SU1062681A2 - Device for information exchange among digital computer and peripheral units - Google Patents

Abstract

DEVICE FOR INFORMATION EXCHANGE BETWEEN DIGITAL COMPUTING MMOIN AND OUTDOOR DEVICES according to aut. 907537, characterized in that, in order to reduce hardware costs by reducing the number of communication lines, an address encoder and N external request selection blocks are entered into it, each of which contains two AND elements, a delay element and an NOT element, and in 1 m block selection of inquiries

Description

The invention relates to computing and can be used in computing systems.

According to the main auth. No. 907537, a device for exchanging information between a digital computer and external devices, comprising an information register, a synchronization unit, an encoder, an OR element and a D exchange channel, each of which contains a channel preparation unit, a request processing unit, a control unit, word and current counters. the addresses, the information input and output of the information register are respectively the information input and output of the device, and the control input is connected to the synchronization input of the device and the input of the synchronization unit, each The exchange channel of the group of inputs of the query processing unit is connected to the output group of the synchronization unit, the first input is the corresponding input from the input request group of the device, and the first, second and third outputs are connected to the first, second and third inputs of the control unit, the fourth input is, respectively, the input from the group of inputs of the device transmission direction, the first output is connected to the corresponding output of the group of the device polling outputs and the input from the first group of inputs of the synchronous block and the fifth input is with the first output of the channel preparation unit, the first input of which is the input from the group of inputs of the device start attribute array, the input group of the channel preparation unit is connected to the input group of the control unit and the output group of the synchronization unit second and third inputs and the first and, the second outputs - respectively with the first and second outputs and the third and second inputs of the request processing block, the fourth input of which is connected to the input of the sign of working out the programmed command device, the third output block channel preparation is connected to the first inputs of the current address and word count counters, the second inputs of which are connected to the second output of the control unit, the third output connected to the third input of the current address counter, the encoder's output group and the output group, the current address addresses of the exchange channels are non-programmed output groups In this device, the first group of inputs of the encoder is connected to the second group of inputs of the syncronization unit and the group of inputs of the indication of the transmission direction of the device, the second group in odov - a fourth output channel training blocks.

and a third group of inputs. with the first outputs of the request processing blocks and a group of inputs of the TEM element, the input groups of the word word counters and the current address counters are connected to the group of information inputs of the device's widgets, the output of the OR element is the output of the device program pause sign, the fifth input of the request processing block exchange (il, N) is connected to the first output of the request processing block of the i -th channel. exchange flj.

The disadvantage of the device is the high cost of the equipment due to the large number of communication lines with external devices. In this device, external devices are connected to each communication channel via four communication lines. With an increase in exchange channels, the number of communication lines increases proportionally. Since the organization of interface of the known device with external devices is provided by means of trunk transmitters, receivers and cable communication lines, these circumstances entail a significant increase in the equipment of the computing system with an increase in the number of external devices.

The aim of the invention is to reduce hardware costs by reducing the number of communication lines between the device and external devices.

The goal is achieved by the fact that the address encoder and N blocks for selecting extralegal queries are entered into the device, each of which contains two AND elements, a delay element and an NO element, and in the -th external request selection block (., N) the first input of the first AND element connected to the th input of the device request, to the input of the delay element and through the element NOT to the first input of the second element And the output element, that delay is connected to the second inputs of the first and second elements And, the outputs of which are connected respectively to the first inputs of the block Cooking channel and query processing unit i-th channel, a first output control unit i -th channel connected to (--m encoder input address whose group address output is the output device.

Figure 1 presents the block diagram of the device; Fig 2 is a block diagram of the selection of external requests; on fig.Z. a temporary chart of his work; Figo4 diagram of the synchronization unit; figure 5 - the timing diagram of his work; in fig. 6 shows diagrams of a semi-subunit unit, a request processing unit and a control unit. The device contains (Fig. 1) an I external request block, an address coder 2, an information register 3, a synchronization unit 4, a coder 5, an OR element b, exchange channels 7, each Each of them contains a channel preparation block 8, a query processing block 9, a control block 10, a word count counter II, a current address counter 12. In Fig. 1, the code reception bus 13 in the counters is also designated, the sign 14 of the unprogrammed I / O command (PKBB-B), the counter modification bus 15, the bus 16 per. control word millet, lockout 17, bus 18 for generating a code receiving signal into counters, control bus 19, issuing bus 20. the code of the current address counter, bus 21 with the sign of working off an unprogrammed command, bus 22 of the output group of an unprogrammed device command, bus 23 forming the Start signal, bus 24 forming the request signal, 25 characters: control word, wide 26 interrogating external devices . The BLOCK 1 of the selection of external requests contains (FIG. 2) a delay element 27, a NOT element 28 and AND elements 29 and 30. The synchronization unit 4 contains AND 31-34 elements, an AND-OR TH element, an OR element 36, a trigger 37, a counter 38, the distributor 391 pulses, the generator 40 (figure 4). Channel preparation block 8 contains (6) triggers 41 and .42, elements And 43-45. The request processing unit 9 contains (FIG. 6) the triggers 46-49, the AND elements 50-52, the HE element 53. The control unit 10 contains the (FIG. 6) AND 54-57 elements, the OR element 58, the HE element 59.. The device works as follows. To ensure the operation of the device, each channel in the memory (RAM) of the digital computer is assigned a cell in which the channel control word is stored, which contains the characteristics of the transmitted information array (the number of words and the initial address). From the external device (VU) n the inputs of the encoder b and block 10 outputs from the potential of the PVV-B, which determines the direction of transmission of the array of information (from the RAM of the digital computer to the VU, or vice versa). The channel preparation for the exchange and control of the rate of transmission of individual words of the array is carried out by signals of external queries Ex. Sn, which come from WU to the input of unit 1 of the corresponding exchange channel. The request signal for preparing a channel for exchange is different from the request signal for transmitting the next word in an array of information of its own duration. Selection of the request signals is carried out by block 1, which from the incoming signal generates either the signal of the head of the array, which prepares the corresponding channel for the exchange, or the request signal, which initiates the transmission of the next information word. The Start signal; the array is formed in block 1 at the output of the AND 29 element, to the first input of which an external request signal is received directly, and at the third input, being delayed at the delay element 27 by the t-joiA value, the Request signal is generated at block 1 on the output element And 30, to the first input of which the signal of the external request enters through the element NOT 28, and to the second through the delay element 27 delayed by the amount of the Delay time of the signal at element 27 must be oiA 3n - where T, j, is the signal duration -. pros; u is the maximum signal expansion request when it is transmitted over a cable line. In this case, the duration of the signal of the beginning of the array at the input of block 1 should be T j. lnm -Hw ad + yc, where t is the minimum permissible duration of the signal on bus 23. From the point of view of the simplicity of the formation of the ext. signal in the external device, it is advisable to accept. Signal Ex.W. (of the Beginning Array type) through block 1 via bus 23 enters block 8, where it is detected by triggers 41 and 42. The same signal from bus 24 goes to block 9 and fixed there by trigger 46. The output potential from the zero output of trigger 42 on the AND element 50, the output signal of the trigger 46 is blocked, and the control signals are not allowed to go off by the block 10. The potentials from the single outputs of the flip-flops 41 and 42 through the And 44 element set the trigger 47 to the one state and through the And 51 element (if present at its second input the potential of the channel is higher a priority level) a signal is issued. which blocks the operation of lower priority channels, enters the encoder 5 input and through the element OR 6 enters the digital computer as an external request of the Suspend type. At the same time, the Signal, NKvv-B signal on the And 4 element generates a Pohl signal arriving at the encoder 5, at the output of which an unprogrammed control word output command is generated, which follows the buses 22 to the input of the digital computer. After receiving an external request from the digital computer via bus 21, a signal is issued to the NC “T”, and by the group of information buses Inf. DVR issued control word. Ikotrab signal. Signal CNK signal is allowed to be recorded through AND 52 in trigger 48 and then in trigger 49, and also allows for resetting trigger 47. Both element 52 and triggers 48 and 49 provide for delay and synchronization with the external request digital clock ticks. The output signal of the trigger 49 on the element And 45 forms the signal PKSg. - and flip-flop 42 is reset, and flip-flop 47 is reset by the output signal of trigger 1 48. A pCSg signal on bus 13 causes the control word to be written to counters 11 and 12. After resetting flip-flop 42 to flip-flop 47, the request 50 rewrites through the element 50, Fixed 1G:, 1st in trigger 46, and then on element 51, a Sighi, HKvv-B signal is generated (if there is an enable signal from the highest priority channel at its first input). This signal enters blocks 9 of all channels of a lower level of priority and blocks their operation. Simultaneously, the signal of Signal NCVV-B is sent to the encoder 5 in the digital computer (as a signal for Suspending of breakouts, such as the input of block 10, on the And 57 element of which a signal is generated: BKCt- i providing the output of the address code Negrg mg from the counter 12 to the input of the digital computer command, the operation code of which comes from the output of the encoder 5. After receiving the code of the unprogrammed command in the CAM, the output signal from trigger 48 on the element and 56 generates a signal + ic, which increases the unit code in counter 12 and decreases by one code in the counter 11, i.e. produced Preparing the counters for transmission of the next word. After the reception of an unprogrammed command, the digital computer produces the output (if the PVV-B corresponds to the output) of the first word of information, at the same time with which on the elements 54 and OR 58 of the block 10 the direction is formed and issued signal Interrogation of the VU arriving in 1iine 26 to the input of the encoder 2, with which this signal is encoded, and on the group of buses the Interrogation Code of the VU address, output, the VU code enters the external device. When entering information into the RAM of the digital computer from VUA elements And 55 and OR 58, a synchronization signal is generated Poll WU, which is encoded on encoder 2, and this code enters the corresponding information sensor. The sensor hardware decrypts the code and transmits the information on the buses Inf. WU at the input of register 3 information, Information from WU is accompanied by a Sync signal. WU, which this information is recorded in the register 3 and from it is taken to the RAM of the computer. The time between the issuance of the VU Interrogation Code to the sensor and the receipt of information from the sensor should be no more than a certain fixed value (with the accepted time ratios, this value is seven working cycles). If after a set time from the sensor did not receive information (due to the greater distance to it, its low speed, etc.), then there is a mismatch between the timing diagram of the digital computer and the operation of the VU. Vlok 4 synchronization (figure 4 and 5) works as follows. In the initial state, the counter 38 and the trigger 37 are set to the zero state. Potential from the outputs of the trigger unit 37 through the AND 34 element allows the flow of GI 2 pulses from the output of the generator 40 to the input of the distributor 39 pulses, and through the And 33 element the receipt of pulses to the input of the counter 38 is prohibited. Thus, in the initial state at the output of the distributor 39, a sequence is formed TI1-TI8 clock signals with a repetition period determined by the period of the output signals of GI1 and GI2 of generator 40. At the same time, clock signals with even numbers are formed from GI2 pulses, and odd-numbered - from GI1 pulses. In this mode of operation of the block, all operations of the digital computer are performed with the exception of input operations. In the operation of non-programmed input, information at the input of a digital computer should be installed no later than TI2 pulses. Signs of the transmission of information PVV-B on the elements And 31 and 32 allow the passage of the ignore poll WU, which, having been probed through the OR element 36, sets in one state the trigger 37, disconnecting from the distributor 39 pulses the clock signals GI2 and connecting them to counting input counter 38. At the same time

the last at the output of the distributor is the clock pulse of TI 5. Trigger 37 is reset by the Sync. VU signal, which is probed on the AND-OR element. 35 by the sync signal.

After resetting the trigger 37. At the distributor input through the element 34, the GHZ clock pulses are allowed, and the distributor generates the clock pulse TI6 and all subsequent ones. Thus, the duration of the cycle TIB corresponds (Fig, 5), t, e. the operation of the pulse distributor 39 is suspended for the time of polling the information sensor and is triggered when input information is set at the input of the digital computer. Since the trigger 37 is reset by the Sync signal, the slave generated in the slave, and before the arrival of this signal the digital computer operation is actually suspended, there is a danger of the digital computer stopping if one of the main devices or the transmission line of this signal between the remote controller and the digital computer fails. the GI2 sync signals from the moment of issuing the signal from the unit 10 Poll to the VU and until the Synch, VU, Counter capacity is received from the VU. The capacity of the counter is calculated for the maximum exchange time,

If during this time the sync, wu signal is not received from the slave, then the trigger output resets the trigger .37, the pulse distributor 39 is restored, and the information input operation from the faulty sensor ends with a zero code, e, e, the faulty sensor information accepts,

Thus, the number of lines of communication in the device is substantially less than in the known. The reduction of communication lines leads to a reduction in the hardware of the computing system by reducing the number of trunk transmitters and receivers, while reducing the number of wires in cables leads to a decrease in the cost of the cable network of the computing system.

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Claims (1)

DEVICE FOR EXCHANGE INN. FORMATION BETWEEN THE DIGITAL COMPUTER MACHINE AND EXTERNAL DEVICES according to ed. No. 907537, characterized in that, in order to reduce hardware costs by reducing the number of communication lines, an address encoder and N external request selection units, each of which contains two AND elements, a delay element and a NOT element are introduced into it, and in < -th block of selection of external requests (<-1, H) the first input of the first element And is connected to the i -th input of the device request, to the input of the delay element and through the element NOT to the first input of the second element And, the output of the delay element is connected to the second inputs of the first and the second element And, out s which are respectively connected to first inputs of block channel training and query processing unit <th channel, the first control output <th channel unit is connected with i-th input of the encoder address $ group which is addressable outputs output device. i "ur ^ra ns