SU1397911A1 - Multichannel device for connecting subscribers to common bus - Google Patents

Abstract

The invention relates to computing, in particular, to information exchange systems, and can be used to organize the joint operation of a group of autonomous devices connected to a common highway. The purpose of the invention is to increase the speed of the device. A multichannel device for connecting subscribers to a common trunk contains a delay element 2, channels 3, a HE element 16 and an AND 17 element. Each channel contains triggers 7 and 9, an AND 8 element, a NOT elements 10, 11. The device allows the selection of a request signal One cycle of operation ycTpofiCTsa, the duration of which is determined by the delay in the operation of the channel elements of the device. 1 il.

Description

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The invention relates to computing technology, in particular, to information exchange systems, and can be used to organize the joint operation of a group of autonomous devices connected to a common highway.

The purpose of the invention is to increase the speed of the device.

The drawing shows a block diagram of the device.

The device comprises a synchronization bus 1, a delay element 2, channels 3, a demand signal signal bus 4, a bus busy bus 5, and a synchronization signal generator 6. Each channel 3 contains a trigger 7, the element AND 8, the trigger 9, the elements NOT 10 and 11, the inquiry 12 and interrogation 13 inputs, the resolution output 14 and the interrogation output 15. The synchronization signal generator 6 contains the element 16 and the element 17.

The device works as follows.

In the absence of requests from subscribers, at the inputs of all 12 channels, low-level signals are set, which keep the flip-flops 9 in the zero state. At the same time, on buses 4 and 5, high level signals are supported through the elements HE 10 and 11, and a low level signal is output at the output of the synchronizer 6. The initial state of the trigger 7 is arbitrary.

The request signals from one or several subscribers entering inputs 12 decelerate the trigger 9 in the corresponding channels and through the element NOT 10 install a low level signal on the bus 4 of the signal of the presence of requests, which is inverted by the element HE 16 and transmitted through the element 17 to the bus 1 sync. The leading edge of this synchronization signal records incoming requests in triggers 7 and triggers delay 2. After a time interval sufficient to trigger the trigger 7, the signal from the delay element 2 arrives at the interrogation input 13 of the first channel with the highest priority. If there was no request from the subscriber, then the trigger 7 is not set in this channel, the permission signal on vyh.ode 14 is not generated, and the interrogation signal is not

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the cut element AND 8 is transmitted to the next channel. If the request from the subscriber was present and fixed by the synchronization signal in channel trigger 7, then the interrogation signal by the leading edge puts trigger 9 into one state, since its D input has a high signal from the forward output of trigger 7. The low signal from the inverse output trigger 7 blocks the propagation of the interrogation signal through the element AND 8 to the channels with lower priority. The high level signal from the output of the trigger 9 permits the subscriber to connect to the common highway and through the element NOT 11 sets a low level on the bus 5 to the trunk, which removes the synchronization signal from bus 1 via the element 17 and the interrogation signal from the output of the delay element 2.

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At the end of the information exchange on the common highway, the serviced subscriber removes the signal from the inquiry input 12 and clears trigger 9. At output 14, the subscriber connection signal is removed and the high level signal is set through the NOT element 11 on bus 5. Further operation of the device is determined by the presence of requests at the inputs 12: either the device waits for one or several requests or starts the next cycle of priority service of subscribers, transmitting the synchronization signal to the bus 1 through the And 17 element.

Claims (1)

Invention Formula A multichannel device for connecting subscribers to a common line containing N channels (N is the number of subscribers), each of which contains two triggers, an AND element and two NOT elements, the C input of the first trigger is connected to the device sync bus, and the D input is connected to the request the channel input, the output of the second trigger is the output of the channel resolution, the outputs of the first elements of NOT all channels are combined through the mounting AND to form a bus busy line, characterized in that, in order to increase speed, it contains rzhki - 1397911 the element is NOT and the element is And, the output of which is gistrali device, the output of element I pogo connected to the input element for the i-ro channel (i 1, N-1С with the support and bus synchronization device-the first input of the element and the C-input the output of the delay element of the second-second trigger (i + 1) -ro channel, in Dinen with the first input of the element And in each channel the request channel RESPONSE With the input of the second trigger of the first ka-connected to the R-input of the VTSfy trigger the outputs of the second element are NOT all and the input of the second element is NOT direct channels are connected through mounting And, the output of the first trigger is connected to the image of the bus availability request device-D-input of the second trigger, the output facilities, and are connected to the input of the elements of which is connected to the entrance of the first NOT, the output of which is connected to the first element NOT, the inverse output of the first the input of the element And, the second input of a trigger-trigger is connected} 1en with the second input pogo connected to the bus occupation ma-element I.