SU1381474A2 - Data input device - Google Patents

Abstract

The invention relates to the field of computer technology and is intended to enter information into digital devices. The purpose of the invention is to increase the reliability of the input information. The device contains a pulse generator 1, a counter 2, a decoder 3, a multiplexer 4, a trigger 5, elements AND 8, 9, 10 and delay elements 6, 7, 12 and allows you to eliminate failures during the input of information. 1 il.

Description

f

   I -I (L

with

00

four

14)

The invention relates to computing and is intended to enter information.

The purpose of the invention is to increase the reliability of the input information.

The drawing shows a structural:) Electrical diagram of the proposed device.

The device contains a pulse generator 1 for controlling the counter 2, the first group of outputs of which is connected to the decoder 3, and the second group of outputs is connected to the address inputs of multiplexer 4, the output state of which is fixed in the RS flip-flop 5, the outputs of which are connected to the first 6 and the second 7 delay and inverse output elements of which are connected to the And 8 element for blocking signals from the pulse generator 1.

The outputs of delay elements 6 and 7 are connected to () () nominal inputs of elements AND 9 and K), respectively, the outputs of which are connected respectively to the S and P inputs m of trigger 5, and the other inputs of elements And 9 and 10 of the same name are connected respectively (-stien11 () to | p mom and inverse outputs My.iijMiii.jOKcufia 4, information inputs of KOTopoi o pddk. to horizontal mats) trials |, 1 11 e; 1 switching elements, vergikal Iukitsym outputs deshfratora 3, the output of the generator 1 pulses through the third delay element 12 is connected to the third input e; | element and 9.

The device works as follows.

In the initial state, clock pulses from the output of the generator 1 pulses through the first element And 8 are fed to the input of counter 2. The signals from the output of counter 2 nociynaKJi to the address inputs of multiplexer 4 and the voltage of the oscillator 3, which wire 1) one sample of the vertical N1LH 111I} | malritz 1 1 switching elements.

When n.pochskiy one of the e.Coments of the com.mutations mit1) 1 1 1 the signal from the output of the de (P1if) at) and 3 enters the corresponding information () input. Multiplexer 4 and appears at the output of multiplexer 4 with the coincidence counter code 2 with the code corresponding to the given switching element of the matrix 11. This signal is fed to the first input of e.1temena i 9 and when pa.ipi inaKjniero impulses the level “1” at the third eiu input sets the trigger 5

0

in the state "O on the inverted output, blocking on the second input of the first element I 8 the passage of pulses to the input of the counter 2, the output of which in this case 5 fixes the code corresponding to the switched on element of the matrix 11.

The second delay element 7 blocks the third element AND 10 for the time of the possible bounce of the matrix switching element 11. When the switching element of the matrix 11 closes, immediately before the arrival of the front of the pulse, according to which counter 2 changes its state, a situation occurs when the output of the multiplexer 4 will form

5 the signal arriving (for fixing in the trigger 5) to the first input of the element AND 9, i.e. to give information about the correspondence of the counter code to the switching element, and the counter goes to the state corresponding to the following interrogated element of the mutation, which is currently not included. To eliminate such a false state at the device output, a delayed impulse of the generator arrives at the third input of element And 9, the magnitude

5, the delay is chosen slightly longer than the time required for setting the first input of the element AND 9 after the arrival of the generator 1 pulse to the input of the counter 2 of the state corresponding to the new controllable switching element of the matrix 11.

When the switching element of matrix 11 is turned off, the signal from the inverse output of multiplexer 4 through the third element AND 10 is fed to the R input of the trigger 5. The trigger 5 is reset to its original state,

5 resolution and the passage of clock pulses through the first element And 8 to the input of the counter 2.

The proposed device, in contrast to the known ones, eliminates failures when entering information from the keyboard, due to the asynchronous closure of the co.muta tion elements with the arrival of the clock signals.

Claims (1)

Invention Formula 5 Device for entering information on the author. St. M 1206768, characterized in that, in order to increase the reliability of the input information, a third delay element is inputted into it, the input of which is connected to the output of the pulse generator, and the output of the third input of the second element I. 0