SU552603A1 - Device for interfacing external devices with an I / O channel - Google Patents

Description

one

The invention relates to the field of computing and can be used for input - output information.

A device 1 for interfacing external devices with an I / O channel is known, comprising a control unit, a synchronization unit, a mode decoder, a comparison circuit, a shift register, a modification register, a trigger, an OR element, a discharge valve, a receive valve, a discharge permit valve, a release valve receiving, receiving valves modification bits.

The disadvantage of the device is that it requires increased equipment costs and does not have a sufficiently high speed.

The closest to the invention in technical essence and the achieved result is a device 2 for interfacing external devices with an I / O channel, containing a communication unit with an I / O channel, the first input and output of which are connected respectively to the first input and output of the device, register control input associated with the second output of the communication unit with the I / O channel, the command analysis unit whose input is connected to the first output of the control register, the first data register, the first input connected to the second the output of the communication unit with the input / output channel, the second data register, the input of which

It is connected with the output of the first data register, and the output with the second input of the communication unit with the I / O channel, the communication unit with external devices, the first input of which is connected to the second output of the communication unit with the I / O channel, with the first and second control register outputs and the output of the second data register. The first output, the second input and output of the communication unit with external devices are connected respectively to the second input of the communication unit with input / output channel, with the second input and output devices.

A disadvantage of the known device is the provision of direct and simultaneous communication of no more than two external devices, which reduces the capacity of the device and reduces its functionality. . The purpose of the invention is to increase the throughput

capabilities and enhanced device functionality.

This is achieved by introducing a counter, a state byte generation unit, a local memory block, an address memory block, a free zone search block, and a monopole determination unit and issuing identification signals. The first inputs of the search unit for the free zone and local memory are connected to the output of the address memory block, the first, second and third inputs of the address memory block, respectively, to the second output of the control register, to the third output of the communication unit to the I / O channel and to the output the free zone search unit, the second input and output of which are connected respectively to the third output of the control register and the first input of the local memory block, the second input and output of the local memory block to the output of the second data register and the third input respectively first data register. The first, second inputs of the block for determining the monopolistic mode and issuing identification signals are connected respectively to the first input and the first output of the communication unit with external devices, the first, second and third outputs of the block for determining the monopolistic mode and issuing identification signals are respectively to the second input and output of the block zy with the I / O channel and with the control inputs of the first and second data registers. The third output of the control register is connected to the input of the counter, the output of the counter and the output of the command analyzer are connected to the inputs of the state byte generating unit, the output of which is connected to the second input of the communication unit with the I / O channel. The block diagram of the device shown in the drawing.

The device for interfacing external devices with an I / O channel contains a communication block 1 with an I / O channel, a control register 2, a free zone search block 3, a command analysis block 4, data registers 5, 6, an address memory block 7, a block 8 local memories, counter 9, state byte generation unit 10, unit 11 for communication with external devices, unit 12 for determining monopolistic mode and issuing identification signals, inputs 13, 14, outputs 15, 16.

The device performs all input-output operations defined by the command system of a unified system of electronic computers (EC computers).

Standard input / output operations are defined by the following commands: read, read in the opposite direction, write, control, check status, check input / output.

These commands are not recognized by the device and are transmitted from the I / O channel to external devices without any additional action. In addition, the interface device can directly communicate between any pair of external devices (in particular, the communication channels of the data transmission multiplexer) connected to the interface device, without exchanging data with the input / output channel. The initiation of direct communication is carried out by an input / output channel by transmitting the following modifications to the device: read, read in the opposite direction, write, control.

These commands are recognized by the interface; the command bit indicating the direct connection is memorized, it determines the particular course of the operation and is not transmitted to the external device.

The operation of the interface device when executing standard commands is as follows.

An input / output drip initiates the operation of the device by issuing a sequence of initial sampling signals. The address coming from channel to input 13 in unit 1 of communication with the channel is compared with the address set in the device. If the addresses are not equal, the channel sampling signal is transmitted on output 15 to other external devices. When comparing, the address and signal "channel sampling are transmitted to communication unit 11 with external devices and further to output 16 to external devices (in particular, data transmission multiplexer), and the device is logically connected to the I / O channel. At the same time, this address is recorded in the control register 2. Received from an external device at input 14, the response address through the block And, block 1, input 15 is returned to the channel. The command transmitted by the channel through the continuing sequence of signals of the initial sampling is received in block 1 and fixed on register 2 in the part intended for storing the command. The command analysis unit 4 checks the command for the presence of a sign of direct connection of external devices. In the absence of such a feature, the command without change is sent to block 11, to exit 16 and further to an external device. The zero status byte received from input 14 on the circuit: block 11, block 1, output 15 is transmitted to the channel. Further interaction may continue with logical disconnection of the device and the resumption of interaction at the request of the subscriber (multiplexed mode) or without logical disconnection (exclusive mode).

In the multiplexed mode, the requirement of an external device and its address are fed to input 14 and to block 11 of communication with external devices and then transmitted without changing to block 1 of communication with the I / O channel and then to the I / O channel. When the external device executes the commands "read," read in the opposite direction, the data is transmitted byte-by-byte from the external device via the same path to the I / O channel. The same chain receives the status bytes of the external device when it executes the commands to “clarify the status and” to check the input-output or after the end of the data exchange. When the external device executes the "write," command, the data is transferred byte-by-byte from the I / O channel to block 1, transmitted by the device to block 11, and then transmitted from output 16 to an external device.

Sending the first byte of data in exclusive mode is no different from that described. However, when sending the next data byte, the block 12 for determining the exclusive mode and issuing the identification signals fixes the presence of the exclusive mode. The following are several (more than two) signals of the channel information, subscriber information indicating that the external device connected to the interface device is operating in exclusive mode. After block 12 issues a sign of exclusive mode, the device begins to operate an algorithm for accelerating the transfer of data bytes through the device. For example, when executing the "write data byte" command received in block 1, is fixed on the first data register 5 and block 12 outputs the received identification signal in block 1 and then the I / O channel. The byte is rewritten to the second data register 6 and transmitted to block 11 and further to the external device, and register 5 is ready to receive the next data byte. This achieves the acceleration of data transfer from the I / O channel to an external device. When transferring data from an external device to a channel (but the command "read"), registers 5 and 6 and block 12 are used in the same way.

The initiation of direct communication between any pairs of external devices (in particular, communication channels of the data transmission multiplexer) is carried out by an input-output channel by transmitting to the device the conjugation of chains of modified commands "control -" count, "control -" count in the opposite direction, "control - write. First, the input / output channel initiates an external device that reads information. To do this, it organizes an initial sample of a reader to transmit the command “control. The address of the external device entering the interface during the initial sampling process is compared in block 1, and in the case of a comparison, is recorded in the device on register 2 in the corresponding bits, transmitted by the device to block 11 and then transmitted from output 16 to the external device. The external device sends its address along the chain: input 14, block 11, block 1, output 15. Next, the channel sends to input 13 and then to block 1 of the interface device a command “control, which is fixed in the device and register 2 in the corresponding bits and then it is analyzed by block 4. If there is a direct connection sign of the external devices stored in the device and the sign of the control command, the interface device forms a zero status byte in block 10 of the state bytes generation and transmits it through block 1 and output 15 to the channel . In response, the channel sends to the device 1 unit mapping bytes (bytes), representing the data of the external device, recorded in the corresponding register bits 2. Next, the device generates 10 status bytes in the unit ("external device terminated," channel terminated) and outputs it via block 1 to the input / output channel. The channel sends a command chain to the device (in

the response to the device state byte), and then arranges the initial sample to bring the read command to the external device. Initial sampling is carried out as described.

In addition, the device resets in block 1 the command chain feature, register bits 2 corresponding to the command, as well as using the free zone search block 3 prepares the free zone address of the local memory block 8 for buffering data taking into account the volume of the array (data counting). Received in the process of initial sampling, the response address of the external device, channel

sends to the block 1 of the interface device a read command that is recorded on register 2 and then analyzed in block 10. If there is a direct connection between external devices and the read command sign, the device sends the read command byte through the AND block and output 16 external device. By price: external device, input 14, AND block, block 1, output 15, the input / output channel receives from the external device status bytes

ready to execute the command. Further interaction during the execution of the "read" command by an external device is carried out between the external device and the device without part of the input - input channel. In the exclusive mode, the external device will transmit to the interface device the entire data array (in the data count) without a logical disconnect from input 14 and output 16. In the multi-duplex mode, the external device on its own initiative interacts with the interface device for the transmission time of one or several bytes. The demand of the external device and its address are transmitted on input 14 to block 11, where it is compared

address of the external device with the address assigned to register 2 from the input / output channel. When comparing addresses, an external device transmits a byte (bytes) of data to the AND block of the device via the same circuit. Then the data

fixed on register 5 and rewritten to register 6. Next, the data from register 6 is undersized to the free zone of block 8 of the local memory, the address of which is prepared by block 3. In block 7 of the address memory, the address is written

Claims (2)

the external device, the address of the local memory zone allocated to this external device, and also the sign of the occupation of this zone. At the next request of the external device and the condition of comparing its address with the address stored in the corresponding bits of registers 2, from block 7, but the address of the external device reads the ALT of the local storage unit 8, where the received data from the external device is written. With the receipt of each byte of data into the device, the value of counter 9 is reduced by one. With a zero value of counter 9, block 10 generates a status byte (with the indicators "external device terminated," terminated channel), which is transmitted to block 1 and then from output 15 to the channel. Further, the input / output channel is initiated by the external device recording the information by transmitting a chain of modified "control-to-write" commands. The initial sample to bring the command "control" to the device, the device to execute the command "command", the initial sample to send the command to "write to the external device" is carried out similarly to the described sequence along the chain of modified commands "control -" read. The difference is that if there is a sign of direct communication of external devices and the command sign "write in block 7, the address of the local memory zone that was filled in by the reading device is entered into the cell of block 7 with the address of the external device, which will execute the command "write. Thus, the address of the zone of the local storage unit 8, in which data of the device is buffered, executing the read command is allocated to an external device writing this data to its storage medium (e.g., transmitting, to the communication channel). After the I / O channel receives during the initial sampling from the external device, a byte of readiness to execute the "write" command, further interaction is performed between the external device and the interface device without the input / output channel. In the multiplexed mode, the demand of the external device and its address are transmitted on input 14 to block 11, where the address of the external device is compared with the address received on register 12 from the I / O channel. The comparison signal is used to read from block 7 at the address of the external device the address of the zone of block 8 in which the data is stored. Data from block 8 is read at this address. The next byte of data is fixed to register 5, rewritten to register O, and block 11 along the chain, output 16 is transmitted to an external device. After each data byte has been transmitted, the value of counter 9 is decremented by one. With a zero value of counter 9, block 10 generates a status byte (with the indicators "external device terminated," channel terminated), which is transmitted to block 1 and then from output 15 to the I / O channel, and in block 7 of the device erases the address of the external device, the zone address of block 8, allotted to this external device, and the sign of the occupation of this zone. The presence of an array of data to be transferred, the formation of bytes in the state byte generation block, the presence of an address memory block, the allocation of a free zone search block, the use of the same zone of a local memory block for the device from which information is being read and the device recording this information on its carrier, the presence of a monopoly mode determination unit and signal issuance identi- fying 5 10 15 20 25 30 35 40 45 50 55 60 65 fikatsii provide information communication between two or more pairs of external devices or communication channels Atrato time of access to the memory of the processor be that allows substantially increase the capacity of the device. The invention device for interfacing external devices with an I / O channel, containing a communication unit with an I / O channel, the first input and output of which are connected respectively to the first input and output of the device, the control register, the input of which is connected to the second output of the communication unit with an input / output channel, a command analysis unit whose input is connected to the first output of the control register, a first data register, the first input of which is connected to the second output of the communication unit with an input / output channel, the second data register, i Which is connected to the output of the first data register, and the output to the second input of the communication unit with the I / O channel, the communication unit with external devices, the first input of which is connected to the second output of the communication unit with the I / O channel, and the first The second outputs of the control register and the output of the second data register, the first output, the second input and the output of the communication unit with external devices are respectively connected with the second input of the communication unit with the input / output channel, with the second input and output of the device, characterized in that with purpose to increase throughput and expand the functionality, the device contains a counter, a state byte generation unit, a local memory block, an address memory block, a free zone search block and a monopoly mode definition block and issue identification signals, the first inputs of the free zone search blocks and the local memory is connected to the output of the address memory unit, the first, second and third inputs of which are connected respectively to the second output of the control register, to the third output of the communication unit to the input channel - The output and the output of the free zone search block, the second input and output of which are connected respectively to the third output of the control register and the first input of the local memory block, the second input and output of which are connected respectively to the output of the second data register and the third input of the first data register, the first the second inputs of the monopolistic mode detection unit and the issuance of identification signals are connected respectively to the first input and the first output of the communication unit with external devices; the first, second and third outputs of the unit are defined The monopolistic mode and the issuance of identification signals are connected respectively to the second input and output of the communication unit with the I / O channel and to the control inputs of the first and second data registers, the third output of the control register is connected to the input of the counter, the output of which and the output of the command analyzer are connected with inputs of a state byte generating unit, the output of which is connected to the second input of the communication unit with an input / output channel. Sources of information taken into account during exertization 1. Avt. St. No. 309357, cl. G 06f 3/04, 1970. 2. US Patent No. 3,573,741, cl. 340-172.5, 1971 (Prototin).