SU1464167A1 - Multichannel device for connecting users to common bus - Google Patents

Abstract

The invention relates to the field of computer technology and can be used to organize the access of several information sources (subscribers) to a common backbone. The purpose of the invention is to reduce the number of common trunk lines and expand the field of application by discontinuing the service of the failed subscribers. The device contains two counters, a trigger trigger, a register, three AND elements, two ITS elements, a one-oscillator, and a delay element. 1 il.

Description

one

The invention relates to computing and can be used in decentralized calculating systems to control subscriber access to a common master.

The purpose of the invention is to reduce the number of common trunk lines and expand the field of application by stopping the service of the failed subscribers.

The drawing shows a block diagram of a single channel device.

The device contains k channels, each of which contains counters 1 and 2, register 3, triggers 4 and 5, elements AND 6-8, elements OR 9 and 10, additional triggers 11 and 12, synchronous inputs 13 and 14, and output 15 confirmation device channel request, bus 16 logical unit of the device, common lines 17 and 18, the first - the fourth inputs 19-22 channel, delay element 23 and one-shot 24,

The device works as follows.

The device is intended for arbitration of requests for seizure of a common trunk, which should exclude simultaneous seizure of a common trunk by several subscribers, and can operate in two modes: arbitration mode of requests for seizure of a trunk and blocking mode of arbitration during a common trunk. In the arbitration blocking mode, if the total trunk is captured by the Mth subscription, then the 4 and 5 M-channel triggers are recorded 1. All subscribers requiring the highway's capture enter 1 into the 4 triggers of their channels, giving 1 to input 21 and a signal records to input 22. Trigger 5 is in state 1 of only one channel that captures the highway. The subscriber who captures the trunk delivers the data bits from input 20 through the trunk amplifier to line 18, matching NBB

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driving them with a signal, and yes 19 to line 17, on the leading edge of the signals on line 17, including the leading edge of the tracking signals j on the one-oscillators 24 of all channels, pulses are produced, by which the counters 2 of all channels are set to non-floating,

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I-signal Freeing the line, at the output of the element And 7 is formed 1, by which the trigger 11 is recorded O and the signal from the line 17 is taken. If during the pause the counter 2 reaches the state where the output k-ro is appears 1 and signal 15 appears on line 17

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and Tr 1ggers 12 are zeroed out (confirming the IQ accompaniment, then the output state changes its zero state). In the arbitration blocking mode, resetting (installing) counters 2 occurs on each leading edge of the signals on line 17, to the input of counter 2 The frequency is input from input 14, but the gap between the transmission of words on line 18 is less than the time from setting counter 2 to generating a transfer signal. Thus, during a normal Danz-shgh transmission, the transfer signal of counter 2 is not produced,

In order to release the common highway, the M th subscriber who captures it writes O to trigger 4, giving O to input 21 and a recording signal to input 22. When O writes to trigger 4, to the input of the installation to O of the trigger 5, the installation signal is sent to O. By the difference - the level at the input of trigger 4, the occurrence of E1; when it goes from state 1 to state, 1 is written to trigger 11 (trigger output 4 is connected to trigger input 11, the level 1 is constantly fed to D input) At state 1 of trigger 11, the signal from its output through the element OR. 9 appears on line 17 and is perceived as a signal to release the trunk.

Signal Duration The release of a form-to-main trunk using counter 2 and greater than the duration of the data tracking signals (bits).

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This AND 7 signal is not generated, since prior to the signal from line 17 at the output of delay element 23, the signal from the output of the one-shot 24 counter is reset, and the signal from the output of the k-ro discharge of counter 2 is removed. The delay time on the element 23 is determined by the response time of the single-vibrater 24 and the installation time of the counter 2. The signal from the output of the element And 7 records 1 in the trigger 12, and the installation signal of the counter 1 is removed, its counting mode is unblocked and, consequently, the device transitions in arbitration mode. By the time arbitration begins, counter 1 records codes from the outputs of registers 3, and the codes recorded in counters 1 are different for all channels, which prevents the simultaneous seizure of the trunk by several subscribers.

In the arbitration mode, as a result of writing the corresponding codes to the counters 1, the transfer signals in different channels are formed at different times. If the transfer signal is generated by the 1 M th channel counter and the M th subscriber needs to capture the trunk (1 is recorded in trigger 4), then 1 is recorded in the 5 M channel trigger, and a transfer signal is applied to the C input of the trigger 5 and on the D input

On the leading edge of the Liberate-g signal, level 1 is constantly supplied.

the state of trigger 4, recording 1 into trigger 5, according to the transfer signal, is blocked by the installation level at the input of the installation to 0 trigger 5. Signal

The main line transmitted to the inputs of one-shot 24 all channels at the outputs of one-shot 24 produces a pulse, which is used to set the counters 2 in the initial state and write O into triggers 12. The contents of the counters 2 of all channels increase by 1 as each sync pulse arrives From input 14, the Signal Line Release is held on line 17 until appearance 1 at output k-ro of counter 2, while, as line 17 is

the output of the

This AND 7 signal is not generated, since prior to the signal from line 17 at the output of delay element 23, the signal from the output of the one-shot 24 counter is reset, and the signal from the output of the k-ro discharge of counter 2 is removed. The delay time on the element 23 is determined by the response time of the single-vibrater 24 and the installation time of the counter 2. The signal from the output of the element And 7 records 1 in the trigger 12, and the installation signal of the counter 1 is removed, its counting mode is unblocked and, consequently, the device transitions in arbitration mode. By the time arbitration begins, counter 1 records codes from the outputs of registers 3, and the codes recorded in counters 1 are different for all channels, which prevents the simultaneous seizure of the trunk by several subscribers.

In the arbitration mode, as a result of writing the corresponding codes to the counters 1, the transfer signals in different channels are formed at different times. If the transfer signal is generated by the 1 M th channel counter and the M th subscriber needs to capture the trunk (1 is recorded in trigger 4), then 1 is recorded in the 5 M channel trigger, and a transfer signal is applied to the C input of the trigger 5 and on the D input

g is constantly fed level 1. Prio

the state of trigger 4, recording 1 into trigger 5, according to the transfer signal, is blocked by the installation level at the input of the installation to 0 trigger 5. Signal

The gQ transfer of counter 1 at the state of flip-flop 4 through the element 8 and the element} CHI 9 rises to the line 17. On the leading edge of the pulse on line 17, on the code of the one-shot 24 forgg signal, a signal is triggered, at which The installation inputs of counters 1 of all channels are given installation signals by content

of registers 3, the counting mode of the counters 1 is blocked, and the device from the arbitration mode proceeds with a recurring lock of the arbitration during the data transfer.

The subscriber who captures the trunk (whose trigger 5 is recorded as 1) receives a confirmation signal of capture from the code 15, the trunk is released after the packet is sent by writing O to trigger 4, During the initial installation, O is loaded into triggers 4 in all channels, then one subscriber enters the trigger 4 1, after which the subscriber enters O in the trigger 4, as a result of the procedure described, all channels are reset.

Claims (1)

The proposed device allows organizing the release of the line in case of its false capture due to non-programmable recording 1 to triggers 4 or 5 as a result of a failure. Identification of a false capture of a highway is produced by the absence of data transmission (no tracking signals on line 17) for a predetermined time interval, in which case the output of the transfer of counter 2 generates a signal that triggers 4 channels that captured the trunk (in the trigger 5 which records - Sana 1), O is recorded by the signal from the element ID 6. As a result of writing O to trigger 4, trigger 5 is also entered to O, and the line is released. By the transfer signal of counter 2, 12 all channels are triggered by 1, as a result, the device goes into the mode of arbitration of requests for seizure of a common highway. Invention Formula A multichannel device for connecting the subscribers to a common highway containing k-channels (k is the number of information sources), each of which contains the first and second counters, the first and second triggers, the register, the first AND element, the first OR element, and the first and The second synchronization inputs of each channel of the device are connected to the summing inputs of the first and second counters, respectively; the information input of the first counter is connected to the register output, the z-input and the third sync ten 15 20 25 thirty g 0 The channel path of the device is connected to the informational and synchronous first-trigger, respectively, because, in order to reduce the number of common trunk lines and expand the scope of application by discontinuing the service of the failed subscribers, it additionally contains in each channel. the third and fourth triggers, the single-vibration device, the delay element, the second and third elements AND, the BTopoii element OR, and the direct output of the first trigger is connected to the input of the installation 1 in O of the second trigger and the first input of the first element AND, the output of which is connected to the first input The first OR element, the second one, whose input is connected to the output of the third trigger, the sync input of which is connected to the inverse output of the first trigger, the overflow output of the first counter connected to the second input of the first element I and to the synchronous input of the second trigger, output which is connected to the device channel request confirmation output and to the first input of the second element AND whose output is connected to the installation input O of the first counter, the output and the first input of the second OR element are connected respectively to the recording input of the first counter and the output of the fourth trigger, the synchronous input of which is connected to the input of the third trigger into O and the output of the third element I, the first and second inputs of the cat ergo are connected to the output of the delay element and the output of the M-th digit of the second counter, respectively, the output The overflows of which are connected to the second inputs of the second element AND and the OR element and the installation input to the 1st fourth trigger, the installation input to O which is connected to the installation input to the second counter and the one-shot output, the information inputs from the second to the fourth trigger are connected to the logical unit of the device , the outputs of the first OR elements and the inputs of the Snggs tracking information of all channels of the device are combined according to the INSTALLATION OR scheme and connected to the inputs of one-shot and delay elements of all channels of the device TWA, in-s., the formation inputs of all canstlop are combined according to the HUTAJOK HJBI scheme. 35 40 five