SU868759A1 - Multichannel device for control of priority of interrogation processing - Google Patents

Description

(54) MULTI-CHANNEL DEVICE FOR CONTROLLING THE QUALITY OF HANDLING PROCESSING

The invention relates to computing, in particular, to the service sequencing control devices, and can be used in the construction of shared use systems.

A device for processing requests with priority control, containing a pulse shaping unit, an encoder, AND and OR circuits, a memory unit, a counter, a decoder, a synchronization unit, a delay line 1 is known.

The disadvantage of such a device is a large amount of equipment.

The closest in technical essence and the achieved result to the proposed one is a multichannel device for managing the order of requests processing, which contains read and write counters, delay elements. AND, OR, the inverter and the comparison circuit, and in each channel - the register, the comparison circuit, the first and second And elements, and the trigger 2.

The disadvantage of this device is a large amount of equipment.

The purpose of the invention is to simplify the device and expand the scope.

This goal is achieved by the fact that in a multichannel device for managing the request processing sequence containing channels, and in each channel the first trigger and the element I, the first input of which is connected to the output of the first channel trigger, a single trigger input is connected to the corresponding request input of the device, Three triggers and a switch are entered into each channel, the first and second inputs of which are connected respectively to the outputs of the second, left trigger and their channel AND element, the first output of the channel switch is connected to and the second trigger input of the subsequent channel, the second output of the simulator is connected to the synchronization input of the third trigger of this channel, the direct output of which is connected to the corresponding output of the device, the zero input of the first trigger of its channel and the information input of the fourth trigger of its channel, inverse and direct the outputs of which are connected respectively with the second input of the element And and with the zero input of the third trigger, the information input of the second trigger of the first channel

connected to the first output of the switch of the last channel and to the zero inputs of the fourth flip-flops of all channels, the clock inputs of which are connected to the single input} of the second flip-flop of the first channel and to the control input of the device, the clock inputs of the device are connected to the clock inputs of the second channel triggers.

The drawing shows a functional diagram of the proposed device.

The multichannel device for controlling the order of processing requests in each channel contains the first trigger 1, element 2, the device 3 request inputs, the second trigger 4, the third trigger 5, the fourth trigger b, the switch 7, the device outputs 8, the control input 9 of the device, the input clock pulses 10 devices.

The device works as follows.

Switch 7 is designed to carry out the switching of a positive signal allocated at the output of the corresponding trigger 4 to one of its outputs depending on the state of the signal fed to its second (control) input from the output of element II 2. If the output of element 2 is the second input of the switch 7 operates at a low potential level, the latter passes a positive signal from the output of trigger 4 to its first output. Otherwise, when a high potential level acts from the output of the AND 2 element to the second input of the switch 1, then the switch 7 passes the signal from the output of the trigger 4 to its second output.

Before starting operation, the second trigger 4 of the first channel is set to one state by a pulse of the initial installation, and all other triggers are set to zero (not shown). After the initial setup pulse, the clock starts to arrive at the device 10 input. Clock pulses, acting on the clock inputs of the flip-flops 4, advance the unit from flip-flop 4 of the first channel along the ring, consisting of triggers 4 and switch 7, sequentially connected respectively. This happens as follows. The first cBoiiM clock pulse. the trailing edge switches the trigger 4 of the first channel to the zero state, since at this moment of time a low potential level acts on its information input from the first output of the switch 7 of the last channel. At the same time, the first clock pulse with its falling edge. Switches the trigger 4 of the second channel and the single state, since

This time, a high potential level acts on its information input from the first output of the switch 7 of the first channel. The next (second) clock pulse switches the trigger 4 of the second channel to the zero state, and the trigger 4 of the third channel switches to one. The next clock pulses, as described above, change the state of the triggers of the 4 subsequent channels. After switching the trigger 4 of the last channel to one state 1, the next clock pulse switches the trigger 4 of the first channel to one because the potential level from the first output of the switch 7 of the last channel acts on its information input at that time. After this cycle of progress, the unit (positive signal) along the indicated elements is repeated. Thus, in the absence of a service request from information sources, when the triggers 1.5 and 6 are in the initial state, interrogation (duty) pulse signals circulate along the indicated ring. From the above, it follows that the duration of these signals (signals at the outputs of the corresponding triggers 4 and switches 7) is equal to the clock pulse following period, and their tracking period can be several clock pulse following periods depending on the number of channels (flip-flops 4). The device is in the waiting mode for incoming requests (requests) from information sources and is ready for their maintenance. Requests from information sources may come at different times relative to each other. The signal for the signal has a pulse form and must be separated in time with a corresponding clock pulse acting on the input 10 of the device (for example, it is tied to the corresponding clock pulse of another phase of clock pulses).

Let us consider several modes of operation of the device, depending on the time of appearance of requests from information sources.

In the case when each sequential signal arrives at the corresponding input after completing the service of the previous application, the impulse request signal arriving at the input 3 of the first channel of the device switches the corresponding trigger 1 to the one state. At the output of the trigger 1, a high potential level is formed; as a result, the And 2 element triggers and at its output the low potential level changes to a high one. A high potential level from the output of the element AND 2 acts on the second (control input of the switch 7 of the first channel, thereby allowing the interrogation pulse signal (circulating around the ring) from the output of the corresponding trigger 4 to the second output of the specified switch. The ring breaks. As the information input of the trigger 4 of the second channel is affected by a low potential level, the trigger 4 of the first channel therefore switches to the zero state on the corresponding next clock pulse, and the corresponding The triggering trigger 4 of the second channel remains in the same zero state (i.e., the unit is stopped on the ring). The polling pulse signal from the second output of the switch 7 is fed to the clock input of the corresponding trigger 5. The triggering switch of the trigger 5 occurs In a single state, as a result, a high potential level (positive signal) appears on its direct output. This signal is fed to the corresponding output 8 of the device and the zero input of the trigger 1, which switches over this voltage. drove to zero. The signal from output 8 allows polling of the corresponding source of information, in this case the first one. The end of the survey of the specified channel occurs when the control pulse arrives at the input 9 of the device. This pulse must be different in time with the clock pulses acting on the input 10 of the device. It is fed to the single input of the trigger 4 of the first channel and to the synchronization inputs of the fourth trigger 6. As a result, the trigger 4 of the first channel by this pulses switches from to the single state, and therefore, the advancement of the interrogation (single) signal along the ring occurs. In addition, the control pulse with its trailing edge switches the trigger 6 of the first channel to one state, since at this time a positive signal acts on its information input from the output of the corresponding trigger 5. A high potential level is formed at the direct output of trigger b, and a low potential level is formed at its inverse output, as a result, the trigger 5 is reset to zero, and the passage of a positive signal (signal of service readiness of the corresponding subscriber) through element 2 is prohibited. The signal from output B of the first channel, enabling polling of the corresponding source of information, is removed. Thus, after completing the service of the first application, the device is ready for service of the next (second) application. All subsequent requests are serviced as described above. At the same time, elements of the corresponding channels of the device take part in the work. At the end of the service request from the last information source, the trigger 6 of the last control channel of pulses is switched to one state, and the corresponding trigger 5 is set to zero. The trigger 4 of the first channel with the specified pulse is switched to the single state, as a result, the interrogative (single) signal is successively moved along the ring consisting of the triggers 4 and KOMi tyTaTopOB. Ilpii; The appearance of the interrogation signal at the first output of the switch 7 of the last channel is reset by all the triggers 6 with the help of Tp-J: o signal to the initial one (zero), which results in a decrease. prohibition:, - (- breakdown) of the passage of the Sicmap for service readiness of information sources through the elements of AND 2. The device goes into standby mode and is ready to service the next requests. In the case of simultaneous requests for its inputs, all the first triggers 1 are switched to one state. A positive signal (ready signal) appears at the outputs of all And 2 elements, allowing the polling signal to pass to the second output of the corresponding switch 7. Since the polling signal at a given moment of time is present at the output of only one of the flip-flops 4, the specified signal will commute to the second output 7 of one of the channels of the device. In this case, the corresponding source of information will be serviced in the same way as described above. Upon completion of the service of this request, the trigger B of the corresponding channel is triggered, as a result of which the latter, using the corresponding element And 2, blocks the interrogation of the readiness of this channel until all requests from other subscribers are completed. Simultaneously with the indicated blocking, with the help of the control signal appearing at the input 9 after completing the service of the current application, one is written into the trigger 4 of the first channel. As a result, when the interrogation signal appears at the output of the trigger 4 of the next unserved channel, the specified signal will be commuted to the second output of the corresponding switch 7. The device performs servicing of the corresponding information source. At the end of the service of that subscriber, polling the corresponding channel is blocked with trigger b and element 2, and the trigger is again recorded in the trigger of the first channel, as a result, the device proceeds to service the next

for vki. Similarly, the service is performed using the appropriate channels of the device and all subsequent sources of information. At the end of the service of the last information source, similarly to the one described above, the locks are removed (the trigger triggers to the zero state) and the device switches to standby mode.

The principle of operation of the device, when it is necessary to repeatedly service one or several sources of information in the absence of service requests for other subscribers, is similar to that described above, because after completing the maintenance of the current application, the scheme of the proposed device polls the readiness of other information sources and is ready for their maintenance. If other sources of information do not need servicing, the device, as with the sequential maintenance of all subscribers, goes into standby mode. Thus, in this case, the device is ready to serve any other requisition, including a new application from the source of information that was previously served.

The technical and economic effect of the application of the proposed device consists in a significant reduction in the equipment due to the exclusion from its scheme of a large number of registers / counters and comparison comparisons, which in turn leads to an increase in the reliability of its operation. In addition, the proposed device allows servicing requests regardless of the time of their occurrence with respect to each other, which makes it possible to expand the scope of its application.

Claims (2)

 1. USSR author's certificate No. 350.005, cl. G 06 F 15/46, 1970. 2. USSR author's certificate No. 496558, .kl. G 06 F 9/00, 1974 (prototype). Oh oh 9 10