SU1196945A1 - Device for displaying information - Google Patents

Abstract

A DEVICE FOR DISPLAYING INFORMATION, containing a display unit, an operational memory unit, the output of which is connected to the first input of the first register and an input of the display unit, a second register, the output of which is connected to the information input of the operational memory unit, the input of the second register is an informational input of the device, the address counter, the marker counter, whose inputs are the synchronization inputs of the device, the second input of the first register is the first control input of the device, the write-read input of the operand block The ram memory is the second control input of the device, characterized in that, in order to increase its reliability, a multiplexer is inserted into it, the output of which is connected to the address input of the RAM unit, the outputs of the address and marker counters are connected to the corresponding information inputs of the multiplexer, the control inputs of which are the third control input of the device.

Description

The invention relates to automation and computing and can be used in alphanumeric displays.

The purpose of the invention is to increase the reliability of the device.

The drawing shows a block diagram of the proposed device.

The device contains information bus-input I, the second register 2, the address counter 3, the marker counter 4, multiplexer 5, memory block 6, the first register, the horn 7, the indication block 8, the clock inputs 9 and 10, the control inputs 11 -13 devices.

The device works as follows.

In the initial state, multiplexer 5 connects the output of address 3 to the address input of block 6 and under the influence of signals from input 1 cyclically polls the addresses of memory block 6, the output of which is generated byte by byte information to be visualized and regenerated, providing flicker-free image display unit.

The regeneration process is accompanied by the installation of the RAM unit 6 on the read mode under the influence of the signal from input 12.

The mode of recording information in the RAM.

The signal from input 11 multiplexer 5 is set to connect the output of the counter 4 of the marker to the input of the RAM block 6, then the information byte is written to the register 2 and, at the command of input 12, the block 6 switches from the read to the record register 2 is rewritten into the cell of block 6, which is addressed by the counter 4 of the marker. The multiplexer returns to the initial state and the action of the signal "Record, block 6 is set to

reading mode information in the display unit 8..

The procedure of writing a byte to the cell of the memory block addressed by the counter .4 of the marker does not disrupt the synchronization of the counter 3 addresses with the image framing cycle by the display unit 8, since switching to the Record mode is not accompanied by an impact on the counter 3 addresses.

0 Assuming that the cycle of writing a byte in block 6 coincides with the cycle of regeneration of the image point (television mode of displaying information), the violation of image stability is reduced to the distortion of one point of familiarity of one image frame associated with the substitution of the current one, the counter state of the 3 address of the counter state 4 markers.

Since the write cycle takes no more than 2 MKS and the time of formation of one frame

Image Q is no more than 20 ms (frame rate 50 Hz); image distortion visible to the human eye is not observed. The mode of transferring information to an external device.

The transfer cycle is carried out similarly to the write cycle, however, block 6 remains in read mode, so the state of register 2 is indifferent, and the signal from input 13 contents addressed by counter 4 of the cell marker 6 is written to the first register 7. Effect of transfer mode

0 for image stability is identical as in recording mode.

The proposed device provides a high raster image stability regardless of the asynchronism of commands from an external device with respect to the current

the image raster state by introducing into the device a multiplexer providing, together with its connections, the implementation of an exchange cycle without disrupting the synchronization of the address counter with the display unit 8.

Claims (1)

A device for displaying information, comprising an indication unit, a RAM unit, the output of which is connected to the first input of the first register and an input of the indication unit, a second register, the output of which is connected to the information input of the RAM unit, the input of the second register is the information input of the device, counter addresses, a marker counter, the inputs of which are the synchronizing inputs of the device, the second input of the first register is the first control input of the device, the write-read input of the operative block of the memory is the second control input of the device, characterized in that, in order to increase its reliability, a multiplexer is inserted into it, the output of which is connected to the address input of the RAM block, the outputs of the address and marker counters are connected to the corresponding information inputs of the multiplexer, the control inputs of which are the third control input of the device. ζ © ς © sl