SU1686443A1 - The subscribers-to-common bus multiplexer - Google Patents

Abstract

The invention relates to computing, in particular, to priority devices, and can be used to organize access from several subscribers to a common resource, namely to a common highway. The purpose of the invention is to increase the reliability of the device due to the billing / parallel connection of channels to the polling line. The device contains M channels, before the first channel there are two triggers, the element is NOT, two elements are AND, a single vibrator, two delay elements, after the last channel is the element NOT, the element OR, the element AND, the trigger, the delay element, before each channel is unidirectional element, and in each channel - the element is NOT element OR. element 2 and - or. element And, two trigger, delay element, one-shot. The polling signal is transmitted through the information channel without tracking along the synchroline, which is different from the information signal. When a resource is captured, the channel issues a signal to an auxiliary unidirectional line, from which polling of the other channels is blocked, which allows refusing the allocated arbitration ring. 1 il. sl C

Description

The invention relates to computing, in particular, to priority devices, and can be used to organize access from several subscribers to a common highway.

The purpose of the invention is to increase the reliability of the device due to the parallel connection of channels to the polling line.

The drawing shows a diagram of the device.

The device contains To channels 1.1 - 1.k, before the first channel - triggers 2, 3, the element is NOT 4, the elements are And 5. 6, the one-shot 7, the delay elements 8, 9, after the last channel - the element is HE 10, the element

2I-OR 11, element AND 12, trigger 13, delay element 14, and in each of K channels 1-element NOT 15, element OR 16, element 2И-OR 17. element AND 18, triggers 19, 20, delay element 21 , one-shot 22, in front of each channel - a unidirectional element (isolation element) 23, request input 24, request confirmation output 25, input

26 synchronization and information input

27 channels of the device.

The device works as follows.

When the device is turned on, the one-shot 7 produces a polling pulse, setting the trigger 3 in 1 and

00

about

J

with

The first input element, AND-OR 11, is set to O flip-flop 13. In each channel, the polling pulse sets 1 flip-flop 20 and enters the C input of flip-flop 19, polling the channel. If there is no request in the channels (low potential at the inputs of request 24), then polling from the output of element 2I-OR 11 sets trigger 13 to 1, and from output of element 12 is transmitted in the opposite direction, sets trigger 13 to O, also set to O the triggers 20 in the channels (no polling is performed). Then the pulse appears at the output of the one-shot 7, the survey is resumed and t, e. Let the request be made in the channel. Then the polling pulse sets in the channel trigger 19 to 1, the one-shot 22, triggered on both fronts, produces a pulse - in the channel two polling pulses. At the same time, the other channels are not polled, since in each channel trigger 20 is in the zero state (the delay of element 21 is longer than the interval of polling pulses when a channel is selected, and the delay time of elements 21 increases with increasing channel number). Since the delay 14 is greater than the polling pulse interval when a channel is selected, a pulse does not appear at the output of the And 12 element. After the end of the request service, a low potential appears at the input of request 24, trigger 19 is set to O, the one-shot 22 produces a pulse, which is fed to the input of element 2I-OR 11. At the same time, the channels to the right of the selected channel are polled (triggers 20 of these channels are set to 1). ). If no channel is selected, a polling pulse appears at the first input of element 2I-YLI 11. Setting the trigger 20 of all channels to zero — the circuit in the initial state. If at least one channel is selected, two pulses go to the third input of element 2I-OR 11 (no polling is generated). The triggers of the 20 channels to the right of the selected one remain in O. Next, the circuit works similarly to the description given. When transmitting information on input 27, each bit of information is accompanied by a single tracking signal at input 26. The number of single bits in the packet transmitted on input 26 must be even. The proposed device is characterized by high reliability, since the failure of any of the channels of the arbitrator does not lead to the failure of the entire system.

Claims (1)

Claims of the Invention A multichannel device for connecting subscribers to a common trunk. containing the first and second elements NOT, the first and second triggers, the one-shot, the first and second delay elements, the first and second elements of the AND and K channels (K number of subscribers), each of which contains two triggers, the element And, the element 2I-OR, the element OR, a delay element, a one-shot and a NOT element, so that, in order to increase 0 reliability due to the parallel connection of channels to the interrogation line, it additionally contains decoupling elements, element 2И-OR, the third delay element, the third trigger, and the third element I. 5, the output of the first element is connected to the first input of the first element I, the output of which is connected to the synchronous input of the first trigger, the information input and input of the installation in O of which are connected respectively to 0 by the bus of the logical unit of the device and the output of the first delay element, the input of which is connected to the output of the first trigger and the start input of the one-shot, the output of which is connected to the counting input of the second trigger and the input of the second delay element, the output of which and the output of the second trigger are connected respectively to the first and second the inputs of the second element And, the output of which is united with 0 output of the third element And is connected to the second input of the first element And survey inputs and information inputs of all channels of the device and the first input of the element 2I-OR, the second and third inputs 5 of which is connected to the output of the second element NOT and to the bus of the logical unit of the device, the output of element 2И-OR is connected to the counting input of the third trigger and the input of the third delay element, output 0 which is connected to the first input of the third element I, the second input of which is connected to the output of the third trigger, the inputs of the first and second elements are NOT connected to the synchronization inputs of all channels of the device and the blocking inputs of all channels of the device, the input of the first isolator is connected to the logical zero bus device and the input of the ban request the first channel, the output of the ban request M-go (M T. 0 to 1) the channel of the device is connected to the output of the M-th element of the isolation and connected to the input of the prohibition of the request for the M + 1th channel of the device and the input of the M41-th element of the development, the output of the prohibition of the request for the K-th channel 5 is connected with the output of the K-th element of the isolation and is connected to the fourth input of the element 2И-OR. and in each channel of the device the polling input is connected to the first inputs of the element 2И-OR and the element OR, the second input of which is connected to the second the input of the 2I-OR element and the prohibition input of the device channel request, the output of the OR element is connected to the counting input of the first trigger, the output of which is connected to the first input of the second element AND, the second input of which is connected to the output of the delay element whose stroke is connected to the output of the 2I element- OR, the third input of which is connected to the output of the element NOT, the input of which is connected to the input of blocking the channel of the device, the output of the prohibition of the request for the channel of the device is connected to the output 0 the one-shot trigger input of which is connected to the inverse output of the second trigger, whose synchronous input is connected to the output of the second element AND and the third input of the OR element, the installation input to O, the direct output and the information input of the second trigger are connected respectively to the request input, the request confirmation output and the logic input device channel units, the fourth input of element 2I- OR is connected to the bus of the logical unit of the device.