KR20020083673A - Allocation Method For Communication Channel Of TDM Bus - Google Patents

Abstract

PURPOSE: A method for assigning a communication channel of a TDM(Time Division Multiplex) bus is provided to assign a channel necessary for communication without previously defining a time slot allocation method between a master device and a slave device by performing all controls about the time slot allocation necessary for forming the communication channel between the master device and the slave device in the master device. CONSTITUTION: A master device writes a certain time slot allocation table for assigning communication channels(CH1-CH7) with each slave device connected to it through a TDM bus(S52). The master device transmits a message including the corresponding time slot allocation table to the slave devices through a maintenance channel(CH0)(S53). Each of slave devices receives the time slot allocation table transmitted through the maintenance channel(CH0), and fetches time slot allocation information identical to its slave device number, i.e., fetches a start time slot number and time slot number information(S54). Each of slave devices re-initializes a TDM bus matching function on the basis of fetched time slot allocation information, and assigning the communication channels(CH1-CH7) with the master device for performing a normal communication between the corresponding master device and the slave devices(S55).

Description

Allocation Method For Communication Channel Of TDM Bus

The present invention relates to a communication channel allocation method of a time division multiplex (TDM) bus. In particular, a communication channel on a TDM bus to which one master device and a plurality of slave devices are connected is a start time slot number which is information of a time slot assignment of a master device. And a communication channel allocation method of a TDM bus that can be variably allocated according to the number of timeslots.

In general, in performing communication, multiplexing is performed as a method for transmitting data (information) more efficiently without any change. Such multiplexing methods include time division multiplexing and frequency division multiplexing.

Here, when time division multiplexing is applied to communication between one master device and a plurality of slave devices, as illustrated in FIG. 1, one master device 10 and a plurality of slave devices 20 to 26 ( For convenience of description, in FIG. 1, seven slave devices are limited, but more or less) may be connected to one time division multiplex (TDM) bus.

At this time, the signals constituting the TDM bus include a transmission data signal TXD, a reception data signal RXD, a clock signal CLK, and a synchronization signal SYNC. The transmission data signal TXD is a master. The device 10 transmits data to each slave device 20 to 26, and the corresponding received data signal RXD is a signal to transmit data from each slave device 20 to 26 to the master device 10. . The clock signal CLK is a synchronization clock for the transmission and reception data signals TXD and RXD, and the synchronization signal SYNC is a start synchronization signal indicating the start of a TDM frame on the TDM bus.

In addition, when the timing signal of the corresponding TDM bus is described with reference to the example of FIG. 2, one TDM frame includes 32 time slots and one time slot consists of 8 bits. Consists of 256 bits. That is, the period of the synchronization signal SYNC representing one TDM frame has 256 clock intervals.

In addition, a channel CH0 to CH6, which is a path through which the corresponding master device 10 and each slave device 20 to 26 can communicate, is a logical path that may consist of one time slot or a plurality of time slots. to be.

In such a conventional TDM bus, a fixed number that predetermines the start number and the number of timeslots assigned to the respective communication channels CH0 to CH6 before the master device 10 and the slave devices 20 to 26 are initialized. According to the timeslot allocation method, each slave device 20 to 26 allocates and uses channels CH0 to CH6 that can communicate with the master device 10. FIG. 3 shows each slave device on a conventional TDM bus. 20 to 26 show the start number and the number of timeslots of the timeslots occupied to form the communication channels CH0 to CH6 with the master device 10.

Here, the start time slot assigned to the slave device 20, '0', in order to form the communication channel CH0 between the master device 10 and the slave device 20, '0' is '0' and time. The number of slots is one, and a start time slot allocated to slave device 21 of '1' to form a communication channel CH1 between the master device 10 and the slave device 21 of '1'. Is '1' and the number of timeslots is 4, and each slave device 20 to 26 uses the slave device number assigned to each slave device 20 to 26 to know an identifier assigned to it. .

At this time, the device number is assigned to '0' slave device 20, '0', the device number is assigned to '1' slave device 21 is '1', the master device 10 is communication Since all channels CH0 to CH6 can be used at the time, no device number is assigned.

In summary, in the conventional TDM bus, each slave device reads the slave device number during the initialization (boot) process, and then masters the slave device number with its own slave device number using a predetermined time slot according to a fixed time slot assignment method. Form a channel for communication with the device.

Therefore, in the related art, a time slot assignment method should be defined in advance between a master device connected to a TDM bus and each slave device. When changing the defined time slot assignment method, all slave devices as well as changes in the master device are defined. There was also the hassle of having to make changes.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to allow the master device to perform all the control regarding the time slot assignment required to form a communication channel between the master device and the slave device connected to the TDM bus. In other words, it is possible to allocate a channel necessary for communication without predefining a time slot assignment method between a corresponding master device and a slave device.

In addition, another object of the present invention is to allow all slave devices to allocate a new communication channel according to the time slot assignment scheme changed by the master device when the communication channel allocated between the master device and the slave device is to be changed. The conventional method is to eliminate the hassle of changing the time slot allocation method of all slave devices.

1 is a diagram illustrating a TDM bus connection structure between a general master device and a plurality of slave devices.

FIG. 2 shows timing signals of a conventional TDM bus in FIG. 1; FIG.

3 is a diagram illustrating timeslot allocation states for establishing a communication channel between a master device and a slave device on a conventional TDM bus.

4 is a diagram illustrating a timeslot allocation state when a master device forms a communication channel with each slave device on a TDM bus according to the present invention.

5 is an operational flowchart for implementing a method in which a master device allocates a communication channel with each slave device on a TDM bus according to the present invention.

6 is a flowchart illustrating a time slot reassignment operation when a master device wants to change a communication channel assigned to a slave device on a TDM bus according to the present invention.

Explanation of symbols on the main parts of the drawings

10: master device 20 ~ 26: slave device

A feature of the present invention for achieving the above object is that the master device creates a predetermined timeslot assignment table necessary for allocating a communication channel with a slave device connected by a TDM bus and transmits it to the slave device through a maintenance channel. Transmitting; The present invention provides a method for allocating a communication channel of a TDM bus, including receiving the timeslot allocation table, retrieving timeslot allocation information allocated thereto, and allocating a communication channel with the master device.

The timeslot allocation table may be prepared by differently assigning timeslots necessary for allocating a communication channel with a corresponding slave device according to an amount, frequency, or importance of information transmitted and received with each slave device. And a slave device number connected to the device and the TDM bus, and start time slot number and time slot number information to be assigned to the slave device having the slave device number.

The TDM bus communication channel allocation method may further include setting a TDM bus matching function to receive a time slot assignment table transmitted through a maintenance channel from a master device upon initialization of the slave device. It is characterized by including.

The process of allocating a communication channel with the master device may include: retrieving a start time slot number and time slot number information, which are time slot assignment information corresponding to a slave device number of the received time slot assignment table; And allocating a communication channel with the master device by initializing the TDM bus matching function based on the extracted start time slot number and the number of timeslots.

Further, another feature of the present invention, the step of transmitting a time slot reassignment command to the slave device when the communication channel allocated between the master device and the slave device; Changing the time slot assignment information of the previously prepared time slot assignment table and transmitting the same to the slave device through the maintenance channel; And receiving the timeslot assignment table, retrieving timeslot reassignment information allocated to the master, and allocating a new communication channel with the master device.

The transmitting of the timeslot reassignment command to the slave device may be performed through a communication channel allocated between the master device and the slave device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, the master device is intended to control a predetermined time slot allocation scheme required to form a communication channel between one master device and a plurality of slave devices connected to the TDM bus, and for this purpose, between the master device and each slave device Since the TDM bus connection structure is the same as the general TDM bus connection structure shown in FIG. 1, the same reference numerals will be used.

However, the master device 10 and each slave device 20 to 26 applied to the embodiment of the present invention perform a different function from the conventional one for allocating a communication channel, and the master device 10 corresponds to each slave device. A predetermined time slot assignment table necessary for allocating a communication channel with 20 to 26 is prepared as shown in the example in Table 1 below, and is transmitted to the slave devices 20 to 26 through the maintenance channel. If the slot assignment is to be changed, the time slot reassignment command is transmitted through the communication channel currently connected to each slave device 20 to 26, and the pre-written time slot assignment table is changed to change the slave slot device through the maintenance channel. ~ 26).

Slave device number Start timeslot number Number of timeslots 0 One 2 One 3 4 2 7 6 3 13 6 4 19 6 5 25 5 6 30 2

Then, the slave devices 20 to 26 correspond to their own slave device numbers in the time slot assignment table transmitted from the master device 10 through the maintenance channel (start to assign to each communication channel). The number of timeslots) and the number of timeslots (number of timeslots allocated to each communication channel) are extracted to allocate a communication channel with the master device 10.

At this time, the slave device 20 to 26 must initially provide a TDM bus matching function capable of receiving a time slot assignment table transmitted from the master device 10 through the maintenance channel, and corresponding maintenance channel. Is a maintenance channel CH0 of the TDM bus allocated to timeslot '0' in the timeslot allocation structure of FIG. 4, and can be used only by the master device 10.

4 is a diagram illustrating a time slot assignment state when the master device 10 forms a communication channel with each slave device 20 to 26 on the TDM bus according to the present invention. It shows the timeslot allocation status when the communication channel is allocated according to the slot assignment table.

A method of allocating a communication channel with each slave device by a master device on a TDM bus according to the present invention having such a structure will be described in detail with reference to FIG. 5 as follows.

First, on the TDM bus of the present invention, each slave device 20 to 26 initially selects a specific channel (channel '0' in the embodiment of the present invention) CH0 set as a maintenance channel from the master device 10. The TDM bus matching function is set to receive the timeslot assignment table transmitted via the control (step S51).

In this state, the master device 10 creates a predetermined timeslot assignment table for allocating communication channels CH1 to CH7 with each slave device 20 to 26 connected to the TDM bus (step S52). The message including the timeslot allocation table is transmitted to the slave devices 20 to 26 through the channel CH0, which is the maintenance channel (step S53). At this time, the corresponding timeslot allocation table is prepared by differently assigning time slots required for allocating communication channels with the slave devices 20 to 26 according to the amount, frequency, or importance of information transmitted and received with the respective slave devices 20 to 26. It is preferable to make it.

Each slave device 20 to 26 receives a timeslot allocation table transmitted from the master device 10 through the maintenance channel CH0, and thus timeslot allocation information corresponding to its slave device number. After retrieving the starting timeslot number and timeslot number information, which is the timeslot information allocated to itself (step S54), the TDM bus matching function is reinitialized based on the retrieved timeslot allocation information and the master device 10 is re-initialized. By allocating the communication channels CH1 to CH7 (step S55), normal communication between the master device 10 and the slave devices 20 to 26 can be performed.

For example, when the timeslot assignment table created by the master device 10 is as shown in Table 1, each slave device 20 to 26 starts with a corresponding timeslot number corresponding to its slave device number in the corresponding timeslot assignment table. The number and timeslot number information is extracted to allocate the communication channels CH1 to CH7 with the master device 10. As a result, the timeslot of the TDM bus to which the master device 10 and each slave device 20 to 26 are connected. The allocation structure is as shown in FIG.

That is, in FIG. 4, channel 0 (CH0) is a maintenance channel that can be used only by the master device 10 and is used as a channel for transmitting the timeslot assignment table, and slave 0 (Slave 0). 20 assigns time slots TS1 and TS2 to its communication channel CH1 as timeslots are assigned with the starting timeslot number '1' and the timeslot number '2'. Slave device 1 (Slave 1) 21 is a time slot number '3' and a time slot number '4' according to the time slot number '3' and '6' time slots (TS3 to TS6). Is assigned to its communication channel (CH2).

Then, slave device No. 5 (Slave 5) 25 is a time slot number 25 as the starting time slot number '25' and the number of time slots '5', and thus times slots 25 to 29 are TS25 to TS29. Is assigned to its own communication channel (CH6), 'slave' (Slave 6) (6) 26 has a time slot number '30', the time slot number '2' as the time slot is assigned to '30' Time slots TS31 to TS32 of the ~ 31 'are allocated to the communication channel CH7.

Meanwhile, according to the above-described operation, communication channels CH1 to CH7 between the master device 10 and the slave devices 20 to 26 are allocated, and the master device 10 receives the slave device 20 while performing normal operation. A time slot reassignment operation when a communication channel (CH1 to CH7) allocated to ˜26) is to be changed, that is, when a time slot allocation is to be changed, will be described with reference to FIG. 6.

First, the master device 10 transmits a time slot reassignment command through a communication channel currently connected to each slave device 20 to 26 (step S61), and the slave device 20 to receive the corresponding time slot reassignment command. The 26 then reset the TDM bus matching function to receive the modified timeslot assignment table transmitted from the master device 10 via the maintenance channel CH0.

At this time, the master device 10 changes the timeslot assignment information of the existing timeslot assignment table according to the timeslot reassignment plan to be changed after transmitting the timeslot reassignment command (step S62). The time slot assignment table including the relocation information is transmitted to the slave devices 20 to 26 via the maintenance channel CH0 (step S63).

Accordingly, each slave device 20 to 26 receives the changed time slot assignment table transmitted through the maintenance channel CH0 from the master device 10, and timeslot relocation information corresponding to the slave device number of the slave device 20 to 26 is received. After retrieving the in-start timeslot number and timeslot number information (step S64), the TDM bus matching function is reinitialized based on the retrieved timeslot reassignment information and a new communication channel (CH1 to CH7) with the master device 10 is obtained. Is assigned (step S65).

In the above-described timeslot reassignment operation, the transmission of the timeslot reassignment command, the change of the timeslot assignment table, and the transfer operation may be performed in that order.

In addition, the embodiments according to the present invention are not limited to the above-described embodiments, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention is a time slot between the master device and the slave device by performing the master device performs all the control regarding the time slot assignment required to form a communication channel between the master device and the slave device connected to the TDM bus The channel required for communication can be allocated without defining the allocation method in advance.

In addition, when the time slot assignment method is changed in the master device when the communication channel allocated between the master device and the slave device is to be changed, all slave devices may allocate a new communication channel according to the changed time slot assignment method. This avoids the hassle of changing the time slot assignment method of all slave devices as in the prior art.

Claims (8)

Creating, by a master device, a predetermined time slot assignment table necessary for allocating a communication channel with a slave device connected through a TDM bus, and transmitting the predetermined time slot assignment table to the slave device through a maintenance channel; And receiving the timeslot assignment table, retrieving timeslot assignment information assigned to the mobile station, and allocating a communication channel with the master device. The method of claim 1, The timeslot allocation table may be prepared by differently assigning timeslots necessary for allocating communication channels with the corresponding slave devices according to the amount, frequency, or importance of information transmitted and received with each slave device. How to assign a communication channel. The method of claim 1, And setting a TDM bus matching function to receive a time slot assignment table transmitted through a maintenance channel from a master device at the time of initialization of the slave device. . The method of claim 1, The process of allocating a communication channel with the master device may include: retrieving a start timeslot number and timeslot number information which is timeslot allocation information corresponding to a slave device number of the received timeslot allocation table; And allocating a communication channel with the master device by initializing a TDM bus matching function based on the extracted start time slot number and the number of timeslots. Transmitting a timeslot reassignment command to the slave device when a communication channel allocated between the master device and the slave device is to be changed; Changing the time slot assignment information of the previously prepared time slot assignment table and transmitting the same to the slave device through the maintenance channel; And receiving the timeslot assignment table and retrieving the timeslot reassignment information assigned to the master, and allocating a new communication channel with the master device. The method of claim 5, And transmitting a timeslot reassignment command to the slave device through a communication channel allocated between the master device and the slave device. The method of claim 5, Resetting the TDM bus matching function to receive the changed timeslot allocation table transmitted from the master device through the maintenance channel when receiving the timeslot reassignment command. Communication channel allocation method. The method according to any one of claims 1 to 7, The time slot assignment table may include a slave device number connected to a master device and a TDM bus, and start time slot number and time slot number information to be assigned to the slave device having the slave device number. How to assign a communication channel.