SU1383352A1 - Multichannel device for connecting subscribers to common trunk line - Google Patents

Abstract

The invention relates to computing and can be used in multi-machine systems and local area networks of computers to control access to a common resource. The purpose of the invention is to expand the field of application of the device by reducing the number of lines of the common highway. The device contains channels, each of which contains a counter 1, 2, multiplexer 3, register 4, comparison circuit 5, triggers 6-9, element AND 10 and 13, elements OR 11, 12. When arbitrating requests for the capture of a common trunk, Starting on a common line of priority bits for subscribers requiring the capture of a line. Subscribers that have not the highest priority for the line issued to the trunk are excluded from the further arbitration procedure. 1 il.

Description

The invention relates to computing and can be used in multi-machine systems and local area networks of computers to control access to a certain resource.

The purpose of the invention is to expand the field of application of the device by reducing the number of lines of the common trunk, as a result of which only one subscriber requiring an inter-machine exchange can be connected to the common trunk.

To eliminate the mismatch of the work of the individual channels, the working hour is 15 tons, used to spread the priority codes one line, formed at the output of the counting trigger connected to the transfer output of the second counter connected to the 20 Channel Synchronous Input. All of the new features introduced are significant, as they are in: together with the known features.

only after the release of the total mistral (removal of the busy signal from line 18).

In the zero state, the triggers on the input of the installation of the trigger 9 serve with a signal that sets it to the left state, the same signal sets the counter 2 and blocks its operation in the counting press. When installing the counter 2, the number can be written in which, in the event of the arrival of the first and pulse at the input and 1 in the trigger 6, the transfer output of the counter 2 forms a pulse / pulse. The coefficient of recalculation of counter 2 and the input frequency at the input are selected in such a way that the period of transfer pulses would be more than twice the signal propagation time along the common line between the most distant subscribers. The transfer signal from the output of counter 2 is fed to the trigger input of the trigger

ensuring the operability of the device-25 For unlocking the counting mode

only after the release of the common highway (removal of the busy signal from line 18).

In the zero state, the flip-flops 6 on the installation course of the flip-flop 9 are given a signal that sets it to the zero state, the same signal is used to set the counter 2 and block its operation in the counting mode. When installing the counter 2, a number can be recorded in it, in which case of the arrival of the first pulse at the input and 1 in the trigger 6, the output of the transfer of the counter 2 is formed / pulse. The conversion factor of counter 2 and the input / input frequency are selected so that the period of transfer pulses is more than twice the time / signal propagation along the common line between the most distant subscribers. The transfer signal from the output of the counter 2 is fed to the counting input of the trigger 9.

technologies allow to obtain a positive effect, consisting in the possibility of using the device in systems with a common backbone, including one information line.

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

The device channel contains counters 1 and 2, multiplexer 3, register 4,

the counter 2 to the trigger 6 is entered 1. The unlocking of the counting mode of the counter 2 is accompanied by the formation of a working (frequency, use 30 to organize an arbitrator procedure at the output of the counting trigger 9.

When a worker arrives, often in all channels that have set up a trunk seizure,

circuit 5 comparison, triggers 6-9, electrical connection via

ment And W, elements OR 11, 12, element AND 1 3, request, input channel 14, channel reset input 15, channel clock output 16, common line bus 17 and 18, channel acknowledgment output 19.

The device works as follows.,

The subscriber enters the request for the seizure of the highway to the trigger 8, giving the signal to the input 14 of the request. When the common highway is empty, when there is no busy signal on line 18, the installation of counter 1 occurs. If there is 1 in trigger 8, entry 1 in trigger 6 occurs when the common highway 18 is released.

When writing 1 to the trigger 6 of at least one channel, an occupation signal is output via line OR 11 to line 18. Subscribers that require a trunk being captured during its busy are entered into requests for triggers 7, but the census 1 for triggers 6 occurs

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multiplexer 3 and element AND 13 rads of the register of priority 4 to the common line 17. In this case, if in the subconnect to the line 17, the bit of the dereg 4 of at least one channel contains then on line 17 a signal

The bit connected to the 17 h line of the multiplexer 3 is determined by the house fed from the counter output to the multiplexer address input. The counter content increases when each new pulse arrives from the trigger output. In the comparison circuits 5, signals are detected in the switching line. dah registers 4 which are with O in the presence of 1 on the line

When O at the output of cxetAi 5, compared to the moment of the falling edge of the signal at the output of the flip-flop 9, the flip-flop 6 of the corresponding channel is zeroed. In this case, the trigger output is connected to the C input of the trigger 6, to the D input of which the output is connected

the counter 2 to the trigger 6 is entered 1. The unlocking of the counting mode of the counter 2 is accompanied by the formation of a working (frequency used 30 to organize the arbitration procedure) at the output of the counting trigger 9.

When a working frequency arrives in all the channels that have put requests for the capture of the trunk,

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five

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five

multiplexer 3 and the AND 13 bits of the priority register 4 to the common line 17. In this case, if the bit of the dereg 4 connected to the line 17 contains at least one channel, then a signal is formed on line 17.

The bit connected to line 17 through multiplexer 3 is determined by the code fed from the output of counter 1 to the address input of multiplexer 3. The content of counter 1 increases as each new pulse arrives from the output of trigger 9. In the comparison circuits 5, channels are detected In the 17 bits switched to the line, registers 4 of which are O if there is 1 on line 17.

When O at the output cxetAi 5 of the comparison, at the moment of the falling edge of the signal at the output of the trigger 9, the trigger 6 of the corresponding channel is zeroed. In this case, the output of the trigger 9 is connected to the C input of the trigger 6, to the D input of which the output of the comparison circuit is connected. With 1 at the output of the circuit, 5 comparisons on the falling edge of the signal from the output of flip-flop 9, the state of flip-flop 6 is preserved. When resetting the trigger 6, the counting mode of the counter 2 and the formation of the operating frequency at the output of the trigger 9 are blocked. Thus, after zeroing the flip-flop 6 ercf, the zero state is preserved until the next arbitration procedure begins, at the zero flip-flop status 6, the output through the AND 13 bits of register 4 of the corresponding channel to the common line 17 is blocked. But the transfer signal of the counter 1 produced by the completion of the cycle of output to the line 17 of all bits of the priority registers 4, the contents are overwritten; trigger 6 to the trigger-20th channel input is connected to the input of ger 7. When writing 1 to trigger 7, through the element SHSch 11 on line 18. a busy signal is set, previously set from trigger 6. Moreover

installation of the second trigger, the output of which is connected to the first input of the second element And, the output of which is connected to the input of the installation of the first

The arbitration procedure described is 6spepe-25 flip-flop, the direct output of which misses the entry into the flip-flop, 7 only

dinene with the first input of the first element OR. information input of the trigger trigger, the first input of the first element And the channel reset input

one channel that made a request to capture the trunk and having the highest priority code in register 4 among all the channels whose subscribers JQ is connected to the reset inputs of the second and participated in the arbitration procedure. the third trigger and the first input According to the transfer signal of the counter 1 from the second element OR, the output of which

connected to the reset input of the first trigger, the inverse output of which is connected to the reset input of the second switch, the output of which is connected to the clock input of the first trigger and

holding on the element OR 12 produces the trigger of trigger 6 and blocking the Dacha through the element 13 of the signals from the output of multiplexer 3 to the line "17. In the zero state, the trigger 351

Gera 6 blocks the operating frequency from the trigger output 9. For information about the seizure of the trunk, the subscriber is at the second input of the second element OR is decelerated from the output 19. As a result, the subscriber released the signal to the input 15 of his channel, Grood

and a clock input of the third trigger, the output of which is the channel acknowledgment output and connected to the second input of the first OR element,

reset triggers 6-8. When reset, the channel clock input is connected to

The SRI of trigger 7, the busy signal from line 18 is removed.

Fomula invention

the counting input of the second counter, the multiplexer stroke is connected to the second input of the first element AND, the outputs of the first elements OR of all channels through the installation AND connected to the reset of the first counter 9 in all channels and the second inputs of the second elements AND of all channels, outputs of the output elements And all channels through mounting OR connected to the second

A multichannel device for connecting subscribers to a common line containing N channels (N is the number of device subscribers), each

the counting input of the second counter, the multiplexer output is connected to the second input of the first element AND, the outputs of the first elements OR of all channels through the installation AND connected to the reset inputs of the first counter 9 of all channels and the second inputs of the second elements AND of all channels, the outputs of the first elements And all channels through mounting OR connected to the second

of which contains the register, the first by the inputs of the comparison circuits of all channels.

counter, multiplexer, comparison circuit, first trigger and first element I, the register output group is connected to the multiplexer information input group, the output of which is connected to the first input of the comparison circuit, output Equal to which is connected to the information input of the first trigger, the output group of the first counter is connected to a group of control inputs of the multiplexer, characterized in that, in order to expand the field of application of the device so as to reduce the number of lines of the common highway, two channels are inserted into each channel of the device a trigger, a second counter, two OR elements, a second AND element, with the channel's request input connected to the input

installation of the second trigger, the output of which is connected to the first input of the second element And, the output of which is connected to the installation input of the first

dinene with the first input of the first element OR. the information input is connected to the reset inputs of the second and third triggers and the first input of the second OR element, the output of which

the second trigger, the first input of the first element And the channel reset input

connected to the reset inputs of the second and third triggers and the first input of the second OR element, the output of which

351

the counting input of the first counter, the output of which overflows:

with the second input of the second element OR

and a clock input of the third trigger, the output of which is the channel acknowledgment output and connected to the second input of the first OR element,

0

the counting input of the second counter, the multiplexer output is connected to the second input of the first element AND, the outputs of the first elements OR of all channels through the installation AND connected to the reset inputs of the first counter 9 of all channels and the second inputs of the second elements And of all channels, the outputs of the first elements And all channels through the installation OR connected to the second

Claims (1)

A multi-channel device for connecting subscribers to a common trunk, containing N channels (Ν number of device subscribers), each of which contains a register, the first '^ 5 counter,' Multiplexer, comparison circuit, first trigger and the first AND element, and the group of register outputs is connected to the group of information inputs of the multiplexer, the output of which is connected to the first input of the comparison circuit, the output of which is also connected to the information input of the first trigger, the group of outputs of the first counter is connected to the group of control inputs of mules typlexer, characterized in that, in order to expand the scope of application of the device za by reducing the number of lines of the common trunk, two triggers are introduced into each channel of the device, a second counter, two OR elements, a second AND element, we receive the channel request input connected to the input installation of the second trigger, the output of which is connected to the first input of the second element AND, the output of which I is connected to the input of the installation of the first trigger, the direct output of which is connected to the first input of the first element OR, the information input of the third trigger, By the first input of the first AND element, the channel reset input is connected to the reset inputs of the second and third triggers and the first input of the second OR element, the output of which is connected to the reset input of the first trigger - whose inverse output! connected to the reset input of the second counter, the output of which is connected to the clock input of the first trigger and the counting input of the first counter, the overflow output of which is connected to the second input of the second OR element and the clock input of the third trigger, the output of which is the output ^! confirmation channel and connected to the second input of the first element OR, the clock input of the channel is connected to the counting input of the second counter, the output of the multiplexer is connected to the second input of the first element AND, the outputs of the first elements OR of all channels through the mounting AND are connected to the inputs of the reset of the first counters of all channels · And the second inputs of the second elements AND of all channels, the outputs of the first elements AND of all channels through the wiring OR are connected to the second inputs of the comparison circuits of all channels.