SU728122A2 - Interface - Google Patents

Description

The invention relates to the field of computer technology and can be used to interface various external devices with the input-output channel of an electronic computer. According to the author's avt. St. No. 595722, a device is known for interfacing, which contains a command register, is connected to a two-way communication with a control unit, the parity check block whose output is connected to the first input of the control block, the addressing block whose first input is connected to the second input of the control block, the sampling block, connected two-way communication with the control unit, a state registrar, the first input of which is connected to the first output of the unit is alphabeled, a state of the specified register, the input of which is connected to the second output of the control unit and a group of elements OR, the first input of the device is connected to the first input of the addressing unit, to the inputs of the parity check block and command register, the second input of the device is connected to the inputs of the sampling unit and the third input of the control unit, the third and fourth outputs of which are connected respectively to the second input addressing unit and with the first output of the device, the first exit of the state register, the second output of the unit AS), the outputs of the parity generator and the updated state register, the third input of the device through a group of elements AND And connected to the second output of the device, the first output of the register gum and the output of the sampling block are the third and fourth outputs of the device, respectively, the input of the parity generator is connected to the output of a group of OR elements, the control unit of the channel skip channel, the inputs of which are from the first to the sixth connecting with the fourth and the fifth inputs of the device, the second output of the command register, the fifth and sixth outputs of the control unit, the second output of the register, and the first, second, third outputs of the channel admission control skip control unit Inen, respectively, with the fourth, fifth inputs of the control unit and with the second input of the register c;

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A disadvantage of the known device ow etc is low reliability.

The aim of the invention is to increase the reliability of the device.

The goal is achieved by the fact that the device according to auth. 595722 an odio-multiple information transfer unit is entered, the first input of which is connected to the fourth input of the device, the second and third inputs are connected respectively to the second output of the command register and to the F1 bus and the output is connected to the first input of the channel skip control unit.

The drawing shows a block diagram of a device that contains a command register 1, a control unit 2, an addressing unit 3, a block 4, a unit 5 for channel skip control, a state register 6, a state register 7, a parity generator 8, a sampling unit 9, the unit of single information transfer 10, a group of elements OR P, information and control buses of channel 12, buses of control and information signals of subscriber 13, bus Buffer ready 14, bus End of transfer 15, buses of control and information signals of external device 16, control conductive bus 17.

The device works as follows. In the initial state, the command register I, the state register 6 and the updated state register 7 are zero, h

In the absence of a channel access to this device, the triggers of the control unit 4, the unit 5 of the control of channel access skip, the unit 10 of a single information transfer are in the zeroed state. The detuning bus 17 receives the prohibition of the operation of the unit 10 for transmitting information once, but the Buffer signal is ready from the bus 14 through the indicated LFO to the input of the channel access control skip unit 5.

Initially, after starting the programs for inputting information into a multiplex channel, communication with an external device is initiated by the channel. ..

 The entry of information begins with the initial sampling operation. At the same time, the channel sends out the external device’s external bus with the corresponding control signals, and the addressing unit 3 and the sampling block 9, identifying the address code, through a group of elements OR 11, place their address code on the subscriber’s bus signals. and corresponding signals indicating that the channel has been connected to the devices. The control unit 2 monitors the incoming information.

The channel, having received a response ID, enters a command to Count, which is stored in the command register 1, and the control unit 4 outputs from the state register 6 a zero byte through the element group OR 11 and the corresponding identification signals to the control buses of the channel 12. After whereby the initial sampling operation ends and the channel is released to work with another external device.

The signal from the bus Buffer is ready 14 through the block of information transfer 10 and the block of control of channel 5 skip, goes to control block 4, which generates a signal subscriber requirement: to transmit information and generate sequences of signals entered by the subscriber to transmit information. After the last byte of information is transmitted from the information signal buses of the external device 16 via the element group OR 11 to the subscriber information signal buses 13, the control unit 4 inserts the corresponding bits of state register 6 or updated state register 7, signaling the end of information transfer and the channel forms a signal The end of the transfer and other signals of the sequence of an I / O operation with this device until the next Read command. When issuing information to form a parity bit, a parity generator 8 is used in conjunction with a group of elements OR 11.

If the Read channel command was not issued, but the Buffer 1 signal came from the external device, control unit 4 sets the corresponding bit in state register 6 and sets the subscriber's signal to send the state, thereby reporting the need for urgent information transfer.

If between two consecutive signals the Buffer is ready, the channel did not have time to generate the Read command, then the control unit of the skip access 5 generates 6 bits in the register so that it signals the flow of information.

The operation of the unit of one-time information transfer consists in controlling the switching of the modes of operation of the device. When applying to the bus 17 permission of the unit of a single transmission of information 10, it generates a ban on the passage of subsequent signals to the block of scrolling channel 5.

Claims (1)

Thus, the communicator in this case generates only one signal. The subscriber's requirement to transmit information or state, and the following requests can be made only after the permission of the unit for single information transfer is removed and it is reset. Claims Device for coupling rio auth. St. N 595722, characterized in that, in order to increase the reliability of the device, a unit for transmitting information is inserted into it, the first input of which is connected to the fourth input of the device, the second and third inputs are connected respectively to the second output of the command register and to the control bus, and the output connected to the first input of the control unit for skipping channel. Sources of information taken into account in the examination I. USSR author's certificate N 595722, cl. G 06 F 3/04, 1976 (prototype). WU /,