SU1411746A1 - Cyclic priority device - Google Patents

Abstract

The invention relates to computing technology, in particular, devices for priority service of requests, and can be used in multiprocessor computers and information computer systems for servicing user requests for a data transmission line and other shared resources. The purpose of the invention is to increase the speed of the device due to parallel analysis of queries. The cyclic priority device contains a register, an element, NOT and two query analysis nodes, each of which has two groups of elements NOT, Two elements AND, (N + 2) - groups of elements AND (2N is the number of device's request inputs), a group of elements OR- NOT, element ISH-NOT, element of isolation. The device allows you to service requests both in cyclic mode (then in each cycle of the device, the request code received for service is entered in the register) and in the priority mode (the information in the register does not change}. 1 Il, 1 table . (L with:

Description

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The invention relates to computing technology, in particular, devices for priority service of requests, and can be used in multiprocessor computers and information computer systems for prioritizing the maintenance of subscriber requests for a data transmission line and other shared resources.

The purpose of the invention is to increase the speed of the device, due to the parallel analysis of queries.

The drawing shows a functional diagram of the device.

The device contains the register 1, the element NOT 2, the nodes 3 and 4 of the query analysis, the first group of elements NOT 5, the second group of elements NOT 6, (K + 2 -) - the group of M elements And 7, the first and second 9 elements And , (Nl) groups of (Ni) elements And 10 in the i-th group, N-th group of tU-l) elements And 11, (N + l) -ro group of N. elements I-1.2, element OR- NOT 13, a group of (M + 1) elements OR-NOT 14, an element of 15 isolations, (M logjN).

In the drawing indicated the request. device inputs 16, address inputs of 17 query analysis nodes, device address output 18, device information output 19, first 20, second 21 and third 22 information outputs of query analysis nodes.

The device provides a cyclic service mode for the sources of requests and a priority service mode.

For both modes, the value is current. priority code arriving at address inputs 17 in nodes 3 and 4 of query analysis from register 1 outputs, determines the order of priority distribution over request inputs. If the value of the current priority code is Ae {0,2N-l}, then the numbers of the request inputs in order of decreasing their priorities (priority pd) are as follows: A + 1, A-2, ..., 2N

If, then the priority series has the form 1,2, ..., 2N; if, priority priority has the form of 4,5,6, .. ,, 2N,

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As a result of the operation of the device, the resolution will be given to the request input, which has the highest priority among the inputs that set the request signals.

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owls In this case, a logical zero appears at information output 19 (indicating the presence of at least one request at the Device inputs), and a binary number will be generated at the device's address output 18, corresponding to the number of the input that received the service permission. In this case, the inputs with numbers 1 - (2N-1) at the output 18 of the device correspond to the number 1 - (2N-1), and the input with the number 2N - the number 0.

In the priority service mode, the register I records the value of A, which does not change during the operation of the device and determines the constant prioritization of the request inputs.

In the cyclic mode of operation, the contents of register 1 are updated in each clock cycle of the device. The number of the input that received the permission to service in the current clock from output 18 is entered into register 1 by a clock clock (not shown), which ensures the redistribution of priorities in the subsequent clock cycle. At the same time, the request input that received the resolution in the previous cycle is also assigned the lowest priority in the next one.

The device provides a cyclic maintenance mode, ensuring that the input that has set the request signal is allowed no more than through 2N-1 device operation cycles. . The device works as follows.

There are three selection schemes in each query analysis node. The first consists of elements And 10, a group of elements And 7 and an element And 8. The second and third selection schemes consist of elements And 12 and 11, respectively.

When O, the device operates as follows.

Since A I5, then the (M + 1) -th bit of the address input of the 17. query node 3 is equal to one, and node 4 of the query analysis is zero. These signals, respectively, arrive at the inputs of all the elements And the first selection schemes of nodes 3 and 4. As a result, the first selection scheme of node 4 is closed, and the first circuit of the analysis node 3 is enabled. In addition, the specified value (M + 1) -th bit closes tre3i

This is the analysis scheme for node 4 analysis and the second scheme for analysis node 3 analysis.

The first node selection scheme 3 selects the query with rfiaHMeHbraHM number k from the range А k N, the second node 4 selection scheme from the N range - k 2N, and the third node 3 selection diagram from the 1 k A range,

If there is a value of k from the range A k, then a single signal appears at the output of at least one element AND of the first selection circuit. This signal is fed to the input of the element OR NOT 14, which leads to the appearance of a zero signal at the information output 20 of the analysis node 3. This zero signal is fed to the inputs of all elements of the second and third comparison circuits of both nodes, closing them. Thus, the inputs of the elements OR-NOT 14 of both nodes receive a single single signal from the output of the AND element only from the first selection circuit of the analysis node 3. According to the described links, this leads to the appearance of the code k at the address output 18 of the device.

If the value of k in the range is absent, then the first choice of node 3 is closed.

Suppose that the value of k belongs to the range 2N. In this case, the output of the AND 9 element of the query analysis node 4 is a logical zero, which closes the third node 3 selection scheme. Thus, the only scheme that produces a single signal at its output is the second query analysis node 4 selection scheme. This single signal leads to the appearance at the address output 8 of the device of a code corresponding to the request with the number k.

In the case when the value of k does not belong to the range A k. $ 2N, the output of element And 9 of node 4 will be a logical one, and the third selection scheme of node 3 becomes the only selection scheme that is ready for operation. When a request with the number 1 k A appears, the output of the k-ro element And 11 of node 3 is a single signal that leads to the appearance of the code k at the address output 18 of the device.

In the case: when there are no requests at the device inputs, there will be a single signal at the device information output 19.

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In the case of NL 2N, the first query analysis node selection scheme 4 selects a query in the A range. If there is no request from such a range, then the second scheme for selecting node 3 performs a search in the range of 1 k N. If there is no request in this range either, then a third

Q Node selection circuit 4 searches for a query in the range N + 1 k A.

The connections between the elements in the device are shown in the table.

PRI me R. A code is received from the register, and requests are received at the first and tenth inputs. J, Since A N, then the first and third schemes for selecting the analysis node 3 and the second scheme will have a work permit

Q of node selection 4. However, since the request with number k in the range of k is missing, none of the elements of the first selection scheme works. And since the request arrived at

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the output of the element And 9 of node 4 will be a logical zero, which terminates the third choice of the node 3 analysis queries.

Q Thus, a single signal will be only at the output of the tenth element AND the second selection scheme of the Node 4 analysis. In accordance with the established connections, this signal is sent to the outputs of the first and third elements of the Group-HE 13 of group 13, which leads to the appearance of code 10102 10, at the address output 18 of the device.

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Claims (1)

 Invention Formula A cyclic priority device containing a register, the information inputs of which are connected to the device address rpyit, which is because in order to improve speed by parallel query analysis, the device contains an HE element and two query analysis nodes, each of which contains the first group of elements NOT (2N is the number of request inputs of the device), the second group of (M + O elements NOT, (N-1) group by (Ni) elements And in the i-th group (1 l, ... , Nl), the first and second elements And, the N-th group of (Nl) -ro element And, (H + -th group of the N AND gates and (K + 2) th group of M elements and, : an OR-NOT element, a group of the (M-I) -th element OR-NOT, an isolation element, with the kth request input (, .., N) of the first query analysis node being Km, and k The -th request input of the second query analysis node is; (N + k) -M by the device's request input, j the k-th request input of each query analysis node is connected to the input k-ro I of the element NOT of the first group, the jth request input (, ..., N -2) the query analysis node is connected to the (M + I-1) th (..; 5J) input of the 1st element AND 1 (-1 + 1) -th group (, with j.const,) , {output of the j-ro element of the NOT of the first group I is connected to the (M + 1 + 1) th input of (l + l) -ro and all subsequent elements of the And (j-f-l + 1) -and group (i const ), the output of the (I-1) element, NOT the first group is connected to the (N + M-i + l) -My input of the Idu (Ni) -ro element I and the i-th group, the N-th device request input connected to (M + N-i + 2) -My input (Ki) -ro groups, the second inputs of all-elements and N-th group are connected to the first information input of the query analysis node, and the third inputs of all elements of the N-th group are connected to the second information input of another query analysis node, the i-th request input of the query analysis node is connected to ( 3 + 1) th 10 to the input of the i-ro element AND the Nth group, the output of the j-ro element NOT the first group is connected to the (3 + j) -My input (j + 1, ..., (Nl) -ro elements AND the Nth group , the output of the (M + 1) -th element of the NOT group of the second group is connected to the first, and the first information input of the query analysis node - with the second inputs of all elements of the AND (H + 1) -th group, the k-th query input of the query analysis node under 20 is connected to the (2 + k) -My input of the k-ro element of the AND (M + 1) -th group, the output of the i-ro element of the NOT of the second group is connected to the (, 2 + 1) -th input of (J + I) ,, .., N-ro, elements AND (N + l) -th group, output (N-S + O-rc of the element AND the 1st group and (M + 2) -th input- 25 (, .., N) of the element AND the i-th group .. - l. ™, T1 / -lt 1 .. .. “-, - / P 1.1.l g / g. About i the first element I, and (K-1) -th request input - to the third inputs of all elements AND (N + 2) -th group, (m +) - output of the current priority register is connected to the input of the element NOT and to (M +1) th address input of the second query analysis node, the output of the element is NOT connected to the (M + 1) th address input of the first query analysis node, thirty connected to - (2 k + cr (S-i) + + 1) -th input of the i-th group of inputs of the m-th element OR-NOT group (k (S-i), lgt G O, X cfLXJ | j, J.-7 / OJ representing the number (S-i) in the form (S-i) I-i-i-2 ° di + 2 d2 + ... + value, output (N-i) -ro of the element And the i-th group is connected to the i-th input (K-1) -th group (, ..., N) the output of the current-p register. The inputs of the m-th element OR-NOT, outgoing priority are connected to the m-elements of the ad-first element AND connected by the corresponding inputs of the first and second, respectively, to the Nth input of the (I-1) -th analysis group requests, groups ga-x and py inputs of the t-th element OR-NOT, output; (M + 1) -x address inputs of all nodes. Da (N-i) -x elements AND N-th and (W + 1) -th query analysis are connected respectively to the inputs of the t-th and (M + 1) -th elements of the NOT-second group, the th address input of the query analysis node is connected to the th inputs of all AND elements 40 (), ..., () -x groups with measures smaller than N, (, ..., N2) and to the w-th input of the first element I, the output of the w-th element NOT the second group is connected to the t-m inputs of all elements and (), ... , (groups, the output of the m-th element of the second group is connected to the second input of the m-th element of AND (K + 2) -th group, (M + +1) -th address input of the query analysis node is connected to (M + 1) -m inputs of the element And the i-th group (,,., N-1), the first element And, with the first inputs of the elements And (N + 2) -th group-and with the first inputs of all elements And N-th groups are connected respectively to (2 - -l + Dr i-12 -2 + n) -My input Nth and to (l + 2 - -l + i-12 -2 V) -My input (W + 1) - groups (where) of inputs of the m-th element of the ILIZH group, if in the representation of the number i as  i i + 2 d + 2 d +. .. + 2 dM value d 1, the output of the N-ro element of AND (W + 1) -th group is connected to the first input of the (N + l) -th group of inputs of the t-th element 50 OR NOT, the output g-ro (, ..., Ni) of the element AND the i-th group is connected to the g-th input of the 1st group of inputs (M + 1) -th element OR-NOT group, the output of the first element And connected to the NM input 55 (K-1) -th group of inputs, and the output of the m-th element of the AND (K + 2) -th group is connected to the th input of the N-th group of inputs of the (M + 1) -th element of the OR-NO group, koto output 11746 groups, the second inputs of all-elements and N-th group are connected to the first information input of the query analysis node, and the third inputs of all elements of the N-th group are connected to the second information input of another query analysis node, the i-th request input of the query analysis node is connected to ( 3 + 1) th 10 to the input of the i-ro element AND the Nth group, the output of the j-ro element NOT the first group is connected to the (3 + j) -My input (j + 1, ..., (Nl) -ro elements AND the Nth group , the output of the (M + 1) -th element of the NOT group of the second group is connected to the first, and the first information input of the query analysis node - with the second inputs of all elements of the AND (H + 1) -th group, the k-th query input of the query analysis node under 20 is connected to the (2 + k) -My input of the k-ro element of the AND (M + 1) -th group, the output of the i-ro element of the NOT of the second group is connected to the (, 2 + 1) -th input of (J + I) ,, .., N-ro, elements AND (N + l) -th group, output (N-S + O-rc (, .., N) element And the i-th group .. .. "-, - / P 1.1.l g / g. About i connected to - (2 k + cr (S-i) + + 1) -th input of the i-th group of inputs of the m-th element OR-NOT group (k (S-i), lgt G O, X cfLXJ | j, J.-7 / OJ representing the number (S-i) in the form (S-i) I-i-i-2 ° di + 2 d2 + ... + value, output (N-i) -ro of the element And the i-th group is connected to the i-th input (K-1) -th group groups are connected respectively to (2 - -l + Dr i-12 -2 + n) -My input N-th to (l + 2--l + i-12 -2 V) -My input (W + 1) -th groups (where) of the inputs of the m-th element of the ILIZHZH group, if you are in the representation of the number i as i i + 2 d + 2 d +. .. + 2 dM value d 1, the output of the N-ro element of AND (W + 1) -th group is connected to the first input of the (N + l) -th group of inputs of the t-th element OR NOT, the output g-ro (, ..., Ni) of the element And the i-th group is connected to the g-th input of the 1st group of inputs (M + 1) -th element OR-NOT group, the output of the first element AND connected to the NM input (K-1) -th group of inputs, and the output of the m-th element of the AND (K + 2) -th group is connected to the m-th input of the N-th group of inputs of the (M + 1) -th element of the OR-NOT group, the output of which is 714 pogo is the first information output of the query analysis node; in the second query analysis node, the output (Ni) -ro of the element AND of the i-th group is connected to the i-th input of the W-NOT element of this node, the output of the first And element of the second node is connected to N- mu input element OR NOT, output N-ro element AND (N + l) -ft group is connected to (N + l) -My input element OR-NOT, in the first query analysis node output h-ro (... , NJ-1) of the AND element in the j-th group (h, var, v J, const3 is connected to the h-th input of the j-th group of inputs of the OR-NOT element, the output of the th-th element AND (K + 2) -th the group is connected to the th input (Nl) -ft of the element input group That OR - NOT, the outputs of the ix elements of the Nth and (H +) --th groups are connected to the i-th input of the Nth and (H + 1) -th groups of the inputs of the OR-NO element, respectively, in each query analysis node the output of the k-ro element of the NOT of the first group is connected to the k-th input of the second element I, the output of which is connected to the input of the element times 117468 visually and is the second information output of the query analysis node, the output of the isolation element is the third information output of the query analysis node, the first information outputs of the query analysis nodes are interconnected through installation AND and connected to the first information The 10 inputs of both query analysis nodes, the third information outputs of the query analysis nodes are interconnected through mounting AND, and is the information output of the device, the outputs of the OR-NOT elements of the analysis nodes are interconnected via mounting and connected to (M + 1) - The current priority register information input is the (M + 1) th bit. The 20 address output of the device, the outputs of the mx OR-NOT elements of the groups of both analysis nodes are interconnected via mounting AND, connected to the m-th information input of the register 25 of the current priority and are the m-th device address output  {Yes, voyage. (Iodod iivrvtora) with lsh "e1ggom; " eleven /and / 7 one ff Jl AT u about 7 / TO 1Z 22 five 2G yy