JPH07111508A - Transmitting/receiving device - Google Patents

Abstract

PURPOSE:To attain the communication in consciousness of only a logical address and to simplify the application of a network where the logical address of each transmitting/receiving device changes in accordance with its connection state. CONSTITUTION:A 1st logical address selected by a user at a logical address selecting part 305 is stored in an address register 306. The physical address data is produced at a physical address retrieving part 304 and transmitted through a network output part 303 in a packet form. This physical address retrieving packet includes a 1st physical address, the 1st logical address and a 2nd logical address. When a physical address retrieving packet is received from another transmitting/receiving device, it is detected whether the 2nd logical address included in the received packet is coincident with the logical address of the transmitting/receiving device. If the coincidence is confirmed between both physical addresses, the physical address answer data is generated at a physical address answering part 308 and transmitted through the part 303 in a packet form.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter / receiver for transmitting data using a network.

[0002]

2. Description of the Related Art With the improvement of LSI technology, networks for digitizing and transmitting video information and audio information are being developed. Since video signals and audio signals need to be reproduced in real time, a network capable of real-time transmission is required.

A network called P1394 has been proposed as a network suitable for such real-time transmission ("High Performance Serial Bus", P1394 / Dra).
ft 6.2v0, June 1,1993, IEEE). P1394 is a serial high-speed bus system, which can transmit data synchronously, and therefore can transmit in real time.

[0004]

The following problems occur when configuring a network of video signals and the like using P1394. (1) The physical address of the transmitter / receiver connected to P1394 is automatically determined by the connection status, the timing of turning on the power, and the like. Therefore, when a transmitting / receiving device is added, the physical address of the transmitting / receiving device connected until then is changed. In addition, the physical address may change each time the power is turned on.

Therefore, it is difficult for a user who uses the transmitting / receiving device to know the correspondence between each transmitting / receiving device and its physical address. That is, the logical address that can be detected by the user from the appearance of the transmitting / receiving device does not match the actual physical address. Further, even when communicating with another transmitting / receiving device, it is difficult to perform communication because the physical address of the transmitting / receiving device of the other party is not known. (2) Although there is a D2B standard for controlling a video signal and an audio signal in an analog signal state, in the D2B standard, a physical address is equal to a logical address unique to the device. For this reason, P2394 is used to convert D2B
When using, the mismatch between the physical address and the logical address becomes a problem.

It is an object of the present invention to solve the problem of the transmitting / receiving device in the network in which the logical address and the physical address do not match.

[0007]

According to a first aspect of the present invention, there is provided a transmission / reception device for a network, wherein a physical address of each transmission / reception device in the network is automatically determined when power is turned on or when the connection of the transmission / reception device is changed. A transmitter / receiver having a logical address selection unit for selecting the logical address of each transmitter / receiver and transmitting a packet when communicating with the transmitter / receiver having a certain logical address after the physical address of each transmitter / receiver is determined The physical address and the logical address are the first physical address and the first logical address, respectively, and the physical address and the logical address of the transmitting / receiving device that should receive the packet are the second physical address and the second logical address, respectively. Of the other party who wants the transceiver to communicate with the first physical address and the first logical address A physical address search packet transmitting means for arranging and transmitting a logical address of a receiving device as a second logical address in a physical address search packet; and a physical address search packet within the physical address search packet when the physical address search packet is received from another transmitting / receiving device. Physical address reply packet sending means for sending back the received physical address of the sending / receiving device as a physical address reply packet within a predetermined period when the second logical address arranged in the same is equal to the received logical address of the sending / receiving device. A logic for determining that the transceiver having the second logical address does not exist on the network when the physical address reply packet is not transmitted from another transceiver within a predetermined period after transmitting the physical address search packet. Address loss detection means, and the physical address And performing communication using the physical address of the mutual transmission and reception device revealed by the search packet or a physical address reply packet.

The transmitter / receiver of the second invention is a logical address of each transmitter / receiver for a network in which the physical address of each transmitter / receiver in the network is automatically determined when the power is turned on or when the connection of the transmitter / receiver is changed. And a physical address of each transmitting / receiving device is determined after the physical address of each transmitting / receiving device is determined, the physical address and the logical address of the transmitting / receiving device transmitting the packet are set. First each
A physical address and a first logical address, a physical address and a logical address of a transmitting / receiving device that should receive the packet are set as a second physical address and a second logical address, respectively, and all the transmitting / receiving devices in the network have the first physical address and the first physical address. When receiving a physical address search packet from another transmission / reception device, and a physical address search packet transmission means for arranging and transmitting the logical address of the transmission / reception device to communicate with one logical address as the second logical address in the physical address search packet. When the second logical address arranged in the physical address search packet is equal to the received logical address of the transmitting / receiving device, the received physical address of the transmitting / receiving device is returned as a physical address reply packet within a predetermined period. Send physical address reply packet And a logical address selection error detection means for detecting a logical address selection error of the transmission / reception devices connected to the network, and the mutual transmission / reception devices of the mutual transmission / reception devices revealed by the physical address search packet or the physical address response packet. The feature is that communication is performed using a physical address.

According to a third aspect of the present invention, there is provided a transmitting / receiving apparatus for a network in which the physical address of each transmitting / receiving apparatus in the network is automatically determined when the power is turned on or when the connection of the transmitting / receiving apparatus is changed. When transmitting the address of the transmitting / receiving device on the transmitting side or the address of the transmitting / receiving device on the receiving side between the transmitting / receiving device and the logical address selecting means for selecting the physical address and the logical address at the same time. And an address transmission means for performing the same.

[0010]

According to the present invention, according to the present invention, when it is desired to communicate with a transmitter / receiver having a certain logical address, the logical address (second logical address) of the partner transmitter / receiver and the physical address of the own transmitter / receiver are first set. The (first physical address) and the logical address (first logical address) are transmitted to all transmission / reception devices using the physical address search packet. On the other hand, the transmitter / receiver having the same logical address as the second logical address shown in the physical address search packet returns the physical address of the transmitter / receiver as a physical address reply packet. As a result, both transmitting and receiving devices can know the relationship between the physical address and the logical address of each other, so that it becomes possible to directly perform the subsequent communication using the physical address.

Further, by automatically executing the physical address transmission by the physical address search packet and the physical address reply packet, the user can carry out the communication conscious of only the logical address without being conscious of the physical address.

In the first aspect of the invention, when the physical address reply packet is not returned within a certain period after transmitting the physical address search packet, there is a transmitting / receiving device having a logical address to be communicated on the network. Decide not to. This allows the user to detect a network connection error or the like.

In the second invention, a logical address setting error is detected by a physical address reply packet or the like received from another transmitting / receiving device after transmitting the above physical address search packet.

Specifically, when the second logical address transmitted by the physical address search packet is defined by two or more different transmitting / receiving devices, or the first logical address is defined by two or more different transmitting / receiving devices. Can be detected.

According to the third aspect of the present invention, both the physical address and the logical address are arranged in a packet and transmitted at the time of executing communication. As a result, in connection with a device such as D2B that uses only a logical address, the transmitted logical address can be used as the D2B address as it is. This facilitates connection with a network whose logical address and physical address match.

[0016]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 shows an example of a network using the transmitting / receiving apparatus of the present invention. In FIG. 1, 101 is a transmission / reception device connected to a first video monitor, 102 is a transmission / reception device connected to a first audio amplifier, 103 is a transmission / reception device connected to a first audio disc player,
104 is the first video cassette recorder, 105 is the first
Video disc player 106 is a second video cassette recorder.

As shown in FIG. 1, on the network described in the present embodiment, the transmission / reception devices are connected in a tree shape.
The logical address of each transmitting / receiving device is determined by the function of the device connected to the transmitting / receiving device.

FIG. 2 shows an example of the logical address used in the present invention. The logical address is composed of a device type indicating the function of the connected device and a device number.
As shown in FIG. 2, the device types are classified into names such as video monitors and audio amplifiers that the user can easily understand from the appearance of the device. Since such a device type can be determined at the manufacturing stage of each device, the user does not need to change it.

Next, as for the device number, when there are a plurality of transmitting / receiving devices having the same device number on the network, each transmitting / receiving device selects a different device number. If the device types are different, transmission / reception devices having the same device number may exist. The device number can be selected by a switch or the like so that the user can easily understand when the user configures the network.

As described above, the logical address of each transmission / reception device is determined without duplication by the combination of the device type and the device number. Moreover, each logical address can be easily judged from the appearance by the user who uses the network.

The number of types of device type is determined by the number of bits assigned to the device type, but it is possible to define a service code to extend the device type. The service code is a concept further above the device type, and by switching the service code, it becomes possible to newly define another set of device types.

A block diagram of the first embodiment of the transmitting / receiving apparatus having the above logical address is shown in FIG. In FIG. 3, 301 is a command input unit, 302 is a packet generation unit, 303 is a network output unit, 304 is a physical address search unit, 305 is a logical address selection unit, and 306.
Is an address register, 307 is a logical address loss detection unit, 308 is a physical address response unit, 309 is a command output unit, 310 is a packet decoding unit, and 311 is a network input unit.

The operation of the embodiment shown in FIG. 3 will be described below. When a user transmits a command or data using the transmission / reception device, the command or data is input from the command input unit 301, packetized by the packet generation unit 302, and output to the network from the network output unit 303. The packet input from the network input unit 311 is decoded into data or a command by the packet decoding unit 310 and output from the command output unit 309.

Next, the handling of the address of the transmitting / receiving device used at the time of packet generation and packet decoding will be described.
First, the logical address (first logical address) of the own transmission / reception device is selected by the user in the logical address selection unit 305 using the switch or the like as described above. The selected first logical address is stored in the address register 306. Further, the physical address (first physical address) of its own transmitting / receiving device is automatically determined on the network, and the address is also stored in the address register 306.

When transmitting data or a command via the network, the physical address (second physical address) of the transmission / reception device of the transmission partner is required. A method of obtaining this second physical address will be described below. (1) Physical address search data is generated by the physical address search unit 304, packetized by the packet generation unit 302 (physical address search packetization), and output from the network output unit 303. The first physical address, the first logical address, and the second logical address are arranged in the physical address search packet. Also, the physical address search packet is transmitted to all other transmitting / receiving devices by broadcast communication or the like. (2) The packet input from the network input unit 311 is decoded by the packet decoding unit 310. At this time,
When a physical address search packet is received from another transmitting / receiving device, it is detected whether or not the second logical address arranged in the packet matches the received logical address of the transmitting / receiving device. If they match, the physical address reply unit 308 generates physical address reply data, and the packet generation unit 302 packetizes (physical address reply packet) and outputs from the network output unit 303. The first physical address (the second physical address for the transmitting / receiving device that has transmitted the physical address search packet) is placed in the physical address reply packet. It is also possible to arrange the first logical address, the second logical address, etc. in the physical address reply packet.

The transmitting / receiving device that has transmitted the physical address search packet as described in (1) and (2) returns the physical address (second physical address) of the transmitting / receiving device having the logical address to be communicated with. It becomes possible to know by. The second physical address obtained here is stored in the address register 306, and it is possible to know the physical address by searching the address register 306 in communication thereafter.

Further, the physical address in the address register 306 is set to the above when the network is reset and the physical address of each transmitting / receiving device is changed, or when communicating with a transmitting / receiving device different from the transmitting / receiving device which has been communicating so far. Will be updated in the way. However, the address register 306
When the capacity is large, it becomes possible to store the physical addresses of a plurality of other transmission / reception devices. In this case,
Even if the transmitting / receiving device for communication is switched, the previous physical address can be further stored in the address register 306.

Next, the logical address loss detection unit 30 of FIG.
The operation of No. 7 will be described. The logical address loss detection unit 307 detects whether or not the physical address reply packet is returned within a fixed period after transmitting the physical address search packet. Here, when the physical address reply packet is not returned within the fixed period, it becomes clear that the transmission / reception device having the second logical address does not exist on the network. Therefore, a logical address setting error or a network connection error can be detected.

Next, a block diagram of the second embodiment of the present invention will be described with reference to FIG. In FIG. 4, 301 to 31
1 is the same component as that of the first embodiment shown in FIG. 3, and its operation is almost the same as that of the first embodiment. Reference numeral 407 in FIG. 4 is a logical address selection error detection unit.

Here, points different from the first embodiment will be described. In this embodiment, the logical address selection error detection unit 4
At 07, a selection error of the logical address of the transmission / reception device connected to the network is detected. A first example of the logical address selection error detection unit 407 will be described with reference to FIG.

In FIG. 5, reference numeral 501 is a physical address reply packet input unit, and 502 is a multiple logical address detection unit. After transmitting the physical address search packet, a physical address reply packet received from another transmission / reception device within a fixed period is input to the multiple logical address detection unit 502 via the physical address reply packet input unit 501. The multiplex logical address detection unit 502 detects whether or not physical address reply packets have been received from a plurality of different transmission / reception devices within the above-mentioned fixed period. If physical address reply packets are received from a plurality of transceivers, the plurality of transceivers have the same logical address (logical address 2). In this way, a logical address setting error can be detected and notified to the user.

Next, a second example of the logical address selection error detection unit 407 will be described with reference to FIG. In FIG. 6, 6
Reference numeral 01 is a physical address search packet input unit, and 602 is a sender logical address detection unit. When a physical address search packet is input from the other transmission / reception device from the physical address search packet input unit 601, the first logical address (the logical address of the sender who transmitted the physical address search packet) in the packet is sent to the sender logical address. Detection unit 602
To enter.

The sender logical address detection unit 602 compares the input logical address of the sender with the logical address of its own transmitter / receiver. Here, when the logical addresses of the two are the same, it can be detected that the logical addresses of these two transmitting / receiving devices are the same. In this way, it becomes possible to detect the setting error of the logical address and notify the user also by the example of FIG.

Next, a third embodiment of the present invention will be described with reference to FIG. In FIG. 7, 701 is a logical address input unit, 702 is a physical address output unit, 703 is a packet generation unit, and 704 is a network output unit.

The third embodiment relates to the address placed in the packet. From the logical address input unit 701, the logical address (logical address 2) of the other party to which the packet is transmitted is input. The input logical address 2 is input to the physical address output unit 702, and the physical address 2 corresponding to the logical address 2 is output there. The physical address 2 and the logical address 2 thus obtained are
Both are input to the packet generation unit 703, arranged in the packet, and output from the network output unit 704. It is also possible to further arrange the physical address 1 and the logical address 1 in the packet.

With the configuration as shown in FIG. 7, both the logical address and the physical address are arranged in the packet. Therefore, when the present network is connected to the second network in which the logical address and the physical address match, the logical address in the packet can be used as it is as the physical address of the second network.

Therefore, when a network such as D2B in which a logical address and a physical address match and a network using the transmitting / receiving apparatus of the present invention are used at the same time, the logical address used in the transmitting / receiving apparatus of the present invention is D2B.
Matching the logical address used for makes connection of both networks much easier.

Although the present invention has been described with reference to the three embodiments, the actual circuit configuration can be other than the embodiments, and can be realized by software. Further, a configuration in which a part or all of the technique of the above-described embodiment is applied is also possible.

[0040]

As described above, the transmitting / receiving device of the present invention is
Since it is possible to know the relationship between the physical address and the logical address of both of the transmitting and receiving devices that perform communication, it becomes possible to directly perform the subsequent communication using the physical address.

Further, by automatically executing the physical address transmission by the physical address search packet and the physical address reply packet, the user can carry out the communication conscious of only the logical address without being conscious of the physical address.

Further, according to the first invention, it becomes possible to detect an erroneous connection of the network, a disconnection or the like.

In the second invention, it is possible to detect that a plurality of different transmitting / receiving devices have the same logical address.

In the third invention, it becomes possible to easily connect the network used in the transmitting / receiving apparatus of the present invention to another network.

As described above, in the transmitting / receiving device of the present invention,
Since the logical address and the physical address can be associated with each other by a simple method, its practical effect is very large.

[Brief description of drawings]

FIG. 1 is a block diagram of an example of a network to which a transmission / reception device of the present invention is connected.

FIG. 2 shows an example of a logical address of the transmitter / receiver of the present invention.

FIG. 3 is a block diagram of an embodiment of a transmission / reception device of the first invention.

FIG. 4 is a block diagram of an embodiment of a transmission / reception device of the second invention.

FIG. 5 is a block diagram of a first example of a logical address selection error detection unit.

FIG. 6 is a block diagram of a second example of a logical address selection error detection unit.

FIG. 7 is a block diagram of an embodiment of a transmitting / receiving device of the third invention.

[Explanation of symbols]

 304 physical address search unit 305 logical address selection unit 306 address register 307 logical address loss detection unit 308 physical address response unit 407 logical address selection error detection unit 502 multiple logical address detection unit 602 sender logical address detection unit

Claims (7)

[Claims] 1. A logical address selecting means for selecting a logical address of each transmitting / receiving device for a network in which a physical address of each transmitting / receiving device in the network is automatically determined when power is turned on or when the connection of the transmitting / receiving device is changed. And when communicating with a transceiver device having a certain logical address after the physical address of each transceiver device is determined,
A physical address and a logical address of a transmitting / receiving device that transmits a packet are respectively a first physical address and a first logical address, and a physical address and a logical address of a transmitting / receiving device that should receive the packet are a second physical address and a second logical address, respectively. And a physical address to be transmitted to all transmitting / receiving devices in the network by arranging the logical address of the transmitting / receiving device of the other party who wants to communicate with the first physical address and the first logical address as the second logical address in the physical address search packet. When the physical address search packet is received from the search packet transmitting means and another transmission / reception device, when the second logical address arranged in the physical address search packet is equal to the received logical address of the transmission / reception device. , The receiving and transmitting device A physical address reply packet transmitting means for returning a physical address as a physical address reply packet within a predetermined period, and the physical address reply packet transmitted from another transceiver within a predetermined period after transmitting the physical address search packet And a logical address loss detection means for determining that the transmitting / receiving device having the second logical address does not exist on the network when the physical address search packet or the physical address reply packet is not present. A transmitter / receiver characterized by performing communication using a physical address of the transmitter / receiver. 2. A logical address selecting means for selecting a logical address of each transmitter / receiver for a network in which the physical address of each transmitter / receiver in the network is automatically determined when the power is turned on or when the connection of the transmitter / receiver is changed. And when communicating with a transceiver device having a certain logical address after the physical address of each transceiver device is determined,
A physical address and a logical address of a transmitting / receiving device that transmits a packet are respectively a first physical address and a first logical address, and a physical address and a logical address of a transmitting / receiving device that should receive the packet are a second physical address and a second logical address, respectively. And a physical address to be transmitted to all transmitting / receiving devices in the network by arranging the logical address of the transmitting / receiving device of the other party who wants to communicate with the first physical address and the first logical address as the second logical address in the physical address search packet. When the physical address search packet is received from the search packet transmitting means and another transmission / reception device, when the second logical address arranged in the physical address search packet is equal to the received logical address of the transmission / reception device. , The receiving and transmitting device A physical address response packet transmitting means for returning a physical address as a physical address response packet within a predetermined period; and a logical address selection error detecting means for detecting a logical address selection error of a transmission / reception device connected to a network, A transmission / reception device, characterized in that communication is performed by using the physical addresses of the transmission / reception devices which are made clear by the physical address search packet or the physical address response packet. 3. A logical address selecting means for selecting a logical address of each transmitting / receiving device for a network in which the physical address of each transmitting / receiving device in the network is automatically determined when the power is turned on or when the connection of the transmitting / receiving device is changed. When,
When transmitting the address of the transmitting / receiving device on the transmitting side or the address of the transmitting / receiving device on the receiving side between the transmitting / receiving devices, it has an address transmitting means for transmitting both the physical address and the logical address at the same time. Transceiver. 4. The logical address selecting means expresses a logical address by a combination of a device type and a device number,
4. The device type determining means for determining the device type according to the function of the transmission / reception apparatus, and the device number selecting means for selecting the device number by a switch, claim 1, claim 2 or claim 3. The described transceiver device. 5. The transmission / reception apparatus according to claim 4, wherein the logical address selection means uses the logical address used for D2B communication as it is. 6. The logical address selection error detecting means includes a multiple logical address detecting means for detecting that a physical address reply packet is received from a plurality of different transmitting / receiving devices within a predetermined period after transmitting the logical address search packet. The transmitting / receiving apparatus according to claim 2, further comprising: 7. A sender logical address detecting means for detecting whether or not the first logical address arranged in the received logical address search packet matches the received logical address of the transmitter / receiver. The transmitter / receiver according to claim 2, further comprising: