SU634266A1 - Arrangement for interfacing communication channels with digital computer - Google Patents

Description

the transmitting unit is the ES.XCJloi output group (device, and the output of the coA1ac () unit of the level baths is connected to the third input of the input unit.

In the known device, it is impossible to change the control words of the communication channels, which does not allow organizing a change in the transmission rate but to the communication channel, to connect new terminals. This leads to a narrowing of the functional capabilities of the device.

The purpose of the invention is the expansion of the functions of tbHbix in () capabilities by providing exchange with various transmission rates by communication channels.

The goal is achieved in that the device contains a control word modification block and a message end analysis block, the input and output of the message end analysis block are connected respectively to the output of the time interval to code block and the fifth input of the control block, the output of which and the output of the communication unit with the digital computer through the control word modification unit is connected to the third input of the communication unit with the digital computer and to the fourth input of the control word storage unit.

The block diagram of the device shown in the drawing.

The device for interfacing the communication channels with the CW.M comprises: a transmitting / receiving unit 1, a block 2 for level matching, a block 3 for input, a time sensor 4, a block 5 for converting a time interval into a code, a block for analyzing the end of a message, block 7 output, b.yu 8 storage of control words, block 9 of modification of control words, block 10 ut1rav: enn, block 11 of data storage, block 12 of communication with a digital computer, block 13 for shaping the address.

The device works as follows.

The information transmitted over the communication channels enters block 1, which is a set of various modems that perform the reception and transmission of information at different speeds. In this block, the information is converted into 1p.m. signals of the ROLE form. These signals come in b.yu 2, where they are converted to standard levels of the microelectronic base on which the device can be executed, and from the output of block 2 the inputs of the input unit 3 are received. The input unit 3 determines the moments of state change, channels and records information in block 8 with a real-time mark assigned to the input of input block 3 / time sensor 4. To record such information in block 8, a fixed area is allocated that fills the trace at K) u and m go m:

the information is recorded sequentially from the initial to the final address and 110 exhausting the volume of block 8 is again recorded from the initial address, because

to this time the beginning. Block 8 addresses have already been released. The current address of the block 8. by which information from the input block 3 is written is checked for compliance with the current reading address by block 5. When writing the next piece of information in block 8, the read and write addresses are different, and block 5 reads the information encoded in time variable labels, and converts information into binary code and its control. For this purpose, in block 8, control words are stored at. I, in which the characteristics of the communication channels are recorded: the time ripeni of the main change over the given channel, end; 5 roll cm of the block, control type for the channels (matrix or cyclic), the number of the terminal transmitting, the current state of block 5, the transmission rate of this channel, the parameters of synchronization occurrence.

0 Conversion of time stamps into double-bit codes is carried out as follows: in block 5 from each time a change of state in channel t; subtracts the time of the previous state change,

5 in such a way. B1) 1 is the length of the i-th stack, D t, ti.- t, -, and the number of bits enclosed in the i-th package is

U - ii

where D t is the rate constant (duration

0 one bit) of this channel, specified in the control of the receive word.

If nil. is fractional, then on the titi-tc section, the duration of single and zero parcels and block 5 for all A t are calculated; attributed the prevailing value. Block 5 performs the accumulation of information symbols and their control, and realizes the writing of the specified information into the receive control words. When the accumulator .ten informational byte, block 5 on its

the outputs generates a signal issued to the control unit 10, which accesses the address generation unit 13, which generates the address by which information is recorded to the unit 11 via this channel. Thus, in block 1, information blocks (data blocks) are assembled.

The full JVICHT transmitted from the terminal ends with the transmission of the special character " end of transmission. Each onQ information byte collected in block 5 is analyzed by an analysis message analyzer block of the end of message 6. In case of detection of the "end of transmission" symbol, this block generates a signal at its outputs to the control unit 10, which sends a signal to block 12, which processes the information read by the CVM from block 11.

The DVR can output information to the terminals either by their requests or by solving the tasks on a schedule, with the information, the output of m on terms. Provides / addresses to terminals. Information through block 12 and block 11 with the help of control block 10 and block of forming address 13 is written into block 11. Simultaneously with this block 12 through block of modifying control words 9 writes addresses of terminals into output control words (similar to the input mode, each channel corresponds to its own control CvTOBo output), stored in block 8, and in special registers of output block 7. The number of bits of these registers corresponds to the number of communication channels with terminal consoles, the number of registers corresponds to the number of speeds cottages by channels.

The output control words contain the following information characterizing the communication channel upon issue: the checksum of the output unit, the number of the terminal to which the output is made over this channel, the current status of the output unit, the field for storing terminal requests for output resolution.

Each special register of output unit 7 is processed by a clock generator included in the control unit 10, with frequencies corresponding to the transmission speed of all channels whose addresses are placed in this register. Output unit 7 determines the smallest address of the channel for which issuance documents are prepared. At the channel address, output unit 7 reads from control unit 8 a control word for outputting this channel. Depending on the state of the bits characterizing the current state of the block, the output block 7 generates at its outputs a signal arriving at the control unit 10, which through the address forming unit 13 reads the information byte from the block 11 and writes it to output block 7. Output block 7 sets the outputs of the code of the next bit inserted into the channel that goes to the inputs of block 2, which converts the signals to the levels of modems, and block 1, which modulates the bits in a standard way and sends them to kana l connection The remaining byte data bits are again recorded in the output control word, which is recorded in block 8 until the next clock signal of the generator arrives. After reporting the reception results of the transmitted data block received from the terminal, the next data block is transmitted, or repeated delivery of the previous data block is organized. If the output of the entire document to this terminal is over and the information in block 11 is no longer present, then output block 7 modifies the corresponding bits of the output control word in such a way that this terminal is no longer served by output block 7.

In the course of operation, a new terminal may be connected to the communication channel, or the transmission rate over the channel may be changed. In that

case. m., and records the corresponding messages that go to block 12, which forms a signal at its outputs to control unit 10. Control unit 10 generates a signal, by which information from block 12 is copied to the control words modification block 9, implementing write to block 8 at the address for this channel of new input and output control words.

Thus, the introduction of bikes 6, 9 and new connections allowed the exchange of digital computers with communication channels having different transmission rates, i.e. to achieve the extension of the functionality of the known device.

In addition, input / output to a digital computer using a multichannel stream of information coming in the form of complete documents over 128 channels of communication in a wide frequency range (50-9600 baud) significantly saves the time spent on composing the finished dock. copies from separate data blocks, reduces the number of interruptions of a digital computer.

All this makes it possible to reduce the performance requirements of digital computers, i.e., it allows the use of digital computers EU-1020, EU-1030 for the specified number of channels and speed range.

The use of EC-840, EC-8402 devices similar to the invention, produced by domestic industry, would require the use of more high-speed digital computers of type EC-1033, EC-1040, EC-I) 50. The expected cost of the invention will be equal to the cost of the EC-8402 device.

Claims (2)

1. USSR author's certificate number 516031, cl. G 06 F 3/00. 1973. 2. US patent number 3362015, cl. 340-172 5, 1972.