SU938280A1 - Device for number comparison - Google Patents

Description

(5) DEVICE FOR COMPARING NUMBERS

one ...

The invention relates to automation and computing and can be used to compare numbers with a specified tolerance field.

Devices for comparing two numbers are known, comprising counters with installation inputs, the outputs of the corresponding bits of which are connected to the first and second multiple input circuits AND, output elements AND, triggers and elements OR OR tl.

A disadvantage of this device is its complexity.

The closest to the invention to the technical essence is a device for comparing numbers, containing a comparing unit, the inputs of which are connected to the outputs of a reversible counter and register, a shaper tolerance field whose input 20 is connected to the output Equal comparing unit, and the output through one of the OR elements - to the input of the reversible counter, the control inputs of which through the other OR elements are connected, respectively, with the outputs of the More and Less comparison block 11. J.

A disadvantage of the known device is its complexity, since the comparison of numbers is carried out using a special comparison block and a register.

The purpose of the invention is to simplify the device.

The goal is achieved by the fact that a device for comparing numbers containing a reversible counter, a counter control unit and a tolerance field generator, the first input of which is connected to the output Equal to the device, the second input of a field driver, is admitted to the control input of the device, the first output of the field device’s tolerance connected to the first input of the meter control unit, the first and second outputs of which are connected to

inputs of the subtraction and addition, respectively, of a reversible counter, the information input of the first number of the device is connected to the second input of the control unit of the counter, the third input of which is connected to the input of the sign of the first number of the device, contains the element I, the inputs from the first to the fifth, reversible counter (n is the number of bits of the reversible counter), (+1) and the input of the element I is connected to the first output of the shaper field; the admission inputs of the bits of the reversible counter are connected to information the inputs of the second number, the recording input of the device is connected to the recording input of the reversible counter, the direct and inverse outputs of the nth digit of which are connected to the fourth and fifth inputs of the counter control unit, the sixth input of which is connected to the input of the second number of the device, and tolerance contains a pulse generator, a counter, two flip-flops and an element I, the inputs of which are connected to the inverse outputs of the first and second triggers and the second input of the tolerance field former, and the output connected to the control the input of the pulse generator, the direct output of which is the first output of the shaper tolerance field and the inverse is connected to the subtractive input of the counter, the write input of which is connected to zero inputs of the first and second triggers and the second input of the shaper tolerance field, the clock input of the first trigger is connected to the first input FORMATOR FORMAT tolerance, clock input of the second trigger. Connected to the counter overflow output and second output of the tolerance field generator, which is the output Not equal to the device, output Equal the device is connected to the output of the element AND, the bits of the counter of the generator of the tolerance field are connected to the inputs of the tolerance of the device, the meter control unit contains two AND-OR-NOT elements and a modulo two, the inputs of which are connected by the third and sixth inputs of the meter control unit, the inputs The first group of the first element AND-OR-NOT is connected to the first and fifth inputs of the control unit of the counter, the inputs of the second group of the first element AND-OR-NOT are connected to the second input of the control unit of the counter and inverse during the sum modulo two, the first group of the second element AND-OR-NOT is connected to the first and fourth inputs of the meter control unit, the inputs of the second group of the second element AND-OR-NOT are connected to the second input of the meter control unit and the forward output of the modulo adder two, the outputs of the first and second elements AND-OR-NOT are connected respectively to the first and second outputs of the control unit of the meter.

The drawing shows the block diagram of the device.

The device contains a reversible counter 1, an adder 2 modulo two, elements AND-OR-NOT 3 and l, elements AND 5 and 6, generator 7, counter 8, triggers 9 and 10, information input 11, control input 12, inputs 13 and 1 current bits, outputs 15 and 16 devices.

The device works as follows.

The information inputs of the reversible counter 1 are supplied with the number A in the parallel code. According to the recording signal received at the input of the synchronous counter 1, this

nation

Claims (2)

1. USSR author's certificate number 89103, cl. G About F 7/02, 1972. 2. USSR author's certificate ff 68237, cl. G About F 7/02, 197 (prototype).