SU1501072A1 - User to communication channel interface - Google Patents

Abstract

The invention relates to computing and can be used to communicate two computing systems or a computing control device (subscriber) with peripheral devices over a communication channel, for example, a fiber optic communication channel. The purpose of the invention is to increase the capacity of the device. This is achieved in that a device containing a receiver, a transmitter, an amplifier, a key, a modulator, a demodulator, two buffer registers, two counters, two one-oscillators, two delay elements, a pulse generator, two decoders, and two format registers are inputted and output registers, two counters and a decoder. The device allows exchanging parcels (packets) of arbitrary length with peripheral devices without intervals between code words. The format of code words in the parcels can be changed programmatically, both upwards and downwards. The uninterrupted transmission and reception of code words in information packages is provided by organizing the exchange mode between the subscriber and the device against the background of an exchange over a communication channel with a peripheral device. To receive words with a format larger than the counter size, the subscriber, after each word read with the maximum format (determined by the counter size), writes a code defining the format of the remaining part of the word. It is assumed that the change in the information array during reception and transmission is carried out by the subscriber at the program level. 1 il.

Description

about vj yu

The invention relates to computing and can be used to connect two computing systems or a computing control device (CVM) of test equipment with control objects over a communication channel, such as a fiber optic link.

The purpose of the invention is to increase the capacity of the device and the communication channel by providing a mode of wordless transfer of words in information packets without imposing strict requirements on the subscriber on his speed.

The drawing shows a diagram of the device.

The device contains a receiver 1, amplifier 2, demodulator 3, key 4, buffer register 5, output register

3150

6, the first register 7 format, the first counter 8, the decoder 9, the element (line) 10 delay and one-shot 11, the third counter 12, the generator 13 pulses j second counter 14, the decoder 15, the element (line) 16 delay and one-shot 17, register 19 format, information input 19 devices. And (information output of the subscriber) ACCOUNT-rotary counter 20, third decoder 21, input (receiving) register 22, second buffer register 23, modulator 245 transmitter 25, channel input 26 and output 27 of the device, informational output 28, input 29 subscriber readiness5 input 30 sign of record 31 and j output device is ready to accept the word, yield 32 vpsod 33 .sbo subscriber device is ready to transmit.

The device works as follows

In the initial state, the counter I2 is zeroed out and the low level from the output of the first bit of the counter 12 signals to the subscriber at the output 33 that the device does not receive the received information J and the low level at the output of the second bit of the counter 12 keeps the key 4 in the open state and c. In the code 32, the subscriber receives a signal, and there is no failure. The counter 20 is reset, the decoder 2 decodes the zero state of the first and second bits of the counter 20, and a low level from the output of the decoder 21 prohibits the operation of the pulse generator 13. The output 31 sets a low level that signals to the subscriber that the device is ready. word for transmission. Counters 8 and 4, registers 7, 18, 5, b, 22 and 23 are set to zero at the inputs of the device by the subscriber. Low level is set (initial state).

The device is ready to receive and transmit information.

The reception of information is as follows.

The optical signal from the input (optical channel) 26 is fed to the input of the receiver (photodiode) 1. The optical signal converted by photodiode 1 is amplified by amplifier 2 and fed to demodulator 3 ,. which demodulates the converted signal. From the release of the demodulator 3 information in the sequential paraphase to: ode to

four

steps through the public key 4 into the buffer register 5 and simultaneously to the counting input of the counter 8, which counts the bits in the received-dimmed format. When the counter reaches 8, it is equal to the maximum number of bits in the received word format (maximum -

received words in this 32 bit device), the output of the decoder 9 generates a signal that, through delay element 0, enters the input of a single vibrator 1, which generates a single pulse arriving at the resolution input. Parallel recording of the counter 8j to the countable totalizing counter input 1.2 and a parallel register enable input.

as a result, counter 8 registers the content of register 7 (zero), the value of c of the sensor, 12 is increased by one, and from the output 33 of the device the subscriber is given a signal signaling 1Me that the device is ready to transmit the received word to the subscriber B register b rewrites the information received from the communication channel into the buffer register 5. Buffer 1st register 5 is released and ready to receive the next word, Kjffi) 4 4 remains unchecked by skipping the next word from the communication channel, the reception of which by the proposed device can be started before the subscriber reads information from register 6,

The subscriber, having received the device readiness signal from output 33, reads

The kae register 6 is the first word taken from the communication karal and generates a pulse signal at the input 29 about the subscriber's readiness for reception. This signal is fed to the counting subtracting input of counter 12, reducing its content by one, with the result that output 33 is set to a low level, signaling to the subscriber that there is no next word in register 6. In the reception of the second word, the one-shot i again pulls out a pulse and the reception cycle repeats.

During the reading of information by the subscriber from register 6 into buffer register 5. the next word is received.

 „Uiv.-.

From the communication channel and to the end of the reception of the next word, the subscriber should consider the previous one, if the subscriber does not read the previous information during this time.

ten

(does not output pulse pulse to input 29), then at the end of the reception of the next word by the single vibrator 11 a pulse is generated, and similarly to the one described above, the contents of counter 12 are incremented by one, overwrites the information from buffer register 5 to register 6, i.e. previous information is lost. At the output of the second bit of the counter 12, a signal is generated (high level), which prohibits the passage of subsequent information through the key 4, and a subscriber's call signal is set at the code 32.

The last codeword received in register 6 may be used subsequently to determine the location and cause of subscriber failure.

Information is transmitted to the communication channel as follows.

The subscriber records in the register 22 via the information path 19 of the first word and inputs an impulse information recording signal to the input 30, which is injected into the countable summing input of the counter 20, the first bit of the counter 20 goes into a single state and at the output 31 A device readiness signal is set to receive a word from the subscriber. At the output of the decipheror 21 decoding the zero value of the first and second bits of the counter 20, a high level is established allowing the operation of the generator 13, the Subscriber, receiving a signal from the output 31, repeats the loading of the first word into the register 22 and outputting the impulse signal to entrance 30,

five

20

25

thirty

40

Upon the arrival of the second pulse at the input 30, the output of the second discharge of the counter 20 is switched to one state, and the output of the first discharge of the counter 20 to zero. As a result, the device readiness signal for receiving is removed from output 3, but at the output of the decoder 21, the signal does not change, because it decodes the zero value of the first and second bits of the counter 20, and the generator 13 continues to issue shift pulses and the subscriber goes into standby mode output 31 signal readiness from the device.

Clock pulses from the generator 13 are fed to the shift input of the buffer register 23 and the counting input of the counter 14, which counts the number of bi0

five

the tb information transmitted from the buffer register 23,

Upon reaching the counter 14 value equal to the maximum number of bits in a word (the device has a maximum word format of 32 bits), a signal is output from the corresponding output of the decoder 15, to the input of which the signals from the discharge outputs of counter 14 arrive. The signal from the output of the decoder 15, after the delay element 16 has passed, is fed to the input of the one-oscillator 17, which forms a single pulse. The pulse from the output of the single-vibrator 17 is fed to the enable input of the parallel recording of the buffer register 23 and records information from the register 22 into it. The same pulse overwrites the information from the register 18 to the counter 14 and reduces the contents of the counter 20 by one, resulting in The output of the first bit of the counter 20 is set to a high level, and the second bit is set to low, and at the exit 31, the device is ready to receive.

Changing the outputs of counter 20 does not change the state of output of decoder 21, therefore, the generator 13 continues to receive Shift impulses to the buffer register 23 and the counting input of counter 14, the second word is transmitted to the communication channel.

0

five

0

35

The subscriber, having received the signal from output 31, loads the next 40 word into register 22 and issues a pulse signal to input 30,

Next, the transmission cycle is repeated. Since the subscriber records the next word on the background of the transfer of the previous 45, the words go continuously to the communication channel (without pauses between them),

To ensure the correct functioning of the proposed device, the following conditions must be met:

when receiving, the period of pulse research in LIKIN communication must be greater than the sum of the maximum time 5g of parallel recording of information in counters 8 and 12, the decryption time of the decoder 9, the delay of the signal in the delay element 10 and the duration of the one-frequency pulse 11;

when transmitting, the pulse following period from the generator 13 should be greater than the sum of the maximum parallel recording time in counters 14 and 20 and register 23, information decryption time by decoder 15, signal delay in delay element 16, and pulse duration of one-oscillator 17.

The delay element 10 ensures in the device the correct operation of the counter 8 and the necessary time for setting the information at the output of the buffer register 5.

The delay element 16 ensures the correct operation of the counter 14 and the buffer register 23,

For issuing: information from a device with a word format less than the maximum format of the device, the subscriber writes to register 18 on information input 19 a number determined by the relation:

TO

per

K-K

(ABOUT

where k

per

TO

m

TO

require

H re b

the number recorded in the register;

maximum number of bits in the output word format;

required number of bits in the output format. After recording the .c register 18 format, the operations described above are performed to organize the transmission of a codeword to the communication channel. At the end of the first issued word (not formatted), counter 14 is recorded from register 18. A number, the value of which determines the format of the word being transmitted, and which can be determined from the following relation:

 reg

(2)

A device connected to a communication channel does not analyze the first word (it can be issued before power is turned on), and also takes into account (in the program) that the first format word is not informative, since it was issued when the proposed device issued a packet of information . is technologic.

When receiving information from a communication channel with a format smaller than the maximum format that can be received by the device (determined by the counter size 8), the subscriber is

five

0

five

0

five

0

five

0

five

 along information path 19 into register 7, a number, the value of which, depending on the required format of the received device, of the word is determined by the relation ().

After receiving several words from the communication channel (until the counter 8 is filled), the information of which is not analyzed by the subscriber on the pulse of the single-digit 11 register 7 is copied to the counter 8. Further operation of the device for receiving information is performed as described above, and the number of bits in the words taken is determined by the relation (2),

The time allotted to the subscriber to write (read) information to the device (from the device) is determined by the time of information transfer and reception on the communication channel, i.e. format of the word and the frequency of exchange in the communication channel, therefore, for the correct functioning of the proposed device, the cycle time of the subscriber to the device should be less than the product of the number of bits in the information messages of the communication channel (format) by the period of the exchange frequency in the communication channel.

If the subscriber does not have time to read the next word of the packet from the device during the next word reception, the first word is rubbed in register 6 and the subscriber's sign of the subscriber is generated, and when the word is transmitted, a delay in writing the next word causes a pause inside the packet. Upon subsequent recording of information to continue the packet transmission, an extra word is output from the buffer register 23.

The device also allows the issuing and receiving of codewords, the size of which exceeds the size of counters 8 and 14.

This mode of the device is provided by reading - (writing) the code dressing subscriber several times, since the exchange between the subscriber and the device takes place against the background of receiving and transmitting information over the communication channel, and processing received (or preparing The information is produced by the subscriber at the program level.

Dp of issue of code dressing, the width of which exceeds the maximum for the proposed device, ablent (in steady state), having received a signal from the output 31 of the device, loads first into the register 18 a zero code (to ensure the issuance of a word with the maximum format), loads a part of the transmitted word in register 22, it outputs a pulse-write signal to the input 30. On receipt of the next device readiness output 31, the subscriber loads register 18, loads the remaining part of the word into register 22, and outputs 30 a sign of the ocher, full spon, then the transmission cycle repeats.

The format of the words transmitted to the communication channel can be determined by the relation:

% fuck make regM-2

where K is the code value loaded for transmitting the second part of the word to the register 18. The reception of the code code, whose width exceeds the digit of the counter 8, the subscriber (in the steady state) loads the zero iodine into the register 7, then output 33 reloads register 7, reads the previous part of the code word. out of register 6, and outputs a pulse signal to input 29 of the device. After receiving the output of the next ready signal, abyunent loads into the register 7 a zero code, reads. From register 6, a part of the word of maximum formatj reloads register 7, outputs a pulse signal to input 29. Upon the arrival of the next readiness from the call, the 33 subscriber loads into the register 7 a zero code, reads the second part; fishing and md

The format of the received word in this case is determined by the relation:

- warming wake regL-2

where K., 2 is the value of the code loaded to receive the second part of the word in register 7,

The correct operation of the proposed - 55 device is provided under the following condition:

o Q - J5 20

about 25 dos 35 - 40 p 45

50

and

55

where Tf is the format load time in registers. 7, 18;

T is the time of reading (writing) of information from register 6 (to register 22); M is the number of bits received.

(transmitted) the second part of the word (K-Kreg);

kc is the communication frequency period over the communication channel,

Claims (1)

Invention Formula A device for interfacing a subscriber with a communication channel, comprising a receiver, a transmitter, an amplifier, a modulator, a demodulator, a key, two buffer registers, two format registers, two counters, two decoders, two delay lines, two one-shot, a pulse generator, and The information input of the key is connected through a demodulator to the output of an amplifier, the input connected to the output of the receiver, whose input is the input of the device for connection to the output of the communication channel, the output of the key is connected to the input of the first buffer register and the counting input The first counter, whose recording input is connected through the first one-shot to the output of the first delay element, and the output through the first decoder to the input of the first delay, the information input of the first counter is connected to the output of the first format register, the output of the pulse generator to the shift input of the second buffer register the output connected through the modulator to the input of the transmitter, the output of which is the output of the device for underI boiled to the input of the communication channel the first format register is the input of the device for connecting to the subscriber's information output and is connected via the second format register to the information input of the second counter, the counting input of which is connected to the output of the pulse generator, and the recording input through the second one-shot using the output of the second delay element the second decoder to the output of the second counter, which is different from the fact that, in order to increase the capacity of the device, the third and quarter counters and the third decoder are entered into it a torus, output and input registers, the summing input of the third counter is connected to the output of the first one-oscillator and the record input of the output register, whose input is connected to the output of the first buffer register, and the output is the device output for connecting to the subscriber's information input, the information input of the second the buffer register is connected to the output of the input register, the input of which is connected to the input of the device for connection to the information input of the subscriber and the recording input of the second buffer register with the output of the second one-shot and subtractive input of the fourth counter, the outputs of the first and the second bits of which are connected respectively to the first and second inputs of the third decoder, connected by the output to the trigger input of the pulse generator, the control input of the key is connected to the output of the second bit of the third counter, the subtracting input, the outputs of the first and second the third bits of the counter, the summing input and the output of the first bit of the fourth counter are the corresponding inputs and outputs of the device for connecting the ready output the subscriber, the input of readiness for the transfer to the subscriber, the input signal of the subscriber’s failure, the output of the subscriber record feature and the input of readiness for reception of the subscriber