SU1118999A1 - Interface for linking informational computer system with sequential multiplexor channel - Google Patents

Abstract

A DEVICE FOR CONNECTING INFORMATION AND COMPUTING SYSTEM WITH A MULTIPLEX BY A LOW SEQUENTIAL CHANNEL, containing four elements AND, element AND-NOT, element NOT, input amplifier, output amplifier, with the first inputs of the first and second elements AND forming the information input of the device, the outputs of the third and fourth elements And they form the information output of the device, the first and second outputs of the output amplifier form the channel information output of the device, the first and second inputs of the input amplifier form channel an information input device, the input of NOT is input resolutions Display resolution transmission device, first inputs of third and fourth AND-combined and connected to the input resolutions Display resolution reception device. the second inputs of the first and second elements AND are connected to the output of the first element NAND, the first and second inputs of which are connected to the first inputs of the first and second elements AND, respectively, the output of the element is NOT connected to the third inputs of the first and second elements AND whose outputs are connected to the first and the second inputs of the output amplifier, respectively, the second inputs of the third and fourth elements And are connected to the first and second outputs of the input amplifier, respectively, characterized in that, in order to expand the field of application, A trigger, two elements OR, a NAND element are entered into the device, the first zero input of the trigger is connected to the reset input i of the device, the inverse output of the trigger is the device enabling output, the second inputs of the third and fourth elements AND are connected respectively to the first and second Inputs the first OR element, the output of which is connected to the first input of the second NAND element, the output of which is connected to the single trigger input, the direct output of which is connected to the inputs J and / (the trigger, the synchronous input of which is connected to the output in orogo OR gate, the first and second inputs connected to first and second inputs of the first 00 CO AND-NO element, respectively, resolutions Display resolution transmission device input coupled to the second input of the second AND-NO element and to a second input of the flip-flop zero. with

Description

The invention relates to digital computing and can be used in systems for collecting and processing information for transmitting and receiving digital data at exchange rates of up to 8 Mbps.

In connection with the need to increase the reliability and survivability of information computing systems, reduce the cost of their development and implementation, the cost of upgrading and modifying, recently distributed distributed computing systems with the organization of the exchange on the bus, it has become widespread. The requirement to increase the reliability of the exchange with a decrease in the energy and weight and size parameters of these systems leads to a tendency to make wide use of the exchange of bipolar phase-shift keyed code without returning to zero on the multiplex serial transmission channels. The real factor that reduces IM efficiency of using the interface is not sufficient for a number of applications, the length of the communication lines and the possible branches from it are acceptable, which requires additional costs for the implementation of retransmitting the transmitted messages.

Devices are known that contain input / output amplifiers and control input logic that provide digital reception and output. information presented in a sequential bipolar phase-manipulated code without returning to zero. These devices are designed to interface with a transformer line of a serial transmission and allow the exchange of information between the means of the subsystem and the serial digital channel 1.

The disadvantages of these devices are the limited functionality and the inability to build on their basis a bi-directional repeater of the serial channel without additional equipment costs, which limits the scope of possible applications and leads to high hardware costs, as well as additional transmission delays in the organization of long-distance channels or with topology connection other than the serial loopback connection

The closest to the invention in terms of technical dryness is the BUS-8553 transceiver, which contains four AND elements, an AND-NOT element, a NOT element, an input and output amplifiers, with the first information input of the device and the second information input of the device connected to the first inputs of the first and second And elements, the outputs of which are connected respectively to the first and second inputs of the output amplifier, the first inputs of the first and second elements And are connected to the first and second inputs of the first element AND-NOT, respectively o, the output of which is connected to the second inputs of the first and second elements I. 5 The first control input is connected to the input of the element NO, the output of which is connected to the third inputs of the first and second elements I. The first and second outputs of the input amplifier are connected to the first inputs of the third and the fourth And elements, the outputs of which are informational outputs of the device. The second control input of the device is connected to the second inputs of the third and fourth elements And, the first and second outputs of the output amplifier are the outputs of the device to the serial channel, the first and second inputs of the input amplifier are the inputs of the device from serial channel 2.

A disadvantage of the known device is that it is impossible to build a bidirectional repeater on its basis without additional costs for the equipment, which reduces the functionality of the device.

5 The purpose of the invention is to expand the scope.

This goal is achieved in that a device for interfacing an information-computing system with a multiplex serial channel, containing four elements AND, an element AND NOT, an element NOT, an input amplifier, an output amplifier and the first inputs of the first and second elements AND form the information input of the device, the outputs of the third and fourth elements And form the information

The 5th output of the device, the first and second outputs of the output amplifier form the channel information output of the device, the first and second inputs of the input amplifier form the channel information input

0 device, the element input is NOT the device transmission resolution input, the first inputs of the third and fourth elements AND are combined and connected to the input resolution of the device reception, the second inputs of the first and second elements AND are connected to the output of the first NAND element, the first and second inputs of which connected to the first inputs of the first and second elements And, respectively, the output of the element is NOT connected to the third inputs of the first

0 n of the second And elements, the outputs of which are connected to the first and second inputs of the output amplifier, respectively, the second inputs of the third and fourth elements And are connected to the first and second outputs of the input amplifier, respectively, entered

5 trigger, two elements OR, element NAND, whereby the first zero input of the trigger is connected to the device reset input, the inverse output of the trigger is the device enabling output, the second inputs of the third and fourth elements AND are connected respectively to the first and second inputs of the first element OR, the output of which is connected to the first input of the second NAND element, the output of which is connected to a single trigger input, the direct output of which is connected to inputs J and / (a trigger, the synchronous input of which is connected to the output of the second element OR, first The second and second inputs of which are connected to the first and second inputs of the first NAND element, respectively, the device enable input input is connected to the second input of the second NAND element and to the second zero trigger input.

FIG. 1 shows a functional diagram of the proposed device; in fig. 2 - use the device in transceiver mode; in fig. 3 - use of the device in the bidirectional repeater mode.

The device contains (Fig. 1) four elements 1-4 AND, two elements 5 and 6 AND - NOT, two elements 7 and 8 OR, element 9 NOT, trigger 10, output and input amplifiers 11 and 12, information inputs 13 and 14 and outputs 15 and 16, information channel outputs 17 and 18, and inputs 19 and 20 connected to the serial channel, three control inputs "Transmission enable 21," Receive resolution 22, "Reset

23and authorized, exit 24 "W.

The multiplex serial channel interface can operate in a transceiver mode as well as be used to construct a bi-directional line repeater. Turning on the device in the serial channel transceiver mode is shown in FIG. 2. In this mode, the information inputs 13 and 14 and the outputs 15 and 16 of the device are connected respectively to the information outputs and inputs of the serviced subsystem, the control outputs of which are “Transmission enable” and “Receive permission” are connected respectively to the control inputs 21 to 22 devices. To control input 23 "The reset is given a constant level of logical unit and the output

24 "U is not used. Information transfer to the serial channel via information channel outputs 17 and 18 from the information inputs of the device

13 and 14 and the reception of information from the serial channel from the information channel inputs 19 and 20 to the information outputs of the device 15 and 16 is carried out if there is respectively a zero potential at the control input 21 of the RP and a single potential at the control input 22 of the RPR.

The bidirectional line repeater is built on two devices 25 and 25 (FIG. 3), the first of which is connected by information channel inputs 19 and 20 and outputs 17 and 18 to serial channel 1 (PC1), and the second to its serial outputs channel 2 (PC2). Information outputs 15 and 16 of device 25 are connected respectively to information inputs 13 and 14 of device 25. Information outputs 15 and 16 of device 25 are connected respectively to information inputs 13 and 14 of device 25. Control input 21 and output 24 of device 25 are connected respectively to output 24 and the input 21 of the device 25. The control inputs 22 and 22 of the device are supplied with a constant level of logical one, 1, the control inputs 23 and 23 of the device 25 and 25 receive the signal Reset.

The operation of the device as part of the repeater is as follows.

The direction of transmission to the repeater is set in accordance with the moment the parcel arrives at its information inputs from the serial channel. In order to eliminate the possibility of self-excitation of the transponder when the power is turned on and there are no signals in the communication lines, high potentials are set at the outputs 24 and 24, prohibiting the transmission, respectively, to PC1 and PC2. When a parcel arrives, for example, from PC1, Trigger 10 of device 25 switches to a state where a low potential is set at the control output 24 of device 25, which allows the transmission of information 21 on channel PC2 to transmit information 21 on device 25. At the same time, the input of the installation into the unit of trigger 10 of interface 25 at the second input of element 6 AND-NOT until the end of the transmission of the parcel in this direction and the attenuation of transients in the repeater is blocked. The trigger 10 of the device 25 is reset to the initial state on the negative edge of the signal at the synchronization input of this trigger. At the same time, a high potential is established at control output 24. Conflict resolution at the parcel level is performed in the serial channel exchange protocol itself.

The known devices and the prototype device are characterized by limited functionality, namely the impossibility of building them on the basis of the additional cost of the equipment of a bidirectional repeater that is transparent with respect to the exchange protocol in the serial channel. In the pre-selected device, this disadvantage is arranged

The introduction of a rent management scheme, which is maximum 3) and does not require:. p -1n. am

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Claims (1)

DEVICE FOR CONNECTING INFORMATION-COMPUTING SYSTEM WITH MULTIPLEX NEW SERIAL CHANNEL, containing four elements AND, element AND — NOT, element NOT, input amplifier, output amplifier, and the first inputs of the first and second elements AND form the information input of the device, the outputs of the third and fourth elements And they form the information output of the device, the first and second outputs of the output amplifier form the channel information output of the mouth. The devices, the first and second inputs of the input amplifier form the channel information input of the device, the input of the element is NOT the input of the device’s transmission enable, the first inputs of the third and fourth elements are I-connected and connected to the device’s reception permission input, the second inputs of the first and second elements AND are connected to the output of the first element AND — NOT, the first and second inputs of which are connected to the first inputs of the first and second elements AND, accordingly, the output of the element is NOT connected to the third inputs of the first and second elements And, the outputs of which are connected to the first and second inputs of the output amplifier, respectively, the second inputs of the third and fourth elements And are connected to the first and second outputs of the input amplifier, respectively, characterized in that, in order to expand the scope of application, a trigger, two OR elements are introduced into the device , the AND element is NOT, with the first zero input of the trigger connected to the reset input of the device, the inverse output of the trigger is the enable output of the device, the second inputs of the third and fourth · elements AND are connected respectively with the first and second inputs of the first OR element, the output of which is connected to the first input of the second AND – NOT element, the output of which is connected to a single input of the trigger, the direct output of which is connected to the inputs J and K of the trigger, whose sync input is connected to the output of the second OR element, the first and second inputs of which are connected to the first and second inputs of the first AND — NOT element, respectively, the input for transmitting the device is connected to the second input of the second AND — NOT element and to the second zero input of the trigger.