SU817713A1 - Multichannel priority device - Google Patents

Description

one . ; The invention relates to computing technology and may find some examples in systems where the request of each user can be served by a group of Processing Devices. Multichannel devices are known for the priority selection of pulses, containing an HB element and in each channel two triggers and four And l elements. The lack of devices consists in the limited field of application, since they do not provide the possibility to choose a free servicing device by one request. The closest to the proposed device is a priority device, which consists of two triggers, two AND two-input logic elements and an OR OR element, and each one. Discharge device input of the first trigger is connected to the input of the discharge device, the output of the first trigger with the first input of the first element And whose output is connected to the first input of the second trigger, vysod second trigger connected to the first input of the second element And and the first input of the OR element, the output of the second element I is with the output of the device bit, the second inputs of the flip-flops are connected to the input of zeroing the bit of the device, the second inputs of the first elements And all bits and the second inputs of the second e.oments And all bits with the corresponding and device inputs, the third input of the second trigger of each bit — with the second element input: OR, and with the output of the first element AND the previous bit 2. Its disadvantage is limited scope. The purpose of the invention is to expand the field of application of the device. The goal is achieved by the fact that in a multichannel device, there are two triggers and two AND elements in each channel, with each first output of the first trigger connected to the first input of the first element, whose output is the corresponding output of the device, the first input of the second trigger is connected to the corresponding, the input of the device, and the first output of the second element And the output of the second element And the i-th canal connected to the first course of the first flip-flop l + l-ro channel in each channel input of the first flip-flop ytoroy /

connected to the second input of the first element And the first input of the second element And, the second input of which is connected to the first input of the first trigger, and the third to the second input of the second trigger and the second output of the first trigger, the third input of which is connected to the input of the device requests.

The drawing shows the block diagram of the device.

The device contains in each channel the triggers 1 and 2 and the second and first elements I 3 and 4, exit 5 of the device, inputs of quenching the device and input 7 of the requests from the device.

The device works as follows.

In the absence of requests at input 7, a zero potential acts, the device channels are brought to the initial state by applying zero-reset signals to inputs 6, while the output of flip-off trigger 2 shows a zero potential that arrives at the second trigger input 1 and establishes a unit potential at its second output, zero potentials are established at the outputs of elements K 3 and 4. After removing the zero potential from the inputs 6, the states of the flip-flops remain.

A single request request is sent to input 7 and to the third inputs of the trigger 1 channels. In those channels where the second input of the trigger 1 from the output of the element I 3 of the previous channel reaches zero potential, the request signal does not make any changes in the channel trigger states. In that channel, where the first input of the trigger 1 has the potential of a single level, the second output of the trigger 1 appears zero potential which is fed to the input of the element And 3 and to the second input of the second trigger 2. At the output of the trigger 2 appears the potential of a single level, which is fed to the first input of the element And 3 and the second input of the element And 4 on you during which a single level signal appears.

Upon the expiration of the request signal, a zero potential at input 7 sets the trigger 1 to the state where the first output is zero leoteniss, and the second output is unity. The zero potential from the output of flip-flop 2 is fed to the input of the element I 4, a zero potential is set at its output, a unit after the second output of the flip-flop 1 sets at the output of the element I 3 also a single potentig. On the next request, the channel status, in which the previous request was recorded, remains unchanged and the recording is made as described above into the next free channel of the 5xx: trio.

At the end of the user service, a zero level signal arrives at the corresponding input 6 by switching trigger 2 and causing a zero signal at the output of the channel 3 element of this channel, which blocks all free channels of lower priority that are received for servicing the next request.

Thus, the proposed device provides the possibility of priority service requests

20 from one subscriber alternately group processing devices.

Claims (2)

1. USSR author's certificate in application number 2610883 / 18-24, cl. G About F 9/18, 1978. 2. USSR author's certificate number 425177, CL. G About F 9/18, 1974 (prototype). t i-v