SU1432542A1 - Device for connecting subscriber to common trunk line - Google Patents

Description

4 00 N9

YU

The invention relates to computing technology and can be used in distributed computing systems containing several sources of information, in particular when creating local area networks.

The purpose of the invention is to improve performance.

: The drawing shows the structural scheme of the device.

I The device contains matching elements 1 and 2, information selector 3, register 4 addresses, 5 1 address counter, shift registers 6 and 7, counters 8-10, triggers 11-14, AND 15-17 elements, OR elements 18–20, delay elements 21–23, comparing element 24 |, AND-OR element 25, magistral 1 26, ashna 27 clock; pulses, input, 28 end of the transmission, input 29 of the transmitted information, output 30 of the resolution - transmission, output 31 of the receive shadow, output 32 of the received information.

The device works as follows.

At the outputs of counters 8-10, forerunner overruns overflow pulses through time intervals PT, T., and T, respectively

3

one

for all the conditions of T.

Right t

: At the output of the information selector 3, a unit is formed when there is information transmitted in: highway 26; in the absence of information, zero At the initial moment, the device 8 is stored in the address of the device from the outputs of the register 4 address. Triggers .11-14 are in the zero state, information is not present on trunk 26.

In this case, the zero signal from the output of the information selector 3 enables the operation of counters 8-10 in incremental mode.

Each of the subscribers connected to trunk 26 in register 4 contains its own address that does not intersect with the addresses of other subscribers. In connection with this, each of them has: its own time interval T ,, seeking the simultaneous occurrence of an overflow pulse at the output of a striker 8 for several subscribers.

The operation of the device on overflow pulses from the outputs of counters 9 and 10 is blocked in the first case

0

0

the left state of the trigger 11 through the element AND 16; in the second case, the zero state of the trigger 14 through the element 17.

The overflow pulse from the output of the counter 8 ensures that the device address from the register address 4 address is entered into the address counter 5 and through the 1-SHI 18 element with a delay f necessary to overwrite the contents of the address counter 5 into the shift register 7 and detected by the delay element 22 toggles the trigger 12 in;} standing units.

The unit state of flip-flop 12 switches the shift register 7 from the parallel information transfer mode to the information shift mode, allowing Q to simultaneously output the device address via the AND-OR element 25 and the matching element 2 to the trunk 26.

At the same time, the overflow pulse from the output of the counter 8 through the element 5 OR 19 is fed to the input of the delay element 23,

With a delay (s s necessary to ensure the output from the output of the register 7 to the highway 26 and the delay element 23 defined, the signal from the output of the delay element 23 through the element SH1. And 20 provides a transition to the zero state. Triggers 11 and 12.

On the start of the selector 3 information

five

0

five

0

the zero is set again, ensuring that the 8-10 counters operate in incremental mode.

The subscriber, who has squeezed his own address into highway 26, switches to the next subscriber's address search mode (by), since the transmissions of the remaining subscribers by T and T are blocked by the zero state of the triggers 11 and 14, the interval T, for this subscriber, short, and also in connection with the switching of the trigger 14 of this device to the state of unity according to the signal from the output of the trigger 12.

A single state of the trigger 14 provides the receipt of clock pulses from the bus 27 clock pulses through the element And the synchronous input of the counter 10.

At a time interval T, j, an overflow pulse from the output of the counter 10 provides an incrementally per unit content of the counter 5 of the address and, through the element OR 18, the delay element 1 with a delay of 1 switches

the trigger 12 is in the unit state and the shift register 7 in the shift mode of the pre-stored address, thereby providing to the trunk 26 through the AND-OR 25 element the matching element 2 of the incremented address.

The trigger 12 is set to the zero state, stopping the transfer of the address, is performed by an overflow signal from the output of the counter 10 through the element OR 19, the delay element 23 and the element OR 20 with a delay - providing the content of the shift register 7 in the master 26.

The search for the address of the next subscriber continues until the address and transmitted address matches the same address as one of the subscribers.

Consider the operation of the device in the mode of identifying the address obtained from highway 26 with its own address.

With a delay of 1, determined by the time required to receive the address from highway 26 through matching element 1 by shift register 6 and comparing the contents of shift register 6 with the contents of address register 4 by comparison element 24, and the delay element 21 realizing, the unit indicating the availability of information in the highway, at the output of the information selector 3, ensures the fixation of the result of comparison of received and own addresses by element 24 in trigger 11.

In case of coincidence of own and received addresses, the content of the trigger 11 is one, that after the current transfer and time interval has expired

ten

20

with trigger

4325424

information transfer through the element H-IiTltl 25 and matching element 2.

The subscriber commutes to the input 29 of the transmission of the shifted information with a delay D, necessary to issue the address of the next subscriber.

In case the subscriber is not ready to transmit (with a delay of D), or after the end of the transmission, the subscriber sends a pulse to input 28 of the end of the transmission, which ensures the initial setting of the trigger 11-14.

Thus, unit state 11 allows the implementation of

25

thirty

35

transfer to this device. The transfer of the right to transfer by subscribers is realized automatically after a time interval T, the same for all subscribers.

The simultaneous presence of a unit in the first trigger 11 of several subscribers is eliminated by the logic of the device.

The operation of the device when receiving information from the highway 26.

When information appears in line 26, the unit from the output of the selector 3 information through the element 15 at the zero state of trigger 12, indicating that this is not its own transmission, arrives at output 31 of the receive permission.

-The presence of a unit at the exit 31 of the permission-reception permits the subscriber to receive information from the highway 26 from the output 32 of receiving information through matching element 1.

40

Claims (1)

Invention Formula A device for interfacing a subscriber with a common trunk, comprising T causes the passage of a pulse two matching elements, the selector 50 the overflow from the output of counter 9 through AND 16 to a single input of trigger 13 and through an element OR 18, delay delay element 22 ensures switching trigger 12 to a single state, thus allowing the address of the next subscriber from register output 7 to highway 26 shift through the element AND-OR 25 and the matching element 2. The signal from the output of the trigger 13, owing to the 55 output resolution 30, permits the subscriber to enter information into the highway 26 through the input 29 of the information, the first counter, the address register, three triggers, two delay elements, the first I element, and the I-SHS element, the information input and the information output of the first and second matching elements are the input and output of the device for connecting to the common highway, the information output of the first matching element is connected to the information input of the information selector, the output of the first el the delay point is connected to the synchronous input of the first trigger, the output of which is connected to the first 0 five information, first counter, address register, three flip-flops, two delay elements, first AND element, I-SHS element, the information input and information output of the first and second matching elements being the input and output of the device for connecting to the common highway, information output of the first matching element is connected to the information input of the information selector, the output of the first delay element is connected to the synchronous input of the first trigger, the output of which is connected to the first the input of the first element is And, the output of the second trigger is connected to the first input of the element AND-OR, the output of which is connected to the information inputs of the second matching element, which is due to the fact that, for the purpose of increasing speed, two shift registers were entered into it, the comparison element, an address counter, two counters, a third delay element, a fourth trigger, two AND elements, three I OR elements, the synchronous input of the first I shift register connected to syi; the first and second counters, the first input of the second element ; that And, with sync This is the second shift register register and is the device input for connecting to the sync output the subscriber, the zero input of the third trig - 20 of which is connected to the input of the third A: Hera is connected to the zero input of the even: true trigger, with the first input of the first element OR, and is the input of the device to be connected to you-: Subscriber transmission end,: the information output of the first closing element is connected with the information: The ALARM INPUT of the first shift register I is the output of the device for; connecting to the subscriber's information input, the output of the third I element is the output of the device for connecting to the subscriber's enable input, the second input of the I-W 18 is the device input for connected to the subscriber's information output, the fourth trigger code is connected to the third input of the element: AND-OR and is the output of the device for connecting to the subscriber transmission enable input, while the output of the first shift register is connected to the first input of the comparison element, the second input of which is connected to Vkodom address register, with the information input of the first counter and the information input of the address counter, the output of which is connected to the information input of the second shift register, the output of which is connected to the fourth input th AND-OR, an output of comparator coupled to the data input of the first flip-flop, a zero input which is connected to the zero input of the second trigger and to the output of the first OR element, the second input of which is connected to the output of the second delay element, the input of which is connected to the output of the second element OR, the first input of which is connected to the overflow INPUT of the first counter, to the input of the record of the address counter and to the first input of the third element ELI, the output five 0 five 0 the delay element, the output of which is connected to the single input of the second trigger, the output of which is connected to the input of the operation mode of the second shift register, to the first input of the third element I, to the single input of the third trigger, whose output is connected to the second input of the second element And whose output is connected to synchronization of the third counter, the overflow output of which is connected to the second input of the second OR element, with the synchronous input of the address counter and with the second input of the third SHSh element, the third input of which is connected to the single input the fourth trigger and with the output of the first element I, the second input of which is connected to the overflow output of the second counter, the permitting input of which is connected to the second input of the third element I, with the enabling inputs of the first and second counters, with the input of the first delay element and information selector.