SU528561A1 - Device for information exchange - Google Patents

Description

the output of the reception and output control unit, the output of the communication unit with subscribers is connected to the third input of the reception and output control unit, the first input of the communication unit with subscribers and the third input of the receiving node are connected to subscribers.

The listed blocks, together with the known ones, allow to organize the exchange between the multiplex channel and the subscribers having a different data format from the channel at a high speed. In this case, with each subscriber, the channel is exchanged in one cycle by an array equal to one machine word.

The described device is shown in the drawing, where 1 is the receiving node, 2 is the buffer register, 3 is the receiving and issuing control unit, 4 is the issuing node, 5 is the mode trigger, 6 is the communication unit with the channel, 7 is the mode analyzing unit, 8 - delivery counter, 9 - communication unit with subscribers, 10 - load register, 11 - reception counter.

The output of the receiving unit 1 is connected to the first input of the buffer register 2, the output of which is connected to the first input of the output unit 4. The first and second outputs of the output unit 4 are connected respectively to subscribers and to the input of unit 6. The outputs of unit 6 are connected to the first input of unit 7, the second the inputs of the unit 3 and the receiving unit 1, the outputs of the unit 7 are connected to the inputs of the unit 6 and the mode trigger 5. The output of the trigger mode 5 is connected to the first inputs of the unit 3 and the receiving unit 1, the third inputs of the buffer register 2 and the output node 4 and the input of the load register 10 The output of block 9 is connected to t The third input of block 3. The first, second, third, fourth, fifth, sixth and seventh outputs of block 3 are connected respectively to the second input of the buffer register 2, the second input of the output node 4, the input of block 6, the second input of the block 7, the inputs of the output counter 8 and the load register 10, the input of the reception counter 11, the third input of the block 9. The output of the reception counter 11 is connected to the input of the load register 10 and the fourth input of the buffer register 2. The output of the load register 10 is connected to the fourth input of the block 3. The output of the output counter 8 is connected to the second block 9 input, che the fourth input of the output unit 4, the input of the register, load 10 and the input of unit 6. The first input of unit 9 is connected to the third input of the receiving unit 1 and to the subscriber. Input block 6 is connected to the channel.

In general, the data formats of the multiplex channel and subscribers can be arbitrary. In order to consider the operation of the device for exchanging information, the unit of information of the channel is taken equal to the seven-bit character, and the unit of information of the subscriber is taken equal to the eight-bit character - byte. The conversion of characters to bytes and vice versa is done through buffer register 2. When inputted into buffer register 2, bytes are inserted, characters are output from it, and output is the opposite. Two characters are required to transmit one byte. If you organize a byte exchange between a channel and a subscriber, i.e., each next byte will be from another subscriber, you will need eight characters to transmit four bytes (two for each byte, the first character contains seven high byte bits, and in the second character only the most significant bit is significant, the other six always contain zeros). If during the exchange of a multiplex channel with the subscriber the communication is not interrupted by the subscriber’s issuance time of several bytes, the number of characters bytes entered into the channel will be significantly reduced (for example, five characters will be needed to enter four bytes into the channel, i.e. The time for transmitting the same data set is reduced by almost 40%. If you take into account the time during which the connection between the next subscriber and the channel is established, the time savings will be even greater. However, the array that is exchanged by the multi The multiplex channel and the subscriber during one cycle is unprofitable, since the relative multiplex channel operation time with each subscriber decreases, i.e. the multiplex channel performance decreases. Therefore, it is advisable to choose the array size such that the relative multiplex operation times with each subscriber acceptable. In addition, the use of operational cs is decisive in choosing the optimal array. If the array is less than or more than a machine word, then this leads to unproductive expenditure of RAM. Therefore, in this device, the length of the exchangeable array is taken equal to one machine word (in this case, the length of the array is 32 bits, which corresponds to the most common word length; this number of bits of the buffer register 2 corresponds to four bytes or five characters, however the fifth character in lower-order bits will always contain zeros).

The communication device has two exchange modes. In the first exchange, it goes to the channel to the subscriber (“output” mode). In the second exchange goes from the subscriber to the channel (mode "input).

1. Input mode.

At. As you enter, the subscriber issues a request perceived by the communication unit with the subscribers. When the connection is established, block 9, through block 3, polls block 7 to determine the exchange mode of the subscriber. The result of polling the mode analysis block is to set the mode 5 trigger to the appropriate state. The byte sent out by the subscriber through the receiving node 1 enters the buffer register 2. The receiving and issuing control unit and the receiving counter 11 control the insertion. The block 3 generates a strobe, which is used to add the byte to the buffer register 2. This

the same strobe sets to "1 the first trigger of load register 10, after which the reception counter 11 is transferred to state" 1 (this indicates that the first data byte is stored in buffer register 2). After entering the first byte, block 3 issues a signal to block 6. According to it, block 6 issues a request, which for the channel indicates that the device is ready to issue a symbol. When the channel responds to the request, it sends a signal to block 6 to determine the exchange mode with the subscriber. Block 6, according to the state of the mode analysis block, outputs a mode indicator to the channel. At the same time, a symbol is output to the channel through the output unit 4 and the communication unit with the channel. This character contains the seven most significant bits of the byte contained in buffer register 2. The issuance of the character is controlled by the output counter 8. After the issuance of the character, the output counter 8 is converted to "1. To output the second character, it is necessary to add the second byte from the subscriber who issued the first byte to the buffer register 2. Therefore, after receiving the first byte, block 9 does not interrupt communication with this subscriber, as when exchanging in the normal byte mode. Block 9 blocks requests from other subscribers, and gives the subscriber the potential, which for the subscriber is a sign of readiness to receive regular bytes from him. In other words, the issuance of this potential by block 9 is a sign of a monopolistic exchange mode between the subscriber and the channel. The exclusive exchange mode is kept until the buffer register registers 2 four bytes of data. Receiving the second and subsequent bytes is accompanied by the same actions as receiving the first byte. After receiving the fourth byte, the reception counter 11 is in the state "4, and in the load register 10 is set to" 1 four triggers corresponding to these bytes. After receiving the second byte, a second character is output to the channel, containing the remainder of the first byte and the most significant bits of the second byte. Together with the issuance of the second character, it is reset to "On the trigger register of load register 10, which is set to" 1 when entering the first byte in buffer register 2. The delivery counter 8 is transferred to the state "2. Similarly, the remaining three characters are displayed. As symbols are issued, the bytes from buffer register 2 are reset to "About triggers of unloading register 10, set to" 1 when these bytes are written into buffer register 2. After the last character is issued, issue counter 8 is transferred to state "5." This is a sign of termination of communication with a given subscriber. According to the state of the "5 delivery counter 8, the indication of the exclusive mode is cleared in the communication unit with subscribers, i.e. the blocking of requests of all subscribers is removed. All units of the device for information exchange are reset to the initial state.

2. Output mode.

During output, the operation of the device for the exchange of information differs little from that described.

above. The difference is as follows. After establishing communication with the subscriber and determining the mode of exchange, the communication unit with the channel issues a request to the channel. After the channel accepts the request and polls the exchange mode, it issues a symbol in block 6. This character through the receiving node 1 is entered into the buffer register 2. The insertion of a character is accompanied by the same actions as the entry of a byte when entering.

After entering 2 characters in the buffer register 2, block 3 organizes the issuance of the first byte to the subscriber through block 9. Issuing the next bytes to the subscriber becomes possible as more characters are received from the channel. After receiving the fifth character, block 6 stops issuing exchange requests to the channel. At the end of the fourth byte, block 9 removes the sign of the exclusive mode, as a result of which communication with this subscriber

is terminated.

Thus, the information exchange device establishes an exclusive exchange mode with the subscriber, during which the transfer of one machine word occurs. The next request, perceived by the communication unit with subscribers, may be from any subscriber.

The proposed device allows a 40% reduction in the time of data transfer to the channel.

Claims (1)

Invention Formula A device for information exchange, comprising a receiving node, the output of which is connected to the first input of the buffer register, connected by the second input to the first output of the receiving and output control unit, and the output to the first input of the output node, the second input of which is connected to the second output the receiving and issuing control unit, and the first output with subscribers, the mode trigger, the output of which is connected to the first inputs of the receiving and issuing control unit and the receiving unit, the third inputs of the buffer register and the issuing unit, in order to increase speed, it is entered into a communication unit with a channel, a mode analysis unit, an output counter, a load register, a reception counter, a communication unit with subscribers, moreover, the inputs of the communication unit with the channel are connected respectively to the first output of the mode analysis unit, to the third output of the reception and output control unit, the second output of the output unit, the output of the output counter and the channel, and the outputs, respectively, with the first input of the mode analysis unit, the second input of the receiving node and the second input of the reception and output control unit, the input of the mode analysis unit is connected to the fourth output of the reception and output control unit, and the output with the mode trigger input, input the output counter is connected to the fifth output of the reception and output control unit, and the output is connected to the second input of the communication unit with the Aboneites and the fourth input of the output node, the inputs of the load register are connected respectively to the second input of the communication unit with subscribers, the output of the output control unit and the output, the output of the reception counter and the output of the mode trigger, and the output to the fourth input of the reception and output control unit; the input of the reception counter is connected to the sixth output reception control unit and the output and the output with the fourth input of the buffer register, the third input of the communication unit with subscribers is connected to the seventh output of the reception and output control unit, the output of the communication unit with subscribers is connected to the third input of the reception and output control unit; the first input of the communication unit with the subscribers and the third input of the receiving node are connected to the subscribers.