
- bit synchronization control is usually performed after switching of the communication scheme, this is not the essence of the invention, and thus the description thereof is omitted here.
- the slave 30 includes a transmitting unit 301, a receiving unit 302, a processing unit 303, a switching unit 304, and a control unit 305.
- Transmission unit 301 and reception unit 302 Each of the transmitting unit 301 and the receiving unit 302 has buffers 310 and 311 as shown in FIG. 1, similarly to the transmitting unit 201 and the receiving unit 202 which the master 20 has.
- Control unit 305 includes a CPU, a memory, and the like, and controls communication while monitoring the state of data communication in the same manner as the control unit 205 of the master 20. As shown in FIG. A section 320, a communication scheme selection section 321, and a priority flag storage section 322 are included.
- the control unit 305 executes processing relating to data to be transmitted to the master 20 and data received from the master 20.
- the data processing referred to here is the same as the data processing in the master 20, so the description thereof is omitted here.
- processing is also performed on initialization of communication performed to share information (control information) related to communication between the respective devices.
- the communication response unit 320 stores control information for the own apparatus in advance.
- the communication response unit 320 receives the I / O reception request signal 50 from the master 20 via the receiving unit 302 and the processing unit 303.
- the communication response unit 320 transmits the control information 503 requested by the received I / O reception request signal 50 to the master 20. At this time, the control information 503 to be transmitted is converted into a data packet signal in units of packets by the processing unit 303 and is sent to the master 20.
- the communication response unit 320 receives, via the processing unit 303, the I / O transmission request signal 51 to which the control information 512 to be shared with the master 20 is added, the communication response unit 320 adds it to the received I / O transmission request signal 51
- the stored control information 512 is stored in a predetermined storage area.
- the communication response unit 320 stores the received priority flag in the priority flag storage unit 322.
- control information necessary before the start of communication can be shared between the device itself and the master 20, and communication becomes possible.
- the communication response unit 320 shares control information necessary for data communication in the above-described communication initialization, and then receives a request signal 60 from the master 20 via the reception unit 302 and the processing unit 303, as a response signal 70. Generate At this time, the communication response unit 320 performs an error check on the received request signal 60, sets the value “1” in the communication availability 701 when an error is detected, and communicates availability 701 when an error is not detected. Set the value "0" to. Further, the communication response unit 320 determines the communication method to be notified to the master 20 by the same method as the determination method by the communication request unit 220.
- the communication response unit 320 transmits the generated response signal 70 to the master 20 via the processing unit 303 and the transmission unit 301 at timing when transmission and reception of data can be started. At this time, the response signal 70 to be transmitted is converted into a data packet signal in units of packets by the processing unit 303 and is sent to the master 20.
- the communication method selection unit 321 is the same as the communication method selection unit 221 of the master 20, and thus the description thereof is omitted here.
- the priority flag storage unit 322 has an area for storing the priority flag 330 shared between the own device and the master 20, and is prioritized at the time of initialization of communication. A flag 330 is stored in the area. The setting of the priority flag 330 is performed by the communication response unit 320 as described above.
- the priority flag 330 is identical to the priority flag 230 as shown in FIG. 5 (b).
- Processing unit 303 performs processing on data to be transmitted to the master 20 (data to be read by the master 20), generates a packet signal in units of packets, and transmits the packet signal to the master 20 via the transmission unit 301.
- the processing unit 303 also converts the control information 503 received from the control unit 305 and the response signal 70 during data communication into a packet signal in packet units, and transmits the packet signal to the master 20 via the transmission unit 301.
- the processing unit 303 processes the received data accumulated in the buffer 311 and transmits the processing to the control unit 305. For example, the processing unit 303 outputs, to the control unit 305, the I / O transmission request signal 51 and the request signal 60 to which the control information 512 is added.
- the switching unit 304 switches the direction of the communication paths 400 and 401 according to the communication mode selected by the communication mode selection unit 221, that is, whether the communication mode at the time of data transmission / reception is full duplex communication or half duplex communication, and The connection between the transmission unit 301 and the reception unit 302 is switched.
- the details of the switching unit 304 will be described below.
- the switching unit 304 includes differential transmitters 345 and 347 and differential receivers 346 and 348, as shown in FIG.
- the differential transmitters 345 and 347 and the differential receivers 346 and 348 are for transmitting and receiving serial data using the communication paths 400 and 401.
- the operations of the differential transmitters 345 and 347 and the differential receivers 346 and 348 are controlled by the control unit 305 as described above.
- control relating to switching is performed by the communication scheme selection unit 321, but the operation is the same as the control performed by the communication scheme selection unit 221, and thus the description thereof is omitted here.
- bit synchronization control is performed as in the master 20, but since this is not the essence of the invention, the description here is omitted.
- FIG. 1 shows a data communication system 10 in the case of full duplex communication.
- the differential transmitter 245 and the differential receiver 248 are controlled to be effective
- the differential transmitter 247 and the differential receiver 246 are controlled to be effective. Ru. This enables full-duplex communication in which the communication path 400 is downstream and the communication path 401 is upstream.
- FIG. 8 shows the data communication system 10 in the case of transmitting data from the master 20 to the slave 30 with the communication method being half duplex communication.
- the switching units 204 and 304 in half duplex transmission perform transmission processing using the communication channels 400 and 401 for half duplex transmission between the transmission unit 201 of the master 20 and the reception unit 302 of the slave 30. Switch from full duplex communication to half duplex communication, and switch from half duplex communication to full duplex communication.
- the switching unit 204 is controlled so as to make the differential transmitters 245 and 247 effective
- the switching unit 304 is controlled so as to make the differential receivers 346 and 348 effective. This enables half-duplex communication in which both the communication path 400 and the communication path 401 are downlinked.
- FIG. 9 shows the data communication system 10 when the communication system is half duplex communication and the master 20 receives data from the slave 30.
- the switching units 204 and 304 during half duplex reception are for reception processing using the communication channels 400 and 401 for half duplex reception between the reception unit 202 of the master 20 and the transmission unit 301 of the slave 30. Switch from half duplex communication to full duplex communication, and switch from full duplex communication to half duplex communication.
- the switching unit 204 is controlled to be effective in the differential receivers 246 and 248, and the switching unit 304 is controlled to be effective in the differential transmitters 345 and 347. This enables half-duplex communication in which both the communication path 400 and the communication path 401 are upstream.
- Data communication system 10 transmits / receives I / O reception request signal 50, I / O transmission request signal 51 and control information 503, 512 between master 20 and slave 30, and shares control information used for data communication.
- a communication initialization process is performed (step S5). By this processing, the master 20 and the slave 30 can communicate by sharing control information necessary before starting communication.
- the data communication system 10 performs a communication request process of transmitting and receiving a request signal 60 including the communication mode flag 602 designated by the master 20 between the master 20 and the slave 30 (step S10).
- the data communication system 10 performs a communication response process of transmitting and receiving a response signal 70 including the communication mode flag 702 designated by the slave 30 between the master 20 and the slave 30 (step S15).
- the master 20 and the slave 30 in the data communication system 10 use the communication mode flags 602 and 702 designated by each other to be the same.
- a communication method to be used for data communication is uniquely selected by the algorithm (step S20).
- the data communication system 10 performs a data communication process of transmitting and receiving data according to the communication system corresponding to the communication mode uniquely selected by the master 20 and the slave 30 in the communication mode selection process (step S25).
- the data communication system 10 determines whether the communication is completed, that is, whether there is remaining data to be communicated. (Step S30) If it is determined that the communication is completed, the process ends. If not, the process returns to step S10 again to continue the data communication.
- the master 20 executes processing on the master 20 side in the communication initialization processing shown in FIG. 10 (step S100). Specifically, the communication request unit 220 generates an I / O reception request signal 50 and transmits it to the slave 30. Thereafter, when the control information 503 possessed by the slave is received, the control information possessed by the slave is compared with the received control information to determine control information necessary for data communication. Then, the communication request unit 220 generates an I / O transmission request signal, adds the determined control information to the generated I / O transmission request signal, and transmits the I / O transmission request signal to the slave 30. As a result, the master 20 and the slave 30 share control information necessary for communication, and are in a communicable state.
- the communication request unit 220 executes the processing on the master 20 side in the communication request processing shown in FIG. 10 (step S105). At this time, the communication request unit 220 determines the communication method to be notified to the slave 30, generates a request signal 60 including the communication mode flag 602 indicating the determined communication method, and transmits the generated request signal 60 to the slave 30. Do. Detailed operation will be described later.
- the communication request unit 220 executes the process on the master 20 side in the communication response process shown in FIG. 10 (step S110). Specifically, after transmitting the request signal 60, the communication request unit 220 waits for reception of the response signal 70 including the communication mode flag 702 indicating the communication mode designated by the slave 30, and receives the response signal 70 (see FIG. "YES" in step S110), and proceeds to the next step.
- the communication system selection unit 221 executes the communication system selection process shown in FIG. 10 to select the communication system for data communication (step S115).
- full-duplex communication is selected as the communication method ("full-duplex communication" in step S115), as the data communication process shown in FIG. 10, master 20 performs data communication by full-duplex communication (step S120) .
- steps S125 to S135 are performed as data communication processing shown in FIG.
- the operations in steps S125 to S135 correspond to the case where half duplex communication is performed in the data communication process shown in FIG.
- the communication method selection unit 221 switches the communication method from full-duplex communication to half-duplex communication, which is the default method (step S125). Specifically, when the master 20 requests data reception, the communication scheme selection unit 221 controls the differential receivers 246 and 248 to be effective. Further, when the master 20 requests data transmission, the communication scheme selection unit 221 controls the differential transmitters 245 and 247 to be effective.
- the control unit 205 performs data communication according to the switched communication method (step S130).
- the communication method selection unit 221 switches the communication method to the default method by restoring the communication method (step S135). Specifically, the communication scheme selection unit 221 controls the differential transmitter 245 and the differential receiver 248 to be effective.
- the control unit 205 determines whether the communication is completed, that is, whether there is data to be transmitted or received (step S140).
- step S140 determines that the communication is completed, that is, there is no data to be transmitted or received ("YES” in step S140)
- the process ends. If the control unit 205 determines that the communication is not completed, that is, there is data to be transmitted or received ("NO” in step S140), the process returns to step S105.
- the operation in step S140 corresponds to the operation on the master 20 side in the operation of step S30 shown in FIG.
- the data communication system 10 when full-duplex communication is selected, the data communication system 10 performs data communication by full-duplex communication in the communication direction of the communication paths 400 and 401 shown in FIG.
- the communication path as shown in FIG. 8 if the master 20 transmits data to the slave 30 and if the master 20 receives data from the slave 30 as shown in FIG.
- Data communication is performed by half duplex communication according to the communication directions of 400 and 401.
- the communication request unit 220 determines the communication method to be designated to the slave 30, sets a value indicating the determined communication method in the communication mode flag 602 (step S200), and prepares for transmission and reception according to the communication method (step S200) S205).
- the communication request unit 220 generates a request signal 60 including the communication mode flag 602 indicating the communication method determined in step S200, and outputs the generated request signal 60 to the slave 30 (step S210).
- the communication request unit 220 determines whether the size of data to be transmitted or received is larger or smaller than a predetermined threshold (step S250).
- the communication request unit 220 sets the communication mode flag 602 to a value "0" indicating full duplex communication in the communication mode (step S265).
- the communication request unit 220 can use the formula 1 to make sure that the calculated buffer size can be secured by the buffer 210 when requesting writing of data.
- the communication request unit 220 When it is determined that the communication can be secured, that is, it is determined that communication by half duplex communication is possible ("half duplex communication is possible" in step S255), the communication request unit 220 indicates half duplex communication in the communication mode flag 602. The mode (value "1") is set (step S260). When it is determined that securing is not possible, that is, it is determined that communication by half duplex communication is not possible ("half duplex communication is not possible" in step S255), communication request unit 220 indicates full duplex communication in communication mode flag 602. Set the mode (value "0").
- the communication scheme selection unit 221 determines whether the communication mode flag 602 included in the request signal 60 and the communication mode flag 702 included in the response signal 70 match (step S300).
- the communication method selection unit 221 selects the communication method indicated by the communication mode flag 602 or 702 as the communication method used for data communication (step S305).
- the communication mode selection unit 221 uses the priority flag 230 to perform communication indicated by the communication mode flag designated by the device to be prioritized among the communication mode flags 602 and 702.
- a system is selected as a communication system to be used for data communication (step S310).
- the slave 30 executes the processing on the slave 30 side in the communication initialization processing shown in FIG. 10 (step S400). Specifically, upon receiving the I / O reception request signal 50 from the master 20, the communication response unit 320 transmits control information 503 corresponding to the I / O reception request signal 50 to the master 20. Thereafter, upon receiving the I / O transmission request signal 51 to which the control information 512 to be shared with the master 20 is added, the communication response unit 320 stores the received control information 512 in a predetermined storage area. As a result, the master 20 and the slave 30 share control information necessary for communication, and are in a communicable state.
- the communication response unit 320 executes the process on the slave 30 side in the communication request process shown in FIG. 10 (step S405). Specifically, the communication response unit 320 waits for the reception of the request signal 60 including the communication mode flag 602 indicating the communication mode designated by the master 20, and when the request signal 60 is received, proceeds to the next step.
- the communication response unit 320 executes the process on the slave 30 side in the communication response process shown in FIG. 10 (step S410). At this time, the communication response unit 320 determines the communication method to be notified to the master 20, generates a response signal 70 including the communication mode flag 702 indicating the determined communication method, and transmits the generated response signal 70 to the master 20. Do. Detailed operation will be described later.
- the communication system selection unit 321 executes the communication mode selection process shown in FIG. 10 to select a communication system for data communication (step S415).
- the communication system selection process can be realized by the same process flow as in FIG. 14 using the communication mode flag 602 (702) and the priority flag 330, and thus detailed description thereof will be omitted.
- full-duplex communication is selected as the communication method ("full-duplex communication" in step S415), as the data communication process shown in FIG. 10, slave 30 performs data communication by full-duplex communication (step S420) .
- steps S425 to S435 are performed as data communication processing shown in FIG.
- the operations in steps S425 to S435 correspond to the case where half duplex communication is performed in the data communication process shown in FIG.
- the communication system selection unit 321 switches the communication system from full duplex communication to half duplex communication, which is the default system (step S425). Specifically, when the master 20 requests data reception, the communication scheme selection unit 321 controls the differential transmitters 345 and 347 to be effective. Also, when the master 20 requests data transmission, the communication scheme selection unit 321 controls the differential receivers 346 and 348 to be effective.
- the control unit 305 performs data communication according to the switched communication method (step S430).
- the communication method selection unit 321 switches the communication method to the default method by restoring the communication method (step S435). Specifically, the communication scheme selection unit 321 controls the differential transmitter 345 and the differential receiver 348 to be effective.
- the control unit 305 determines whether the communication is completed, that is, whether there is data to be transmitted or received (step S440).
- step S440 If the control unit 305 determines that the communication is completed, that is, there is no data to be transmitted or received (“YES” in step S440), the process ends. If the control unit 305 determines that the communication is not completed, that is, there is data to be transmitted or received (“NO” in step S440), the process returns to step S405.
- the operation in step S440 corresponds to the operation on the slave 30 side in the operation in step S30 shown in FIG.
- the communication response unit 320 determines the communication method to be designated to the master 20, sets a value indicating the determined communication method in the communication mode flag 702 (step S500), and prepares for transmission and reception according to the communication mode (step S500) S505).
- the communication response unit 320 generates a response signal 70 including the communication mode flag 702 indicating the communication mode determined in step S500, and outputs the generated response signal 70 to the master 20 (step S510).
- the process of setting the communication method can be realized by the same process flow as that of FIG. 13, and thus detailed description thereof will be omitted.
- the master 20 generates a request signal 60 including a communication type 601 indicating transmission of data and a communication mode flag 602 indicating half duplex communication as a communication method, and transmits the generated request signal 60 to the slave 30 (step S550).
- the slave 30 Upon receiving the request signal 60, the slave 30 generates a response signal 70 including information indicating that communication is possible and a communication mode flag 702 indicating half duplex as a communication method, and transmits the generated response signal 70 to the master 20. (Step S555).
- the master 20 and the slave 30 select half duplex communication as the communication system from the communication mode flags 602 and 702 included in the request signal 60 and the response signal 70, respectively, so that the own device can perform data communication by half duplex communication.
- the communication method is switched to (step S560).
- the master 20 sends data to the slave 30 by the switched communication mode, that is, half duplex communication (step S565).
- the master 20 and the slave 30 switch the communication mode from half duplex communication to full duplex communication (step S570).
- the communication scheme from step S550 to the switching of the communication scheme in step S560 is full-duplex communication
- the communication scheme from the step S560 to the switching of the communication scheme in step S570 Is half duplex communication.
- the communication scheme from step S560 to the next switching of the communication scheme is full-duplex communication.
- the communication mode flag 602 indicates that both full-duplex communication and half-duplex communication are possible in addition to full-duplex communication and half-duplex communication. Not selected may be set.
- the slave 30 receives the request signal 60 including the communication mode flag 602 (value "10" or "11") indicating non-selection, communication indicating either full-duplex communication or half-duplex communication It is assumed that the mode flag 702 is set.
- the slave 30 when the slave 30 receives the request signal 60 including the communication mode flag 602 indicating either full-duplex communication or half-duplex communication, it is not selected as the communication mode flag 702 as shown in FIG.
- the value "10" or "11" may be set to indicate.
- the communication system selection unit 221 determines whether the communication mode flag 602 included in the request signal 60 and the communication mode flag 702 included in the response signal 70 match (step S600).
- the communication method selection unit 221 selects the communication method indicated by the communication mode flag 602 or 702 as the communication method used for data communication (step S605).
- communication method selection unit 221 determines whether any of communication mode flag 602 and communication mode flag 702 indicates non-selection (step S610). .
- the communication method selection unit 221 uses the priority flag 230 to perform communication specified by the device to be prioritized among the communication mode flags 602 and 702.
- the communication method indicated by the mode flag is selected as the communication method used for data communication (step S615).
- the communication method selection unit 221 performs communication using the communication method indicated by the other communication mode flag not set to "not selected” for data communication A system is selected (step S620).
- an example of the data structure of the priority flags 230 and 330 indicates whether to prioritize the communication method designated by any of the master 20 and the slave 30.
- the master 20 acquires the communication capability (the transmission / reception buffer capacity of the transmission / reception unit, the data processing rate of the processing unit, etc.) as control information of the slave 30 in the communication initialization process and compares it with its own communication capability.
- the priority flags 230 and 330 are prioritized by the low communication capability side and shared by the other devices.
- the priorities set in the master 20 and the slave 30 may be stored in the priority flags 230 and 330, for example, similar to the above by increasing the priority as the communication capability is lower. Communication mode selection is possible.
- the method of indicating the communication method to be prioritized is not limited to the above method.
- the priority flag 230a may indicate either transmission priority or reception priority.
- the communication request unit 220 determines whether the reception capabilities of the master 20 and the slave 30 are equal to or more than the communication band of the half duplex communication mode. Specifically, it is determined by reception buffers 211 and 311 whether or not the amount of data to be transmitted in the communication band in the half duplex communication mode can be secured. If the determination result is positive, the priority flag (transmission priority) is given to the effect that priority is given to the device on the transmitting side at the time of data communication (transmission priority). If the determination result is negative, the receiving side at the data communication A priority flag is set indicating that the device is prioritized (reception priority).
- the communication method specified by the master 20 when the master 20 requests transmission, the communication method specified by the master 20 is prioritized, and when the master 20 requests reception, the communication method specified by the slave 30 is prioritized.
- reception priority when the master 20 requests transmission, the communication method specified by the slave 30 is prioritized, and when the master 20 requests reception, the communication method specified by the master 20 is prioritized.
- the reception capability of the master 20 and the slave 30 is less than the communication band of the half duplex communication mode, it is possible to select a communication method in consideration of buffer overflow on the reception side by giving priority to reception, while receiving them.
- the capability is equal to or higher than the communication band in the half duplex communication mode, by giving priority to transmission, it is possible to select a communication method that makes the best use of the transmission capability of the transmission side.
- the priority flag 230b may indicate whether full duplex priority or half duplex priority.
- the full duplex communication mode is preferred if full duplex communication is prioritized, and the half duplex communication mode if half duplex communication is prioritized. Will be selected.
- the master 20 and the slave 30 mutually select the half duplex communication mode by giving priority to full duplex communication.
- the half-duplex communication mode can be limited, while if their communication capability is above the communication band of the half-duplex communication mode, the master 20 and the slave 30 can mutually communicate by giving priority to half-duplex communication.
- the full duplex mode can be restricted except for selecting the full duplex mode.
- the priority flag 230c (330c) is such that any setting condition of the priority flag shown in FIG. 5 (b) to FIG. 5 (d) can be taken. It is also good.
- the master 20 and the slave 30 share the priority flag in the communication initialization process before the start of data communication, and while the data communication is being performed, the content of the priority flag is Although fixed, it is not limited to this.
- the priority signal 610 may be included in the request signal 60 when selecting the communication method, and the request signal 60 may be transmitted to the slave 30.
- one of the values shown in FIG. 5B is set as the priority 610.
- the determination of the priority value to be set is the same as that of the above embodiment, and thus the description thereof is omitted here.
- the response signal 70 may have a format including the priority 710.
- one of the values shown in FIG. 5B is set as the priority 710.
- the determination of the priority value to be set is the same as that of the above embodiment, and thus the description thereof is omitted here.
- both the master 20 and the slave 30 set the communication method simultaneously with the setting of the communication method in the communication method setting process, and in the communication method selection process, the communication method indicated by the communication mode flag of the request signal and the response signal.
- the communication system having the highest priority can be selected.
- the communication scheme selection unit 221 performs switching from the half duplex communication to the default scheme (full duplex communication).
- This switching may be performed by another component.
- the capacity of the buffer is used for comparison.
- the present invention is not limited to this.
- Data to be transmitted or received may be divided into a plurality of blocks and transmitted or received.
- the master 20 executes processing on the master 20 side in the communication initialization processing shown in FIG. 10 (step S700).
- the communication request unit 220 executes the processing on the master 20 side in the communication request processing shown in FIG. 10 (step S705).
- the communication request process can be realized by the same operation as in FIGS. 12 and 13, and thus detailed description thereof will be omitted.
- the communication request unit 220 executes the process on the master 20 side in the communication response process shown in FIG. 10 (step S710).
- the communication method selection unit 221 executes the communication mode selection process shown in FIG. 10 to select the communication method of data communication (step S715).
- the communication system selection process can be realized by the same operation as that of FIG.
- full-duplex communication is selected as the communication method ("full-duplex communication" in step S715)
- the master 20 e.g., the control unit 205 transmits the data to be communicated as data communication processing shown in FIG. Data communication by full-duplex communication is performed on one block of data (step S720).
- the master 20 determines whether the data communication for all blocks of data to be communicated is completed (step S725).
- control unit 205 determines whether the communication is completed, that is, whether there is data to be transmitted or received (step S750). .
- step S750 If the control unit 205 determines that the communication is completed, that is, there is no data to be transmitted or received (“YES” in step S750), the process ends. If the control unit 205 determines that the communication is not completed, that is, there is data to be transmitted or received (“NO” in step S750), the process returns to step S705, and selects the communication scheme for the next data. And perform data communication.
- step S 725 If it is determined that the data communication for all the blocks is not completed (“NO” in step S 725), the process returns to step S 705 to select the communication scheme for the block to be transmitted next and perform data communication .
- step S715 When half duplex communication is selected as the communication method ("half duplex communication" in step S715), operations of steps S730 to S740 are performed as data communication processing shown in FIG. The operations from step S730 to S740 are the same as the operations from step S125 to step S135 shown in FIG. 11, and thus the description thereof is omitted here.
- control unit 205 determines whether data communication for all blocks of data to be communicated has been completed (step S745).
- step S745 If it is determined that the process has been completed ("YES” in step S745), the process proceeds to step S750. If it is determined that the data communication for all the blocks is not completed (“NO” in step S 745), the process returns to step S 705 to select the communication scheme for the block to be transmitted next and perform data communication .
- the slave 30 executes the processing on the slave 30 side in the communication initialization processing shown in FIG. 10 (step S800).
- the communication response unit 320 executes the process on the slave 30 side in the communication request process shown in FIG. 10 (step S805).
- the communication response unit 320 executes the process on the slave 30 side in the communication response process shown in FIG. 10 (step S810).
- the communication response process can be realized by the same operation as that of FIG. 15, and thus detailed description thereof will be omitted.
- the communication system selection unit 321 executes the communication mode selection process shown in FIG. 10 to select a communication system for data communication (step S815).
- the communication system selection process can be realized by the same process flow as that of FIG. 14, and thus detailed description thereof will be omitted.
- full-duplex communication is selected as the communication method ("full-duplex communication" in step S815)
- the slave 30 e.g., the control unit 305 performs data communication as data communication processing shown in FIG. Data communication by full-duplex communication is performed on one block of data (step S820).
- the slave 30 determines whether the data communication for all blocks of data to be communicated is completed (step S825).
- control unit 305 determines whether the communication is completed, that is, whether there is data to be transmitted or received (step S850). .
- step S850 If the control unit 305 determines that the communication is completed, that is, there is no data to be transmitted or received (“YES” in step S850), the process ends. If the control unit 305 determines that the communication is not completed, that is, there is data to be transmitted or received (“NO” in step S850), the process returns to step S805, and selects the communication scheme for the next data. And perform data communication.
- step S 825 If it is determined that the data communication for all the blocks is not completed (“NO” in step S 825), the process returns to step S 805 to select the communication scheme for the block to be transmitted next, and perform data communication .
- steps S830 to S840 are performed as data communication processing shown in FIG.
- the operations in steps S 830 to S 840 are the same as the operations in steps S 425 to S 435 shown in FIG. 15, and thus the description thereof is omitted here.
- control unit 305 determines whether data communication for all blocks of data to be communicated has been completed (step S845).
- step S845 If it is determined that the process has been completed ("YES” in step S845), the process proceeds to step S850. If it is determined that the data communication for all the blocks is not completed ("NO” in step S845), the process returns to step S805 to select the communication scheme for the block to be transmitted next and perform data communication .
- each of the master 20 and the slave 30 always switches to full-duplex communication when data communication for one block is completed.
- an interruption may occur when data communication for one block is completed.
- an error for example, a CRC error
- the error is notified to the device on the data transmitting side after switching to full-duplex communication, and data for the same block
- the communication paths can not communicate with each other because the communication paths are directed in only one direction. Therefore, by sending an error message (abort message) after recovery to full-duplex communication (after switching), it is possible to abort (forcefully abort) processing related to communication for that block.
- the request signal includes the size of data to be received or transmitted in the above embodiment, the present invention is not limited to this.
- the request signal may not include the size of data to be received or transmitted.
- the master 20 transmits data to the slave 30 in half duplex communication
- the master 20 switches to full duplex communication once.
- the slave 30 On the slave 30 side, when data transmitted from the master 20 in half duplex communication is received, the slave 30 is once switched to full duplex communication.
- each of the master 20 and the slave 30 selects a communication system using the communication mode flag included in each of the request signal and the response signal to transmit and receive the completion message, and transmits and receives the message according to the selected communication system. I do.
- the master 20 when the master 20 receives data from the slave 30 in half-duplex communication, when reception of the data to be received is completed, it switches to full-duplex communication once as in the transmission. On the slave 30 side, when data is transmitted by half duplex communication, it is once switched to full duplex communication. Then, in order to transmit and receive the completion message, each of the master 20 and the slave 30 selects the communication method in the same manner as described above, and transmits and receives the message according to the selected communication method.
- the master 20 and the slave 30 temporarily switch to full-duplex communication, but this is an error on the receiving side as in the case of performing data communication in block units.
- an interrupt may be generated to notify the device on the data transmission side of the error.
- the control units of both devices may be configured to include a communication request unit and a communication response unit. According to this, the relationship between the master and the slave can be switched dynamically. For example, the relationship between the master and the slave may be switched for each communication.
- the device to be a slave may be a memory card or an I / O card that can be attached to and detached from the master 20.
- the memory card is an SD card
- the I / O card is a wireless LAN card for performing wireless communication with another device.
- FIG. 21 is a diagram showing the configuration of the data communication system 10a when the slave 30 shown above is an SD card 30a, and the data communication system 10a is composed of a master 20a and an SD card 30a.
- the same components as the components of the master 20 and the slave 30 described in the embodiment will be assigned the same reference numerals and descriptions thereof will be omitted.
- the master 20a includes a processing unit 203, a control unit 205, and a card I / F unit 206.
- the card I / F unit 206 performs data communication with the SD card 30 a mounted on the master 20, and as shown in FIG. 21, the transmitting unit 201, the receiving unit 202, the switching unit 204, and the pins 207 and 208. Is equipped.
- the pins 207 and 208 are connected to the SD card 30a.
- the SD card 30a has pins 306 and 307 in addition to the components of the slave 30, as shown in FIG.
- Each of the pins 306 and 307 is connected to the pins 207 and 208 of the card I / F unit 206 when the SD card 30 a is attached to the master 20.
- the communication path 400 described above is formed by connecting the pin 207 and the pin 307
- the communication path 401 described above is formed by connecting the pin 208 and the pin 308.
- the connection between the formed communication paths 400 and 401 and the switching units 204 and 304 is the same as that in FIGS. 6 and 7 shown in the embodiment, and thus the description thereof is omitted here.
- the master 20a and the SD card 30a can realize data communication by full duplex communication and half duplex communication via the communication paths 400a and 401a.
- the processing capacity to be compared is the processing time of data processing (data transfer rate), but it is not limited to this. It may be information that can compare the processing capabilities of the master 20 and the slave 30. For example, the capacity of the reception buffer, the capacity of the transmission buffer, or a combination thereof.
- the priority flag indicates slave priority
- the specification of the communication method with the slave 30 may be different because the master 20 specified full-duplex communication despite being capable of half-duplex communication. is assumed. Therefore, half-duplex communication can be selected by both devices by using the priority flag. Since the selected communication method does not exceed the communication processing capability of each device, the communication efficiency does not decrease.
- the selection method in the case of being different from the communication method is not limited to the selection method using the priority flag.
- neither the master 20 nor the slave 30 need to have an area for storing the priority flag.
- full duplex communication is selected when the communication method is different, it is effective when the size of data to be communicated is small.
- the master 20 designates half duplex communication as the basic communication method, and when the size is small, it suffices to designate full duplex communication, so the request from the slave is not necessary.
- half duplex communication may be selected.
- the master 20 notifies the slave 30 that the data to be written is ready. After receiving the notification, the slave 30 notifies the master when a free buffer of the size of the data to be written can be secured. After notification from both of them, transfer of data to be written is started. At the time of reading, conversely, the master 20 secures a free buffer, and the slave 30 notifies each other when data to be read is ready, and then starts data transfer. As described above, half duplex priority is advantageous when data communication is started after data can be transferred to each other with flow control.
- the back pressure type flow control is to start transfer before data is accumulated and to notify WAIT when the receiving side is about to overflow.
- half-duplex communication is always selected when the communication schemes designated by each other are different, the efficiency is degraded. This is because it is necessary to notify the sender of WAIT at any timing from the data receiving side, but it is impossible to notify WAIT if both of them are directed in one direction (from the data transmitting side to the data receiving side) It is.
- half-duplex communication is prioritized if data is already stored in the device as the reception source, and full-duplex so that WAIT can be issued if it is not stored. Prioritize communication.
- the communication processing capacity in the present invention includes the buffer capacity, the switching time of the communication method, the processing speed of data processing, and the buffer size which can be secured at the time of communication Shall be included.
- the communication request unit 220 may send the priority flag as control information to the slave 30.
- the processing unit 203 may include a data processing circuit that outputs a result of performing desired processing on data input from the receiving unit 202 to the transmitting unit 201, or the data input from the receiving unit 202
- a memory that stores and outputs data requested by the transmission unit 201 may be included.
- the present invention may be methods shown above. Further, the present invention may be a computer program that realizes these methods by a computer, or may be a digital signal composed of the computer program.
- the present invention is a computer readable recording medium that can read the computer program or the digital signal, such as a flexible disk, a hard disk, a CD-ROM, an MO, a DVD, a DVD-ROM, a DVD-RAM, a BD (Blu-ray Disc ), And may be recorded in a semiconductor memory or the like. Further, the present invention may be the digital signal recorded on these recording media.
- the computer program or the digital signal may be transmitted via a telecommunication line, a wireless or wired communication line, a network represented by the Internet, data broadcasting, and the like.
- the present invention may be a computer system comprising a microprocessor and a memory, wherein the memory stores the computer program, and the microprocessor operates according to the computer program.
- a plurality of communication devices are connected via a plurality of communication paths capable of full-duplex communication and half-duplex communication, and the communication devices are required in the relationship of master and slave
- a communication system that performs data communication after performing handshaking between a signal and a response signal, and the communication apparatus serving as a master has a communication mode flag indicating whether the communication mode in which data communication is performed is full duplex communication or half duplex communication.
- the communication device that outputs the request signal including the request signal, and becomes a slave in response to the request signal responds by including a communication mode flag indicating whether the communication mode for performing data communication is full duplex communication or half duplex communication.
- a communication response means for outputting a signal is provided, and both of the communication device serving as the master and the communication device serving as the slave respond to communication mode flags of both the request signal and the response signal.
- a communication mode selecting means for selecting the communication mode characterized by comprising a data communication means for performing data communication after switching the plurality of communication paths in the communication mode selected by the communication mode selecting means.
- the communication system can select the communication mode of full duplex communication or half duplex communication in consideration of the transmission / reception processing capability of the communication apparatuses.
- the communication request means outputs a request signal including a communication mode flag indicating whether full-duplex communication or half-duplex communication or those communication modes are not selected, and the communication mode selection means When the request signal includes a communication mode flag indicating an unselected communication mode, the communication mode indicated by the communication mode flag of the response signal may be selected.
- the communication response means outputs a response signal including full-duplex communication or half-duplex communication, or a communication mode flag indicating whether these communication modes are not selected, and the communication mode selection device is configured to transmit the response signal
- the communication mode flag indicating the unselected communication mode is included, the communication mode indicated by the communication mode flag of the request signal may be selected.
- the communication request means outputs a request signal including full-duplex communication or half-duplex communication, or a communication mode flag indicating whether the communication mode is not selected, and the communication response means also performs full-duplex communication.
- a response signal including a communication mode flag indicating whether half-duplex communication or those communication modes are not selected may be output.
- the communication system can switch for each communication whether to set the communication mode designated by the master or the communication mode designated by the slave.
- the communication mode selection means can not uniquely determine the communication mode only from the communication mode flag included in both the request signal and the response signal, the master priority set in advance between the master and the slave The communication mode may be selected in accordance with a priority flag indicating whether it is a slave priority or a slave priority.
- the communication mode selection means can not uniquely determine the communication mode only from the communication mode flag included in both the request signal and the response signal, whether the transmission priority or the reception priority set in advance between the master and the slave The communication mode is selected according to the priority flag indicating.
- the communication mode selection means can not uniquely determine the communication mode only from the communication mode flag included in both the request signal and the response signal, whether the priority is set to the full duplex communication preset between the master and the slave
- the communication mode may be selected according to a priority flag indicating whether half duplex communication is preferred.
- the communication mode selection means can not uniquely determine the communication mode only from the communication mode flag included in both the request signal and the response signal, the communication mode output by the communication device having low communication capability between the master and the slave. May be selected.
- the communication request means outputs a request signal further including the priority of communication mode selection
- the communication response means outputs a response signal further including the priority of communication mode selection
- the communication mode selection The means may select the communication mode according to the priority when the communication mode can not be determined uniquely from only the communication mode flag included in both the request signal and the response signal.
- the communication system can select the communication mode uniquely even when the communication mode specified by the master and the communication mode specified by the slave are different.
- the communication request means is an I / O access to exchange control information between communication devices
- the communication request means means a full-duplex communication and a memory access to read / write data payload.
- a request signal including a communication mode flag of half duplex communication may be output.
- the communication system can be set to a communication mode according to the characteristics of the communication (data size and latency requirements).
- a communication mode of full duplex communication or half duplex communication can be selected for each communication according to each other's transmission and reception capability between the master and slave, and the communication mode is set simultaneously with handshake for starting data communication.
- the present invention can be applied to a communication system that has a feature that can be selected uniquely, and that performs efficient data transfer between devices or functional blocks within the devices.
- the master 20 and the slave 30 according to the present invention can be managerial, that is, repetitively and continuously used in the industry that manufactures and sells devices.
Abstract
Description
以下、本発明に係る通信装置について、図面を用いて説明する。
図1は、本発明の実施形態に係るデータ通信システム10の全体構成を示す。
マスタ20は、図1にて示すように、送信部201、受信部202、処理部203、切替部204及び制御部205から構成されている。
送信部201及び受信部202のそれぞれはDMA(Direct Memory Access)回路のような機能を有し、装置間の通信路400、401における通信帯域と処理部203のデータ処理能力の差を吸収するために、図1にて示すようにバッファ210、211を有している。
制御部205は、CPUやメモリなどから構成され、データ通信の状態を監視しながら、データ通信の制御を行うものである。
ここでは、通信要求部220について説明する。
先ず通信の初期化に係る動作について説明する。なお、通信の初期化とは、マスタ20が実際に処理すべきデータの送受信の前に行われる、通信に係る情報の共有のためのデータの送受信のことをいう。
通信要求部220は、上記の通信初期化にて、データ通信に必要な制御情報を共有した後、読み出し若しくは書き込みがなされるデータの送受信に先立って、要求信号60を生成する。生成された要求信号は処理部203にてパケット単位のデータパケット信号に変換されてスレーブ30へ送出される。
通信方式選択部221は、自装置がスレーブ30へ送信した要求信号60とスレーブ30から受け取った応答信号70のそれぞれに含まれる通信モードフラグ602、702から全二重通信及び半二重通信のうち何れかの通信方式を一意に選択し、その結果に応じて切替部204の切り替えに係る制御を行う。なお、選択方法、及び切り替えに係る制御については、後述する。
優先フラグ記憶部222は、図5(a)にて示すように、自装置とスレーブ30との間で共有する優先フラグ230を記憶するための領域を有しており、通信の初期化時に優先フラグが当該領域に格納される。なお、優先フラグの設定は、上述したように通信要求部220にて行われる。
処理部203は、スレーブ30へ送信すべきデータ(スレーブ30へ書き込むべきデータ)に対して処理を施して、パケット単位のパケット信号を生成して送信部201を介してスレーブ30へ送信する。
切替部204は、通信方式選択部221にて選択された通信方式、つまりデータ送受信時の通信モードが全二重通信か半二重通信かに応じて通信路400、401の方向の切り替え、及び送信部201、受信部202との接続の切り替えを行う。
スレーブ30は、図1にて示すように、送信部301、受信部302、処理部303、切替部304及び制御部305から構成されている。
送信部301及び受信部302のそれぞれは、マスタ20が有する送信部201及び受信部202と同様に、図1にて示すように、バッファ310、311を有している。
制御部305は、CPUやメモリなどから構成され、マスタ20が有する制御部205と同様にデータ通信の状態を監視しながら通信の制御を行うものであり、図1にて示すように、通信応答部320、通信方式選択部321、優先フラグ記憶部322を含んでいる。
ここでは、通信応答部320について説明する。
先ず通信の初期化に係る動作について説明する。
通信応答部320は、上記の通信初期化にて、データ通信に必要な制御情報を共有した後、マスタ20から受信部302及び処理部303を介して、要求信号60を受け取ると、応答信号70を生成する。このとき、通信応答部320は、受け取った要求信号60のエラーチェックを行い、エラーが検出された場合には通信可否701に値“1”を設定し、エラーが検出されない場合には通信可否701に値“0”を設定する。また、通信応答部320は、通信要求部220による決定方法と同一の方法によりマスタ20へ通知すべき通信方式を決定する。
通信方式選択部321は、マスタ20の通信方式選択部221と同様であるので、ここでの説明は省略する。
優先フラグ記憶部322は、図5(a)にて示すように、自装置とマスタ20との間で共有する優先フラグ330を記憶するための領域を有しており、通信の初期化時に優先フラグ330が当該領域に格納される。なお、優先フラグ330の設定は、上述したように通信応答部320にて行われる。
処理部303は、マスタ20へ送信すべきデータ(マスタ20が読み出すべきデータ)に対する処理を施して、パケット単位のパケット信号を生成して送信部301を介してマスタ20へ送信する。
切替部304は、通信方式選択部221にて選択された通信方式、つまりデータ送受信時の通信モードが全二重通信か半二重通信かに応じて通信路400、401の方向の切り替え、及び送信部301、受信部302との接続の切り替えを行う。
ここでは、通信方式の切り替えについて、説明する。
(1)データ通信システム10の動作概要
ここでは、データ通信システム10の動作概要について、図10にて示す流れ図を用いて説明する。
ここでは、データ通信時のおけるマスタ20の動作について、図11にて示す流れ図を用いて説明する。
ここでは、図11にて示すステップS105の通信要求の処理動作について、図12にて示す流れ図を用いて説明する。
ここでは、図12にて示すステップS200の通信方式の設定の処理動作について、図13にて示す流れ図を用いて説明する。
ここでは、図11のステップS115にて示す通信方式の選択の処理について、図14にて示す流れ図を用いて説明する。
ここでは、データ通信時のおけるスレーブ30の動作について、図15にて示す流れ図を用いて説明する。
ここでは、図15にて示すステップS410の通信応答の処理動作について、図16にて示す流れ図を用いて説明する。
ここでは、通信方式の切り替えについて、図17にて示す流れ図を用いて説明する。なお、マスタ20とスレーブ30とは制御情報を既に共有しているものとする。
なお、本発明を上記実施の形態に基づいて説明してきたが、本発明は、上記の実施の形態に限定されないのはもちろんである。以下のような場合も本発明に含まれる。
(1)本発明は、複数の通信装置が全二重通信と半二重通信が可能な複数の通信路を介して接続され、それら通信装置間がマスタとスレーブの関係で要求信号と応答信号のハンドシェークを行ってからデータ通信を行う通信システムであって、マスタとなる通信装置は、データ通信を行う通信モードが全二重通信か半二重通信かを示す通信モードフラグを含む要求信号を出力する通信要求手段を備え、前記要求信号を受けてスレーブとなる通信装置は、データ通信を行う通信モードが全二重通信か半二重通信かを示す通信モードフラグを含む応答信号を出力する通信応答手段を備え、前記マスタとなる通信装置およびスレーブとなる通信装置のいずれについても、前記要求信号と前記応答信号の双方の通信モードフラグに応じて通信モードを選択する通信モード選択手段と、前記複数の通信路を前記通信モード選択手段で選択された通信モードに切替えた後にデータ通信を行うデータ通信手段とを備えることを特徴とする。
20 通信装置(マスタ)
30 通信装置(スレーブ)
40 通信経路
201 送信部
202 受信部
203 処理部
204 切替部
205 制御部
301 送信部
302 受信部
303 処理部
304 切替部
305 制御部
400、401 通信路
Claims (16)
- 全二重通信が可能な第1装置と第2装置とからなり、前記第1装置と前記第2装置とを接続する通信路を用いて全二重通信及び半二重通信の何れかの通信方式を選択してデータ通信を行うデータ通信システムであって、
前記第1装置は、
自装置の通信処理能力に応じて半二重通信を指定するか否かを示す第1通信フラグを含む要求信号を生成し、前記通信路を介して前記第2装置へ送出する通信要求手段と、
前記要求信号の送出後、半二重通信を指定するか否かを示す第2通信フラグを含む、前記要求信号に対する応答信号を前記第2装置から受け取り、前記第1通信フラグ及び前記第2通信フラグに基づいて、前記第2装置との間で互いに予め定められた手順により、全二重通信及び半二重通信のうち双方の通信処理能力に応じた通信方式を選択する第1選択手段と、
選択された通信方式にてデータ通信を行う第1通信手段とを備え、
前記第2装置は、
前記要求信号を受け取ると、当該第2装置の通信処理能力に基づいた前記第2通信フラグを含む前記応答信号を生成し、前記通信路を介して前記第1装置へ送出する通信応答手段と、
前記第1通信フラグ及び前記第2通信フラグに基づいて、前記手順により、全二重通信及び半二重通信のうち双方の通信処理能力に応じた通信方式を選択する第2選択手段と、
選択された通信方式にてデータ通信を行う第2通信手段とを備える
ことを特徴とするデータ通信システム。 - 前記通信要求手段は、
前記要求信号の生成に先立って、前記第2装置における通信処理能力に係る情報を受け取り、受け取った情報が示す通信処理能力と自装置の通信処理能力とを用いて前記第1装置及び前記第2装置の何れかの装置を示す優先フラグを生成し、生成した前記優先フラグを所定の第1記憶領域へ記憶するとともに、前記第2装置へ送信し、
前記通信応答手段は、
前記優先フラグを受け取ると、受け取った前記優先フラグを所定の第2記憶領域へ記憶し、
前記手順は、
前記第1通信フラグと前記第2通信フラグとが示す内容が同一であるか否かを判断し、
同一であると判断する場合には、当該内容に基づく通信方式を選択し、
同一でないと判断する場合には、前記第1選択手段においては前記第1記録領域にて記憶されている優先フラグ、前記第2選択手段においては前記第2記録領域にて記憶されている優先フラグに基づいて、通信フラグが示す優先すべき装置が指定する通信方式を選択することを含む
ことを特徴とする請求項1に記載のデータ通信システム。 - 前記通信処理能力には、データの受信に用いられるバッファの容量が含まれ、
前記要求信号には、当該第1装置がデータ送信を要求する旨及びデータを受信する旨の通信種別が含まれ、
前記通信要求手段は、
前記第1装置及び前記第2装置双方のバッファの容量が、半二重通信の通信帯域で送信されるデータのデータ量を確保できるか否かを判断し、判断結果が肯定的である場合にはデータを送信する側の装置を示す優先フラグを生成し、判断結果が否定的である場合にはデータを受信する側の装置を示す優先フラグを生成し、
前記第1選択手段及び前記第2選択手段は、
優先フラグがデータを送信する側の装置を示す内容である場合には、前記通信種別に基づいてデータ送信側となる装置が送信した信号に含まれる通信フラグが示す通信方式を選択し、優先フラグがデータを受信する側の装置を示す内容である場合には、前記通信種別に基づいてデータ受信側となる装置が送信した信号に含まれる通信フラグが示す通信方式を選択する
ことを特徴とする請求項2に記載のデータ通信システム。 - 前記通信要求手段は、
受け取った情報が示す通信処理能力と自装置の通信処理能力と比較し、比較結果により通信処理能力が劣ると判断された装置を示す優先フラグを生成し、
前記第1選択手段及び前記第2選択手段は、
優先フラグが前記第1装置を示す場合には前記第1通信フラグが示す通信方式を選択し、優先フラグが前記第2装置を示す場合には前記第2通信フラグが示す通信方式を選択する
ことを特徴とする請求項2に記載のデータ通信システム。 - 前記通信要求手段は、
前記要求信号の生成に先立って、前記第2装置における通信処理能力に係る情報を受け取り、受け取った情報が示す通信処理能力と自装置の通信処理能力のどちらか一方が半二重通信による通信処理能力を満たさない場合には全二重通信を優先とする旨、双方の通信処理能力が半二重通信による通信処理能力を満たす場合には半二重通信を優先とする旨を示す優先フラグを所定の第1記憶領域へ記憶するとともに、前記第2装置へ送信し、
前記通信応答手段は、
前記優先フラグを受け取ると、受け取った前記優先フラグを所定の第2記憶領域へ記憶し、
前記手順は、
前記第1通信フラグと前記第2通信フラグとが示す内容が同一であるか否かを判断し、
同一であると判断する場合には、当該内容に基づく通信方式を選択し、
同一でないと判断する場合には、前記第1選択手段においては前記第1記憶領域にて記憶されている優先フラグ、前記第2選択手段においては前記第2記憶領域にて記憶されている優先フラグに基づいて、優先すべき通信方式を選択することを含む
ことを特徴とする請求項1に記載のデータ通信システム。 - 前記第1通信フラグは、半二重通信による通信を指定する旨、全二重通信による通信を指定する旨及び全二重通信及び半二重通信のどちらの通信でもよい旨の何れかを示し、
前記通信応答手段は、
前記要求信号に含まれる前記第1通信フラグが全二重通信及び半二重通信のどちらの通信でもよい旨を示す場合には、前記全二重通信による通信を指定する旨及び半二重通信による通信を指定する旨の何れかを示す第2通信フラグを前記応答信号に含め、
前記手順は、
前記第1通信フラグが全二重通信及び半二重通信のどちらの通信でもよい旨を示す場合には、前記第2通信フラグが示す通信方式を選択することを含む
ことを特徴とする請求項1に記載のデータ通信システム。 - 前記第1通信フラグは、半二重通信による通信を指定する旨及び全二重通信による通信を指定する旨の何れかを示し、
前記第2通信フラグは、半二重通信による通信を指定する旨、全二重通信による通信を指定する旨及び全二重通信及び半二重通信のどちらの通信でもよい旨の何れかを示し、
前記手順は、
前記第2通信フラグが全二重通信及び半二重通信のどちらの通信でもよい旨を示す場合には、前記第1通信フラグが示す通信方式を選択することを含む
ことを特徴とする請求項1に記載のデータ通信システム。 - 前記通信要求手段は、
自装置の通信処理能力に応じた第1通信フラグを前記要求信号に含めるに先立って、データ通信の対象となるデータのデータサイズが所定サイズ以上であるか否かを判断し、所定サイズより小さいと判断する場合には、半二重通信を指定しない旨の第1通信フラグを前記要求信号に含め、所定サイズ以上であると判断する場合には、自装置の通信処理能力に応じた第1通信フラグを前記要求信号に含め、
前記通信応答手段は、
自装置の通信処理能力に応じた第2通信フラグを前記要求信号に含めるに先立って、前記データ通信の対象となるデータのデータサイズが前記所定サイズ以上であるか否かを判断し、所定サイズより小さいと判断する場合には、半二重通信を指定しない旨の第2通信フラグを前記応答信号に含め、所定サイズ以上であると判断する場合には、自装置の通信処理能力に応じた第2通信フラグを前記要求信号に含める
ことを特徴とする請求項1に記載のデータ通信システム。 - 全二重通信が可能な他装置へデータ通信の要求を行い、前記他装置との間で接続された通信路を用いて全二重通信及び半二重通信の何れかを選択してデータ通信を行うデータ通信要求装置であって、
自装置の通信処理能力に応じた通信方式として半二重通信の利用を指定するか否かを示す第1通信フラグを含む要求信号を生成し、前記通信路を介して前記他装置へ送出する通信要求手段と、
前記要求信号の送出後、前記他装置の通信処理能力に基づいた通信方式として半二重通信の利用を指定するか否かを示す第2通信フラグを含む、前記要求信号に対する応答信号を前記他装置から受け取り、前記第1通信フラグ及び前記第2通信フラグに基づいて、前記他装置との間で互いに予め定められた手順により、全二重通信及び半二重通信のうち双方の通信処理能力に応じた通信方式を選択する選択手段と、
選択された通信方式にてデータ通信を行う通信手段とを備える
ことを特徴とするデータ通信要求装置。 - 前記通信要求手段は、
前記要求信号の生成に先立って、前記他装置における通信処理能力に係る情報を受け取り、受け取った情報が示す通信処理能力と自装置の通信処理能力と比較し、比較結果により通信処理能力が劣ると判断された装置が指定する通信フラグを優先すべきとする旨の優先フラグを、前記他装置と共有するために前記所定の記憶領域へ記憶するとともに、前記他装置へ送信し、
前記手順は、
前記第1通信フラグと前記第2通信フラグとが示す内容が同一であるか否かを判断し、
同一であると判断する場合には、当該内容に基づく通信方式を選択し、
同一でないと判断する場合には、前記選択手段においては前記記憶領域にて記憶されている優先フラグに基づいて、通信フラグが示す優先すべき装置が指定する通信方式を選択することを含む
ことを特徴とする請求項9に記載のデータ通信要求装置。 - 前記データ通信において、前記通信路を用いて複数回のデータの送受信が行われ、
データの送受信毎に、要求信号の生成及び送出がなされ、
前記通信要求手段は、
2回目以降のデータの送受信に対する要求信号の生成時において、自装置における現在の通信処理能力と前記他装置の処理能力とを比較し、比較結果に応じて前記第1記憶領域にて記憶している優先フラグを更新するとともに、更新後に対する優先フラグを含む要求信号を生成して、前記他装置へ送出する
ことを特徴とする請求項10に記載のデータ通信要求装置。 - 全二重通信が可能な他装置からデータ通信の要求を受け付け、当該他装置との間で接続された通信路を用いて全二重通信及び半二重通信のうち何れかを選択してデータ通信を行うデータ通信応答装置であって、
前記他装置の通信処理能力に応じた通信方式として半二重通信を指定するか否かを示す第1通信フラグを含む要求信号を前記他装置から受け取ると、自装置の通信処理能力に基づいた通信方式として半二重通信を指定するか否かを示す第2通信フラグを含む前記応答信号を生成し、前記通信路を介して前記他装置へ送出する通信応答手段と、
前記第1通信フラグ及び前記第2通信フラグに基づいて、前記他装置との間で互いに予め定められた手順により、全二重通信及び半二重通信のうち双方の通信処理能力に応じた通信方式を選択する選択手段と、
選択された通信方式にてデータ通信を行う通信手段とを備える
ことを特徴とするデータ通信応答装置。 - 前記通信応答手段は、
前記要求信号の受け取りに先立って、当該データ通信応答装置と前記他装置とのうち通信処理能力が劣る装置が指定する通信フラグを優先すべきとする旨の優先フラグを受け取ると、受け取った前記優先フラグを所定の記憶領域へ記憶し、
前記手順は、
前記第1通信フラグと前記第2通信フラグとが示す内容が同一であるか否かを判断し、
同一であると判断する場合には、当該内容に基づく通信方式を選択し、
同一でないと判断する場合には、前記記憶領域にて記憶している優先フラグに基づいて、通信フラグが示す優先すべき装置が指定する通信方式を選択することを含む
ことを特徴とする請求項12に記載のデータ通信応答装置。 - 前記データ通信において、前記通信路を用いて複数回のデータの送受信が行われ、
データの送受信毎に、前記他装置から要求信号の送出がなされ、
前記通信応答手段は、
前記データ通信の開始に先立って、前記他装置における通信処理能力に係る情報を受け取り、記憶し、
2回目以降のデータの送受信における要求信号に対する応答信号の生成時において、自装置における現在の通信処理能力と前記他装置の処理能力とを比較し、比較結果に応じて前記記憶領域にて記憶している優先フラグを更新するとともに、更新後に対する優先フラグを含む応答信号を生成して、前記他装置へ送出する
ことを特徴とする請求項13に記載のデータ通信応答装置。 - 前記通信路は2本のシリアル通信路から形成されており、
前記他装置は、データ通信に用いられる少なくとも2つの第1端子及び第2端子を備えており、
前記データ通信応答装置は、
データ通信に用いられる少なくとも2つの第3端子及び第4端子を有し、前記他装置と着脱可能であり、前記他装置への装着時に前記第1端子と前記第3端子とが、前記第2端子と前記第4端子とがそれぞれ接続されることで前記2本のシリアル通信路を形成するメモリカード又はI/Oカードである
ことを特徴とする請求項12に記載のデータ通信応答装置。 - 全二重通信が可能な第1装置と第2装置とからなり、前記第1装置と前記第2装置とを接続する通信路を用いて全二重通信及び半二重通信の何れかの通信方式を選択してデータ通信を行うデータ通信システムで用いられる通信方法であって、
前記第1装置は、
自装置の通信処理能力に応じて半二重通信を指定するか否かを示す第1通信フラグを含む要求信号を生成し、前記通信路を介して前記第2装置へ送出し、
前記要求信号の送出後、半二重通信を指定するか否かを示す第2通信フラグを含む、前記要求信号に対する応答信号を前記第2装置から受け取り、前記第1通信フラグ及び前記第2通信フラグに基づいて、前記第2装置との間で互いに予め定められた手順により、全二重通信及び半二重通信のうち双方の通信処理能力に応じた通信方式を選択し、
選択された通信方式にてデータ通信を行い、
前記第2装置は、
前記要求信号を受け取ると、当該第2装置の通信処理能力に基づいた前記第2通信フラグを含む前記応答信号を生成し、前記通信路を介して前記第1装置へ送出し、
前記第1通信フラグ及び前記第2通信フラグに基づいて、前記手順により、全二重通信及び半二重通信のうち双方の通信処理能力に応じた通信方式を選択し、
選択された通信方式にてデータ通信を行う
ことを特徴とする通信方法。
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Also Published As
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US20100142418A1 (en) | 2010-06-10 |
CN101785279A (zh) | 2010-07-21 |
JPWO2009147785A1 (ja) | 2011-10-20 |
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