SU1564622A1 - Multichannel device for connection of information sources to common trunk - Google Patents

Abstract

The invention relates to computing and can be used in computing systems of the trunk configuration with decentralized control. The purpose of the invention is to expand the scope by reducing the number of common lines of the device and combining the priority and non-priority arbitration regimes. The device contains three counters, four triggers, a delay element, a switch, an element 2I-OR, two elements NOT, three elements OR, five elements I. The goal is achieved due to the fact that the signal to capture the main line is transmitted along the data tracking signal line, and the signal freeing the trunk - on the data line. 1 il.

Description

The invention relates to computing and can be used in distributed computing systems of the backbone configuration with decentralized control.

The purpose of the invention is to expand the scope by reducing the overall lines of the device and combining priority and non-priority arbitration regimes.

The drawing shows a block diagram of the device.

The device contains counters 1-3, triggers 4-7, elements 8-12, OR 13-15, NOT 16 and 17, 2I-OR 18, delay element 19 and switch 20 and has a channel code input 21, data tracking input 22, data input 23, request confirmation input 24, synchronization inputs 25 and 26, initial input 27

settings, channel number input 28, hangup exit 29, common lines 30 and 31, and query input 32.

The device works as follows.

When recording a request for capturing a common highway, the subscriber exposes a signal to input 32, and if there is no transfer signal from the output of element 12 at the output of counter 1, 1 is written into trigger 4 (the duration of the signal at input 32 is longer than the transfer signal of counter 1) the signal at the output of the element And 12 in the counter 3 is entered the code on the number of bits transmitted in the packet, issued by the subscriber to the input 21,

The busy state of the common highway is displayed in trigger 7, when the trunk is occupied in trigger 7. 7 is present, when free - O,

When the trunk is busy, the passage of transfer signals through element 11 and sync signals from input 26 to input-H of counter 1 through element 2 is AND-OR blocked, if not, it is allowed, and an arbitration procedure is implemented based on the fact that The transfer signals of the counters I of different channels are generated at different times. When a transfer signal is generated by the counter of the K-th channel that requires capturing of the Ma-L1.1 trunk (1 in the 4 trigger), and O in the trigger 7 on the And 11 element, a signal is captured on the highway outputted via the OR 13 element to the line 30. the signal on line 30 is triggered by triggers 7, as a result of which all the channels record the ck state of the trunk is occupied. A signal on line 30 until the trigger 7 is transferred at the output of element 10 forms the installation signal of counter 1, while counters 1 of different channels record different codes set at inputs 28. The installation of counters 1 is effected by the output signal of element 1 and s at position C of the switch, at its position b, the installation of counters 1 is made at 1 with trigger 7.

At 1, trigger 7 blocks the passage of sync signals from input 26 to input +1 of counter 1 and passing signals through element 11. At the falling edge of the signal from element 11 output, trigger 5 records 1 and exposes signal K to the subscriber. When transmitting a packet, data is transmitted along line 31, and data tracking signals are transmitted along line 30, the content of counter 3 decreases by 1 for each tracking signal on the transmitter channel and element 9 decreases, and for each data bit at the position of the switch (arbitration-free mode) damages the contents of the counters of all channels (data bits arrive at the input -N of counter 1 through element 2 AND-OR 18). Upon completion of the packet transmission on the signal transfer of the counter 3 channels of the transmitter to the trigger 4, O

five

3

five

The trigger in trigger 5 is also entered into O. The transfer signal of counter 3 in the transmitter channel through delay element 19 and OR element 14 is output to line 31 (trunk release signal). On the leading edge of the signal, Release in the trigger 6 is written O, and on the falling edge O from the trigger 6 is rewritten in trigger 7, fixing the fact of the release of the highway. When data is transmitted, the signals on line 31 are accompanied by signals on line 30, therefore, on the leading edge of the signal on line 31 in this case, O, but, are recorded in triggers 6. the signal on line 30 is recorded in them 1 before the arrival of the falling edge of the signal on line 31, hours, therefore, in this case, the falling edge of the signal on line 31 in trigger 7 confirms state 1. When switch 20 is in position a by the time of release the state of the counters 1 is random, since the number 1 is random in the packet, but the states of the counters 1 of different channels are different, since the installation of the counters 1

Q was produced by a single signal, and their content was also increased by the same signals; This mode of operation ensures the start of arbitration from a subscriber selected at random, i.e. 3 unattended servicing requests for seizure of the trunk. At position 5 of the switch, arbitration always starts with the highest priority subscriber.

The device provides for the control of a false seizure of the trunk and the exit of subscribers from the inter-machine exchange support subroutines, based on

5 that if there is no data transmission for a captured trunk for the time specified by the conversion factors of counters 2, the transfer signal is thrown out. On signal

Q transfer in the canapes that captured the highway (1 in the trigger 5), at the output of the element And 8 a signal is generated,

O in trigger 4

0

recording

and, respectively, the trigger 5. The signal from the output of the element AND 8 through the element OR 14 on line 31 is given a signal to release the line (the signal to release the line is issued without a signal

on line 30). To implement the hang-up control, for each pulse transmitted via line 30, counters 2 are reset.

i

Before starting, a signal is sent to input 27, through which triggers 6, 7 and 4 (and therefore 5) are recorded O. Then one of the subscribers exposes the requirement to capture the highway to input 32 and after providing the highway to it by the transfer signal of counter 2 the release signal of the trunk by which the E flip-flops 7 register the state of the trunk is free, this procedure ensures the initial installation of the counters 1. Releasing the common highway after its capture to the initial installation is also possible from the counter 3 after transmitting Nogo expression.

Claims (1)

Invention Formula A multichannel device for connecting information sources to a common highway containing K (K is the number of information sources) channels each of which contains the first and second counters, the first and second triggers, the first element is NOT, the first element is AND, the first element is OR, and on each channel the inverse output of the first trigger is connected to the installation input O of the second trigger, the output of which is connected to the device launch launch confirmation output and to the first input of the second element AND, characterized in that, in order to expand the area application by reducing the number of common lines and combining the priority and non-priority arbitration modes, each channel of the device additionally contains third and fourth triggers, second and third counters, element 2 AND-OR, second element NOT, switch, second and third elements OR , with. second and fifth elements And, the delay element, and in each channel the input channel request channel device is connected to the first input of the second element And, the second input of which is connected to the output of the first element NOT, the input of which is connected to the overflow output of the first counter and the first input of the third element And, the second entrance is ko1564622 0 s five 0 five 0 five 0 five 0 five second, it is connected to the direct output of the first trigger, the installation input to 1 of which is connected to the output of the second element I and to the input of the entry of the second counter, the overflow output of which is connected to the synchronous input of the first trigger and to the input of the delay element whose output is connected the input of the first OR element, the second input of which is connected to the output of the first element II and the first input of the second PLI element, the output of which is connected to the installation input of the first trigger; the output and the first input of the fourth element AND are connected respectively to the counting input of the second counter and to the output of the second trigger the synchronous input of which is connected to the output of the third element II and to the first input of the third element OR, the second input of the first element I is connected to the output of the hang signal of the device’s main line and to the output of the second floor The third counter, the installation input in O 1 of which is connected to the first input of the fifth and third inputs of the third element II, to the first input of an element 2 I-LLY and to the inverse output of the third trigger, the direct output of which is connected to the first fixed contact the switch and the second input of the element 2 AND-OR, the output of which is connected to the counting input of the first counter, the input of which is connected to the moving contact of the switch, the second fixed contact of which is connected to the output of the fifth element And, the output of the second element H E is connected to the synchronous input of the third flip-flop, the installation inputs in O of the third and fourth triggers are connected to the second input of the second OR element and to the input of the device channel initial setup, the output of the fourth flip-flop is connected to the information input of the third trigger, the information inputs of the first and fourth triggers and the third counter are connected with the UI logical zero of the device, the information input of the second trigger is connected to the bus of the logical unit of the device, the inputs of the channel number, the number of transmitted bits, data, driving data, the first and second sync inputs of the device channel are connected respectively to the information inputs the first and second counters, with the third input of the first and second inputs of the third element OR, with the counting input of the third counter and the third input of element 2 AND-OR, the outputs of the first elements OR of all channels of the device are connected via INSTALLATION II and connected to the sync inputs of the fourth trigger, with inputs the second elements are NOT and with the fourth inputs elements 2 AND-OR of all channels of the device, outputs of the third elements OR of all channels of devices are connected through INSTALLATION OR and connected to the second inputs of the fourth and fifth AND elements, with installation inputs of 1 third and fourth triggers and t inputs of the third counters of all device channels . g-