SU1278870A1 - Multichannel device for connecting the using equipment with group of common buses - Google Patents

Abstract

The invention relates to computing technology, in particular, to devices for arbitrating common highways of computing and Mnoion-processor systems with several common highways. The aim of the invention is to expand the field of application by providing the possibility of connecting each subscriber to one of the common trunk lines of the group. The goal is achieved by the fact that in a multi-channel device containing in each channel three groups of trunk amplifiers, three multiplexers, a modulo-two adder, the first counter, a priority register, three triggers, and three AND elements, are entered into each channel decoder, the second counter, and the fourth element I.1 Il.

Description

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The invention relates to computing and can be used in multi-machine computing systems with several main lines.

The purpose of the invention is to expand the field of application of the device by allowing subscribers to capture one of several highways and use highways from one information line.

The drawing shows the block diagram of a single channel device.

The device contains in each channel the main amplifiers 1-3 of the first, second and third groups, multiplexers 4-6, adder 7 modulo two, first counter 8, priority register 9, triggers 10-12, elements 13-15, deimfrator 16, the second counter 17, the fourth element AND 18, the channel request input 19, the channel availability output 20, the information bus 21 of the channel, the information buses 22 of the common trunk lines, the busy bus line 23, the channel synchronization inputs 24 and 25, and the channel reset input 26.

The device works as follows.

In the initial state, triggers 10-12 are entered with a signal at input 26. A request to capture one of the common highways is made by the subscriber to the input 19 of his channel. The signal at input 19 is recording 1 in the trigger 10 channel. With a single state of the trigger 10 and a zero state of the trigger 11, the input 24 through the element 14 connects to the input of the counter 17. When each clock pulse arrives, the content of the counter 7 increases and the channel is connected to the channel through a multiplexer 6 times 23 of different trunks until the moment connection is unrelated to that trunk. In this case, the counter 8 is nullified by the / signal from the output of the multiplexer 6, and when the trigger state 10 is at the unit state, a signal is generated at the output of the AND element 13, which sets the trigger 11 into a single state. In this case, the element 14 is blocked and the counter 17 is disconnected from the input 24. The fixed state of the counter 17 determines the trunk connected to the channel for

implementation of the procedure for analyzing the priorities of subscribers claiming to seize this highway. At the same time, the tines 23 are connected to the channel via the multiplexer 6 and trunk amplifiers 1, and the information lines 22 of the trunks used for sequential priority codes, through the trunk amplifiers 3 and multiplexer 5. When recording 1 to trigger 1 on the connected bus 23 busy signal is generated (low potential) busy resulting in the removal of the signal from the output of the multiplexer 6.

With the single state of the trigger 11 and the zero state of the trigger 12 through the element 15, the clock pulses from the input 25 are fed to the input of counter B. In all channels that have requested and connected to the trunk specified by the state of the counter 17, the serial connection starts through multiplexers 4, elements 18 and amplifiers 3 (selected by the excited output of the decoder 16) of register bits 9 to the first information line of the line selected by the channel (; counter 17). In this case, if the 1 bit connected to the Tin 22 of the de register 9 of the channel contains 1, then a signal is generated on the line. On the adder 7, channels are detected, in the switched bits of the registers 9 of which are O when there is a signal on the connected bus channel 22, i.e. Channels connected to this trunk that are not of the highest priority are detected. The signal from the output of the adder 7 and the falling edge of the sync pulse, from the input 25, triggers the flip-flop P of the corresponding channel. By the signal of Transfer from counter 8, generated at the end of the cycle, 22 lines of all bits connected to the channel are output

Claims (1)

Priority, register 9 records the contents of trigger 11 into trigger 12, thereby blocking the passage of clock pulses from input 25. to the input of counter 8. As a result of process 1, only one channel (connected to this highway) and having the highest priority among the channels whose subscribers put out a request. When writing 1 to the trigger 12 of the channel that captures the highway, the informational information of channel 21 of the channel is connected to the corresponding highway 22 (the highway determined by the state of the counter 17). This connection is made through the trunk amplifiers 2 of the corresponding channels. The acknowledgment signal of the seizure of the trunk is removed by the subscriber from the output 20. The reset of the trigger 10-12 subscribers that captured the trunk is made on the signal at the input 26 after the exchange is completed. If, during the analysis of the priority, the reset from trigger 11 occurs, then the clock pulses from input 24 through the And 14 element are again connected to the input of counter 17, and then the search for the next empty highway (no busy signal on the bus 23 of this highway) begins, after finding which the counter 8 is reset, write 1 to the trigger 11 and the procedure compared to the priorities as described. The uniformity of service to different subscribers is achieved by a different order of connecting the outputs of counter 17 to the input of the decoder 16 and multiplexers 5 and 6 (this connection determines the order in which the lines are connected to the channel). Multi-channel device - to connect subscribers to a group of common highways, containing in each channel three groups of main amplifiers, three multiplexers, sum modulo two, first counter priority register, three triggers and three elements, And, the installation input and output of the first trigger connected respectively to the input of the channel request and to the first inputs of the first and second elements I, the output of the first element I connected to the installation input of the second trigger, the direct output of which is connected to the infor inputs of the main amplifiers of the first group and to the information input of the third trigger, the synchronous input of which is connected to the output of the the first counter is transferred to the subscriber readiness input and the first control inputs of the main amplifiers, the second grouping input of the second Tpvsrrepa and the output of the third element 11, the second input of which is connected to the second synchronization input or} 1ect. The first information inputs-outputs of which are connected to the subscriber's information output, the output of the priority register is connected to the information input of the first multiplexer, the address input of which is connected to the code output of the first counter, and the output to the first input of the modulo two. to the information input of the second trigger, and the second input to the output of the second multiplexer, connected by a group of information inputs to the information buses of the group's common highways, the outputs of the trunk amplifiers of the third group and the second information inputs / outputs of the main amplifiers of the second group are connected to the information wagons of the group's common highways, the outputs of the main usrliters of the first group are connected to the terminals — the occupants of the general highways of the group, about the l and distributions of the application area, are entered into each channel the decoder, the second counter and the fourth element And, and the inverse output of the third trigger is connected to the first inputs of the third and fourth elements And the second input and output of the fourth element And connected respectively At the output of the first multiplexer and at the information inputs of the trunk 1, third amplifiers of the third group, the control inputs of the trunk amplifiers of the first and third groups are connected to the corresponding outputs of the deamplifier and to the second control inputs of the main amplifiers of the second group, the inverse output of the second trigger is connected to the second input the second element And connected by the third input to the first sync input of the subscriber, and the output to the counting input of the second counter, the output of which is connected to the input of the decoder and The common inputs of the second and third multiplexers, the group of information inputs of the third multiplexer are connected to the busses of the common main lines, and the output to the second input of the first element I and the input reset, the first counter, the input input of which is connected to the control input of the first the multiplexer and the direct output of the second trigger; the reset inputs of the first ,, second and third triggers are connected to the reset input of the subscriber.