SU1658153A2 - Priority multichannel device for interrogation servicing - Google Patents

Abstract

The invention relates to computing and can be used in an information exchange system, in particular, for organizing access to a shared device. The purpose of the invention is the expansion of the field of application due to the possibility of organizing a serial polling mode. The device contains elements OR 2. 3, pulse generator 6. registers 7, 8. decoder 11. trigger 15. delay element 12, element OR-NOT 13, blocks of elements AND 9 and OR 10, and in each channel 16 - triggers 18, 19. register 20. AND 21 block, AND 22 delay element 23, OR-NOT element 24. OR element 25 The device allows the processing of requests in the priority and sequential polling modes, and in the priority mode, the possibility of requests 1 or 2 is taken into account & about ate 00 ate (A) u

Description

The invention relates to computing and can be used in an information exchange system, in particular for accessing a public device.

The purpose of the invention is to expand the field of application of the device due to the possibility of organizing a sequential poll mode.

The drawing shows a block diagram of the device.

The device contains an element AND 1, elements OR 2 and 3, element NOT 4, input 5 of device mode, driver 6 pulses, registers 7 and 8, block of elements AND 9, block of elements OR 10, decoder 11, delay element 12, element OR 13, group of code inputs 14 devices, trigger 15, channels 16. each of which contains device output 17, triggers 18 and 19, register 20, block of elements AND 21, element AND 22, delay element 23, element OR NOT 24, element IL 25, the input 26 of the device request and the group of code inputs 27 of the device. The device can operate in one of two modes: in the presence of a logical unit at output 5, the sequential polling mode (after this service, after the spent information source is serviced, the next one is polled by the channel number); in the presence of a logical zero at output 5, the priority mode (in this mode, after the service of the spent information source is terminated, the channels are polled in a sequence corresponding to the importance of requests from information sources connected to the channels).

Before starting operation in one of these modes, the device is reset, in which the trigger 15 is in the single state, and the triggers 18 and 19 of all the channels 16 are in the zero state (the circuit for setting the device in the initial state and sources of information in the drawing are not shown). In addition, in the sequential polling mode, register 7 sets the binary code of the channel number from which to start polling via code input group 14, and the channel number code that will be polled after the given one on register 20 of each of channels 16. In the particular case on the register 7 and the register 20 of the last channel the code of the number of the first channel can be set, and on the register 20 of each of the channels 16 (except the last) - the code of the next channel by the channel number. In this case, the channel polling will occur sequentially (no-ring). Thus, the device has the ability to quickly change the sequence of polling channels, while leaving the polling frequency

channels are unchanged, or excluded from the survey a number of channels that do not receive inquiries from sources during a given period of system operation (for example, if a number of sources fail.)

0In priority mode on register 7

The code of the most priority channel (source of requests) is set in the same way, and on register 20 of each of channels 16, the code of the next channel to be surveyed 5 in the absence of a request on this channel 16 (statistical distribution of priorities). In the process, the codes on registers 7 and 20 can be changed. The code recorded on register 7 in the priority mode indicates the number of the channel to which the most important requests are received. From this channel, polling begins after servicing each subsequent request.

5After setting the initial state

device and mode of operation the device is ready to service requests.

The device works as follows.

0Priority mode At random times from sources of information, service requests are sent to the corresponding channels 16 through inputs 26 as unit levels for 5 times, followed (when dynamically distributing priorities) by channel number codes received through groups of inputs 27 and indicating the channel number, which will be polled after this if the channel does not require service at the time of the polling. When the first request is received at the input 26 of one of the channels 16, the OR 2 element is triggered, and 1 it AND gate, the output

5 of which a single level appears. On the leading edge of this signal (by the difference from a low level to a high one), the shaper of 6 pulses produces a short pulse, which, firstly, opens

0 block of elements AND 9, rewrites the code of the number of the most priority channel of register 7 through the block of elements OR 10 to register 8, secondly, entering the synchronous input of the trigger 15 by the falling edge, confirms the one state of this trigger, since its information input is set from the output of the element is NOT 4 a single signal, because the input signal 5 is set to zero (priority mode) and, thirdly, the element OR 3, having lagged (for a while

code rewriting from register 7 to register 8) on delay element 12, gates decoder 11 (opens its outputs) at one of the outputs of the decoder whose number is equal to the number of the priority itself, for example, the first channel, a polling pulse appears The channel checks for a processing request from the first source of information.

If the request at input 26 of the first channel 16 is present and therefore the trigger 18 is set to one in the first channel, then the leading edge of the polling pulse trigger 19 is set to one, at output 17 a single level appears, signaling the need to start service of a request received from the first source of information. Upon completion of the service of this request, the first source of information sets at the input 26 of its channel a zero (low) voltage level which ensures the trigger installation 18, and with its help, and the trigger 19 to the zero state. After that, the output of the element OR NOT 13, and, consequently, the second input of the element AND 1. Again reads the positive signal, which opens for the passage of i - “id, from the connection of the j or 2 P – t –... signal of this signal to the signal from the signal i (triggered by the same way and after that, the polling starts again with the m channel) And if this input is 26 of the first channel 5 h then the polling pulse from the output output - d ii | It is passed through a ps-pv channel and a delay of elements 23 delay and elements 22 and first OR 25 by opening the block Y and 21 provides a census from 0 to the first channel 16 to register 8; of the OR 10 code elements of the number of the next (second ps in) channel 16 and secondly, the OR 3 element and the delay element 12 pass and 12 ensures the formation of the second decrypter of the decrypter 11 of the impulse interrogation on the second most important kantk interrogation of the second year and cg, is similar to the description of the iv version of the device’s boom;

Thus, in priority mode, the device provides onpot, oo in the order corresponding to the frequency of incoming requests to them.

Sequential ipros mode In this mode, the first polling pulse is generated as in the npnopt get mode but

wherein the trigger 15 on the trailing edge of the pulse received from the pulse generator is set to the zero state and closes at the third input

element AND 1 Therefore, the next polling impulse is formed as follows. If the first polled channel 16 has a service request, the channel elements until the end of the request service work as in the priority mode, but at the end of the request service and at the input 26 of this low level channel eg In order to reset the trigger 19 in this channel 16, a single impulse appears at the output of the OR-NOT 24 element. First, an impulse that passes through the OR 25 element first opens the block of elements AND 21 rewrites the following code The channel to be a poll from the register 20

through the block of elements OR 10 to the register 8 and secondly passing through the element OR 3 and the delay element 12 ensures the strobing of the decoder 11 te forming the polling pulse of the next channel

If the first surveyed channel

1 didn’t have a request for the service, then it formed the next imputus opoo nooiCKO.n chuck and in j ooo chtotno - mode ms

1J o p v t g 1 b

Prioi i-anai nose. Squadron of priority L obw iv-nod a request for h i i aat f in f1 / 3 is different from what it is,

 the possibilities of opposing the mode of the optional (in; single iiipocd device j in i) (IE IE f igger A in the Element OR channel and the OR OR Ht element, and the device input is connected to the corresponding input input of the first element AND PI and which is connected to the information rocket trigger input and which is connected respectively to the output of the f impulses and to the third input of the rms And the request input of the device is connected to the first input of the element I 1 and 1 of the second RHOD of all canapos

with 4Y4-ldom of the element is NOT the third input of the element a K L AND NOT each canape is connected to and measured from the | HODOU of the second trigger of its channel the output of the element OR of the HF channel is connected to the first input of the element OR

its own, on the anal, the second input element OR channel, 1-Oed, not i with the output AND its channel element OR scratched is connected to the control input of the speaker a / k entoa. your kna / .g

Claims (1)

Mhoi .. channel ·. Priority device for servicing requests by ed. St. N ° 1568045. characterized in that. what. In order to expand the scope of application due to the possibility of organizing a sequential polling mode, the device contains an element ΗЕ, a trigger, and in each channel an OR element and an OR element. moreover, the device mode gathering is connected to the corresponding input of the first OR element and to the input of the element NOT, the output of which is connected to the information input of the trigger, the clock input and output of which are connected respectively to the output of the pulse shaper and to the third input / (. I. I. each request input of the device connected to the first input of the element OR Η E of the same channel, the second input of the elements OR-NOT of all channels is connected to the output of the element NOT, the third input of the element OR-NOT on each channel is connected to the inverse output of the second trigger hera of his channel, the output of the OR channel element is connected to the first input of the OR element of his channel, the second input of the OR element of the channel is connected to the output of the AND element of his channel, the output of the OR element of the channel is connected to the control input of the block of elements AND of his channel.