SU1312560A1 - Device for providing information output on srceen of cathode-ray tube - Google Patents

Abstract

The invention relates to computing and can be used in devices for outputting alphanumeric and graphical information to a screen of a cathode ray tube (CRT). The purpose of the invention is to expand the field of application of a device by increasing the rate of exchange with a micro-computer over time.

Description

the account of ensuring the constant readiness of the device for the exchange, which is achieved by introducing into the device of the buffer register 2I, the synchronization unit 22 and the driver 25 control signals with the corresponding

one

The invention relates to computing technology and can be used in devices for outputting alphanumeric and graphic information to a screen of a cathode ray tube (CRT).

The purpose of the invention is to expand the field of application of the device by increasing the exchange rate with the microcomputer by ensuring that the device is always ready for exchange.

Fig, 1 shows a block diagram of the device; .on FIG. 2 shows functional diagrams of a synchronization unit and a control signal generator.

The device contains a clock pulse generator 1, specifying the necessary time sequences, the output 2 of the generator 1 generates an information shift control signal, a 3-point counter that generates 4 clock pulses at the output with a follow-up period equal to the formation time of one familiarity line, and at the output 5 a signal defining the number of points in one line of familiarity, counter 6 familiarity, generating at output 7 address signals that determine the horizontal coordinate of the current familiarity, at output 8 - synchronization a clock signal with a period equal to the duration of one line familiarity, a counter 10 lines familiarity forming the output 11 of the address signals defining the current line of the familiarity, output 12 the clock pulses the following period is equal to the duration of one line of information; the counter 13 is informational lines, which produces at output 14 address signal lines that define the vertical coordinate of the current sign-function links that allow It is necessary to assign the read / read cycle of the microcomputer to the read cycle of information for display when the microcomputer is accessed to the regeneration memory block 19, 2 Il.

O

five

places, output 15 is a synchronizing signal needed to form a frame sync pulses, a shaper 16 frame sync pulses, shift register 17, a character generator 18, a regeneration RAM block 19, an address switch 20, a horizontal sync pulse shaper 21, a sync block 22 forming output 23 is a signal that synchronizes the microcomputer's operation with the operation of the device itself, a buffer register 24, the information inputs of which are connected to the output of block 19, a driver 25 of control signals forming the output e 26 is the write signal to block 19, output 27 is the control signal of address switch 20, output 28 is a synchronization signal, output 29 is an information suppressor, the matching unit 30 provides for the device to exchange information with the micro-computer and generates the following signals : at output 31 -, the signal of reversal (selection) of block 19 (formed at any reversal of micro. ro-computer in block 19), at output 32 - a signal of writing to block 19 from a microcomputer, at output 33 - a signal, recording addresses, outputs 34 (data bus) are data intended for recording addresses or data.

The device also contains the address register 35, a video signaling device shaper 36, a CRT 37 and a microcomputer channel 38 (not shown).

The synchronization unit 22 contains a trigger 39 and a one-shot 40. At the output 23 of the unit 22, a short signal is generated during any microcomputer access to block 19 on the leading edge of the signal from the output 4 of the 3-point counter (only one signal is generated during the access time). For-

5 Worlds 25 control signals

0

five

0

contains delay element 41 with inversion 42, inverter 42, shift register 43, element 44, trigger 45, driver 46. The delay element must provide a delay sufficient for parallel input of information into shift register 43 at a signal from output 23 of synchronization unit 22. The timing of the recording signal in the regeneration unit 19 is determined by the clock signal from the output of the imaging unit 46 and depends on the type of memory chips selected.

The device works as follows.

Characters are generated by highlighting the corresponding combination of dots in the dot matrix, which each character contains on the screen.

13

CRT. A set of images of characters. Stores-2d formations for transmission to the micros channel in the permanent memory of the character generator 18. The information for display is stored in an encoded form by a 19-bit regeneration memory block, previously filled by the micro-EVM. output 34 (Electronics is used as a micro-computer).

At the addresses specified by the familiarity counter 6 and the 13 information lines counter, the character codes synchronously with the beam moving across the CRT screen are read from block 19 and fed to the input of the character generator 18 along with signals from the trigger 11 of the familiarity line 10 that carry information about the current familiarity line. The character generator converts the information arriving at its input into a line-by-point dot decomposition of character images. The converted information is displayed in the shift register 17, the output of which is a sequence. but enters the shaper 36 vievm.

at the moment of receipt of the next signal from the output 4 of the counter of 3 points on the code of block 19, information is found that is read at the specified address. The control signal generator 25 removes from the output 27 the control signal of the address switch 20 and generates a read signal at output 28

30 of information in register 24, at output 29 — the image blanking signal on the CRT screen (during the cycle of accessing block 19 from the micro-computer, information not corresponding to the position of the beam on the CRT screen was recorded in the shift register 17). The signal from the output 28 of the driver 25 of the control signals is also used by the matching unit 30 to transmit the response signal to the microcomputer channel. Thus, a message is issued indicating that the data read from the regeneration memory block 19 is in the channel.

35

40

According to the next signal from the output 4 of the counter 3 points, the information about the current familiarity line is entered correctly into the shift register 17, and the driver 25 of the control signals they

45

deosignal.

The microcomputer is addressed to the display device via matching unit 30.

If it is necessary to access block 19, the micro-computer preliminarily records Q from output 29 and displays the blanking signal in address register 35 in the address 35 address of women on the CRT screen.

on which the appeal will be made. Thereafter, for reading information from block 19, the micro-computer reads (when writing information — a record) from block 19 of the display device.

At the same time, at output 31, the matching unit 30

125604

borki block 19 arriving at the block

22 syncs. On the first signal from the output 4 of the counter 3 points in the shift register 17 is entered - information about the current line of familiarity and high-frequency. At the output 23 of the synchronization unit 22, the signal synchronizing the micro-computer in block 19 with the information reading cycle from the block 19

fO to display on a CRT screen. The control signal generator 25 generates at output 27 a control signal of the address switch 20. The switch 20 addresses disconnects from the address

f5 of block 19 is the address specified by the counter 6 familiarity and the counter 13 information lines, and connects to them the address from the outputs of the register 33 addresses. A cycle of reading information for transmission to the microcomputer channel begins.

at the moment of receipt of the next signal from the output 4 of the counter 3 points on the code of block 19, information is read at the specified address. The control signal generator 25 removes from the output 27 the control signal of the address switch 20 and generates a read signal at output 28

information in register 24, output 29 - image blanking signal on a CRT screen (during the cycle of accessing block 19 from a micro-computer, information not corresponding to the position of the beam on the CRT screen was recorded in the shift register 17). The signal from the output 28 of the driver 25 of the control signals is also used by the matching unit 30 to transmit the response signal to the microcomputer channel. Thus, a message is issued indicating that the data read from the regeneration memory block 19 is in the channel.

According to the next signal from the output 4 of the counter 3 points, the information about the current familiarity line is entered correctly into the shift register 17, and the driver 25 of the control signals they

The output signal from the output 29 is the signal for blanking images on the CRT screen.

During the write cycle, information to the inputs of block 19 is output from output 34, and the control signal generator 25 produces, at output 26, an information recording signal into block 19.

Thus, when the microcomputer is addressed to block 19, the microcomputer write (read) cycle is tied to the read cycle of information for display.

F. formula

A device for displaying information on a cathode-ray tube (CRT) screen containing a clock pulse generator, whose code is connected to the shift register shift input and point counter inputs, the first code of which is connected to the familiarity counter input, and the second output to the control input of the register shift, the output of which is connected to the video input of the video signal shaper, whose frame and line inputs are. connected to the outputs of the frame and line sync pullers, the inputs of which are connected respectively to the first output of the counter, information lines and the first output of the familiarity counter, the second section of which is connected to the first information input of the address switch, the second information input of which is connected to the second the output of the counter information lines, the input of which is connected to the first output of the row counter familiarity, the second output of which is connected to the address input of the character generator, and input - to the third output of the familiarity counter, the output of the character generator is connected to the information input of the shift register, the input control control of the character generator is connected to the output of the regeneration memory block, the address input of which is connected to the output of the switch, the third information

 .

the input of which is connected to the output of the address register, the output of the video signal generator is connected to a CRT modulator, and a matching unit, which is played by the fact that

: expanding the field of application of the device by increasing the exchange rate with the microcomputer by ensuring that the device is constantly ready for exchange, it contains a buffer register, the information input of which is connected to the output of the regeneration memory block, the output - with the information input of the matching unit, the block sync syncronization and control signal generator, the first output of which is connected to the control input of the regeneration memory block, the second output to the control input of the switch. addresses, third exit - to

the synchronization inputs of the matching unit and the buffer register, the fourth output to the input of the driver of the video signal,. first exit of the block

25 vani is connected to the inputs of the synchronization unit and the control signal generator, the second output is connected to the recording input of the control signal generator, the third code is connected to the information input of the address register, and a quarter is connected to the recording inputs of the address register and the operational memory block, the output of the block synchronization is connected to the synchronous input

 a control signal generator, the first and second control inputs of which are connected respectively to the output of the clock generator and the second output of the point counter,

40 connected to the control input of the sync block.

Ф11Ь.2

Claims (1)

The claims of $ A device for outputting information to the screen of a cathode ray tube (CRT) containing a clock pulse generator, the output of which is connected jq to the input of the shift register of the shift and the inputs of the point counter, the first output of which is connected to the input of the counter is familiar, and the second output is to the control input of the register shift, the output of which is connected to the video input of the video signal conditioner, frame and line scan inputs of which. They are connected respectively to the outputs of the frame-shaper and line 20 clock pulses, the inputs of which are connected respectively to the first counter output, information lines and the first counter output, the second output of which is connected to the first information input of the address switch, the second information input of which connected to the second output of the information line counter, the input of which is connected to the first 30 output of the line counter familiarity, the second output of which is connected to the address input of the character generator, and the input to the third output of the counter is familiar, the output of the character generator is connected to the information input of the shift register, the input for controlling the reading of the character generator is connected to the output of the regeneration RAM block, the address input of which is connected to the output of the address switch, the third information> 0 ~ 6 input of which is connected to the output of the register addresses, the output of the video signal conditioner is connected to the CRT modulator, and a matching unit, characterized in that, in order to expand the scope of the device by increasing the exchange rate with micro-computers due to the constant readiness of the device for exchange, it contains a buffer register, the information input of which is connected to the output of the regeneration random access memory block, the output is connected to the information input of the matching unit, the synchronization unit and the control signal generator, the first output of which is connected to the control input regeneration RAM block, the second output is to the control input of the address switch, the third output is to the sync inputs of the matching unit and the buffer register, the fourth output is to the input video driver,. the first output of the matching unit is connected to the reversal inputs of the synchronization unit and the driver of control signals, the second output is with the recording input of the driver of the control signals, the third output is with the information input of the address register, and the fourth call is with the inputs of the address register and the regeneration RAM block , the output of the synchronization unit is connected to the sync input of the control signal generator, the first and second control inputs of which are connected respectively to the output of the clock generator and the second the course of the point counter connected to the control input ¹ of the synchronization unit.