RU1820382C - Device for connecting users to general trunk line - Google Patents

Abstract

The invention relates to computing and communications and can be used in LANs and multi-machine computing systems to control access to a certain shared resource. In order to expand the scope by providing uniform service to subscribers regardless of the intensity of service requests, a delay element 19, a register 9, a comparison circuit 10, a second decoder 11, an OR-NOT 4 element, and a second main amplifier 12 are introduced into the device.

Description

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The invention relates to computer technology and communications and can be used in LANs and multi-machine computing systems to control access to a common resource.

An object of the invention is to provide uniform service to subscribers regardless of the intensity of service requests.

The drawing shows a structural diagram of the device.

The device contains two counters 1 and 7, two decoders 2 and 11. trigger 3, element OR NOT 4. two trunk amplifiers 5 and 12, two elements And 6 and 8, lock code register 9, comparison circuit 10, capture bus 13 and input bus 17 of the device, input 15 request and 18 initial installation and output 16 capture confirmation, delay element 19, information outputs of the first counter 1 are connected to the corresponding inputs of the first decoder 2, the output of which is connected to the clock input of trigger 3, the installation input of which is connected to the output element OR NOT 4, inverse trigger output 3 is connected to the first input of the first main amplifier 5, the input of register register 9 lock code and the output 16 of the device confirm capture, the second input of the first main amplifier 5 is connected to the first input of the second element And 8 and the input 18 of the device is the initial installation, the third input of the first main the amplifier 5 is connected to the overflow output of the first counter 1, the output of the first main amplifier 5 is connected to the capture bus 13, the input of the second main amplifier 12 is connected to the capture bus 13, and its output is with the input of the initial installation of the first counter 1 and the second input of the first element And 6, the first input of which is connected to the output of the second decoder 11 and the second input of the element OR NOT 4. The first input of which is connected to the input 15 of the device request, the output of the first element And 6 is connected to the input of the increment of the second counter 7, the information outputs of which are connected to the first group of inputs of the comparison circuit 10, the second group of inputs of which is connected to the information outputs of the lock code register 9 and the information inputs of the second encoder 11, the output of the comparison circuit 10 is connected to the second input of the second element And 8, the output of which is connected to the inputs of the initial setting of the lock code register 9 and the second counter 7, the counting input of the first counter 1 is connected to the device sync input 14, the information inputs of the lock code register 9 are connected with the input bus 17 of the device, the output of the first element And b is connected to the input of the delay element 19, the output of which

connected to the gate input of the comparison circuit 10.

The device operates as follows. After the power is turned on, an initial setup signal is generated in the system.

0 (N. Inst.). which corresponds to the appearance of a low-level signal at input 18. This signal is fed to the first input of the And 8 element and from its output to the inputs of the initial installation of register 9 of the lock code and counter 7,

5 setting them to the zero state. The same signal N. Ust. enters the second input of the main amplifier bis of its output to the capture bus 13 and then through the main amplifiers 12 of all devices to the inputs of the initial installation of counters 1, setting them to the zero state. In addition, at the first moment of time, there are no request signals at the inputs 15 of all devices, which corresponds to the presence at the inputs 15 to 5 of a high level potential and therefore. at the input of the installation of trigger 3, a low level potential is kept in the zero state.

After the signal is received, N. Set. counters 1

0 under the influence of clock pulses common to all devices coming from the clock inputs of 14 devices will change their state. Thus, at the output of the decoder 2 of each of the available devices, 5 a pulse at a time

prioritized by this

devices, which corresponds to the setting of the de-encoder 2 of each device. Second

the decoder 11 in all devices is set to the zero code in such a way that if there is a zero code at the information outputs of the register 9, the priority code at the output of the decoder 11 is low. Thus, if at the time of occurrence

5 pulses at the output of the decoder 2 trigger 3 is unlocked at the input of the initial installation, which corresponds to the presence of a signal request at the input 15 of the device, i.e. input 15 of this device is low

0 level, then trigger 3 will switch to the single state and low potential from its inverse output through the main amplifiers of all devices will block at the input of the initial installation the counters 1 of all

5 devices. In addition, from the inverted output of trigger 3, the signal is transmitted to the output of the device, confirming capture by informing the subscriber about the capture of the common trunk. After the exchange, the subscriber sets the lock code on the input bus 17 and

removes the request signal by setting a high level signal to the input 15 of the device. Trigger 3 is set to zero. According to the positive difference generated at its inverse output and fed to the input of register 9 of the lock code, the information from the input bus 17 is recorded in register 9 and fed to the first group of inputs of the comparison circuit 10 and to the inputs of the decoder 11, if the code is written in register 9 different from zero, a high level signal is generated at the output of the decoder 11. This signal through the element IL-E E 4 blocks the trigger 3 at the input of the initial installation and is enable for the element And 6.

The second input of the element 1/1 b receives positive differences from the output of the main amplifier 12.

These positive differences are formed at the moments when the line is vacated by neighboring devices. Through the element And these positive differences arrive at the input of the increment of the counter 7 and at the input of the delay element 19. Thus, for each positive difference, the counter 7 will increase its state by G. From the output of the delay element 19, positive pulses arrive at the gate input of the comparison circuit 10. Thus, after each state change of the counter 7, its contents are compared with the code recorded in the lock code register 9. If the compared codes are equal, the output of the comparison circuit 10 displays a low-level signal, which, through the And 8 element, sets the lock code register 9 and counter 7 to zero. From this moment, a low-level signal is generated at the output of the decoder 11, which prohibits the passage of pulses through the element And b and unlocks through the element OR NOT 4 trigger 3 at the input of the initial installation. Thus, the operation of trigger 3 will be determined only by the state of the request signal, i.e. the device may again participate in arbitration. To eliminate the system lock in the absence of requests in all devices, an integral pulse of intermediate correction is generated at the output of the overflow of counters 1.

One of the possible options for constructing this device is the use of microcircuits:

counters 133IE5; decoders 133IDZ; register 133IR1;

trunk amplifiers 133LA8; storage schemes 133SP1;

trigger 133TM2; the delay element is made on 133TM2;

the remaining logical elements are 133. 533 series.

The use of the proposed device allows uniform service to subscribers with different priority levels over a wide range of changes in the frequency of requests of individual subscribers.

Formula of the invention A device for connecting subscribers to a common trunk, comprising meter doses, a decoder, a trigger, two AND elements, a main amplifier, the information outputs of the first counter connected to the corresponding inputs of the first decoder, the output of which is connected to the clock input of the trigger, whose inverse output is connected to the first passage of the first main amplifier. the second input of which is connected to the input of the initial installation of the device, the output of the first main amplifier is connected to the capture bus of the device, the output of the first element And is connected to the input of the increment of the second counter, characterized in that, in order to expand the scope by providing uniform service to subscribers regardless of intensity service requests, it contains delay elements, a register, a comparison circuit, a second decoder, an OR-NOT element, a second main amplifier, and the input of the second the main amplifier is connected to the capture bus of the device, and the output is to the input of the initial installation of the first counter and the first input of the first element And, the information outputs of the second counter are connected to the first group of inputs of the comparison circuit, the second group of inputs of which are connected to the information outputs of the register and the inputs of the second decoder, the group of information inputs of the register is connected to the group of code inputs of the device, the input of registering is connected to the inverse output of the trigger and the output of confirmation of capture of the device The output of the second decoder is connected to the second input of the first AND element and to the first input of the OR-NOT element, the second input of which is connected to the device request input, the output of the OR element is NOT connected to the trigger setup input, the output of the comparison circuit is connected to the first input of the second element And, the second input of which is connected to the input of the initial installation of the device, the output of the second element And is connected to the inputs of the initial installation

register and the second counter, the counting input of which is connected to the gate gate; the first counter is connected to the sync input of the comparison circuit, the overflow output

device, the output of the first element And soy-first counter connected to the third input with the input of the delay element, the output of the first main amplifier.