SU1541664A2 - Device for shaping a marker - Google Patents

Abstract

The invention relates to automation and computing and can be used to display information from a computer. The purpose of the invention is to increase the speed of the device. This is achieved by introducing the fourth 19 and fifth 20 triggers, the fifth element And 21, the third 22 and fourth 23 OR elements and the corresponding functional connections. The invention allows for hardware-based clearing of the device’s RAM when the marker is moved. 1 il.

Description

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The invention relates to automation and computing, can be used to display information from a computer and is an improvement of the known device according to the author, St. No. 1444877.

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

The drawing shows a block diagram of the device.

The device contains synchronization unit 1, register 2, first 3 and second 4 counters, first 5 and second 6 multiplexers, first 7 and second 8 blocks of RAM, first element 9, first trigger 10, second element 11, second trigger 12, third 13 and fourth 14 elements AND, third-H trigger 15, first 16 and second 17 eg -: mepts, OR, third multiplexer 15, fourth 19 and fifth fifth 20 triggers, fifth element And 21, third 22 and fourth 23 elements OR, Positions 24 and 25 denote the first h of the second control inputs of the recording device, position 26 - the entry for cleaning the operational second memory device, reference numeral 27 - signal output completion purification RAM memory device, reference numeral 28 - the address inputs of the device, numeral 29 - the output ready signal device, numeral 30 - information input apparatus numeral 31 - the control input of view marker "

The device works as follows.

The device forms a marker in the form of a rectangle or mutually perpendicular lines on the screen of a television indicator in the area of this rectangle. To form a backlight signal, which is input to the modulator of the television indicator, you need to select the raster points that make up the displayed object

For each point of a television raster, three states are possible characterizing a given point: the point belongs to a rectangular figure; i point belongs to mutually perpendicular lines; the point does not belong to any of the displayed objects.

Thus, two bits are needed to encode the three states of each raster point: 01 - for the points that make up the rectangular shape; S - for points constituting

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mutually perpendicular lines; 00 - for points that do not belong to any of the displayed objects.

Information about the raster points in coded form is entered and stored in blocks (X axis) and in 8 (Y axis) memory at addresses corresponding to the position of these points on the CRT screen. In the display, the code read from blocks 7 and 8 goes to the logic of forming the illumination signal of rectangular shapes and mutually perpendicular lines.

Initially, the device is reset. To do this, data 00 is set to data bus 30 and a signal at input 26 triggers 19 to 1. The frame sync signal to synchronization input of trigger 20 rewrites the single state of trigger 19 to trigger 20. As a result, the recording control inputs of blocks 7 and 8, the signals OR 22 and 23, respectively, receive a signal permitting the entry of the zero code at the addresses generated by the counters 3 and 4 operating in the information scanning mode. The signal with the threat O from the second output of the trigger 20 is fed to the input Setting 0 of the trigger 19 and resets it to O, which leads to the appearance of a single signal at the second input of the element 21. The next frame sync signal sets the trigger 20 to O. After that, the output of the element 21 turns on a signal with level 1, which arrives at the output 27 of the signal for clearing the device’s RAM, and means that all the memory cells of blocks 7 and 8 are reset. Thus, the device is in the initial state.

When building mutually perpendicular lines, a code 10 is set on a two-bit data bus 30, and in register 2, by address bus 28, the value corresponding to the coordinate of X points constituting the vertical segment is entered.

The readiness signal on bus 29 (i.e. during the frame traverse), which switches the address inputs of block 7 through multiplexer 5 to the outputs of register 2, and controls the input signal 24 for 51

Writing code 10 to block 7. Writing code 10 to block 8 is similar, with control signals at input 25.

Then, a code 01 is set up on the two-bit data bus 30 for constructing a rectangular figure. By the readiness signal, a code of 01 points constituting two vertical segments is recorded in block 7 at addresses corresponding to the coordinates of these points along the X axis. The code of 01 points constituting two horizontal segments is recorded in block 8 similarly to addresses corresponding to coordinates these points along the y axis.

When displaying information during the movement of the beam along the line, the clock pulses from the first output of synchronization unit 1, corresponding to each displayed point, arrive at the counting input of the counter 3 points in the line. The signals from the outputs of counter 3 through multiplexer 5 arrive at the address outputs of block 7. When switching to a new line synchronously with the operation of the deflecting system, the horizontal sync pulse from the second output of the synchronization block 1 is fed to the input 0 of counter 3 and resets it to the zero state.

Thus, when displaying each new line, the process of reading the code from block 7 is repeated.

The code is read from block 8 of the Y axis in the same way, and the address inputs of block 8 through multiplexer 6 receive signals from the outputs of the 4-line grid in the frame, which are provided with horizontal sync pulses at the counting input, and frame sync pulses from the third output are input block 1 sync.

The illumination signal of the rectangular shape is formed as follows.

The first unit value of the signal from the first output of block 7, corresponding to the beginning of the horizontal segment, is fed to the first input of element 9, the second input of which is connected to the first output of block 8. The first unit value of the signal from the first output of block 8 permits the passage of single signal through the element 9 from the first output of block 7 to the input

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counting trigger 12, which is established with the state of logical 1. The second unit value of the signal from the first output of block 7, meaning the end of the horizontal segment on the same active line, passed through the element And 9, resets the trigger 12 to the logical O. Second

a horizontal segment of a rectangular shape is formed similarly with the second unit value of the signal from the first output of block 8, meaning the top active line.

5 Thus, trigger 12 forms two horizontal segments of a rectangular shape.

Two vertical segments are formed by element And 13. The first unit value of the signal from the first output of block 8 is fed to the input of the counting trigger 10 and sets it to the logical 1 state, and the second unit signal value resets the trigger to logical O. Thus, the trigger 10 determines the region of the active lines of the displayed object in the frame and allows the passage of two unitary signal values on each active line of the region from the first output of block 7 through the element 13, forming two vertical segments of the right angle Noah figure. The result of the logical addition of the signals at the inputs of the OR 16 element is a signal to illuminate a rectangular figure. The formation of the backlight signal of mutually perpendicular lines is carried out by the element OR 17.

0 The state of the logical 1 counting trigger 10, meaning the area of the active lines of the displayed object and arriving at the first input of the And 14 element, permits passing

from one unit value of the signal on each active line in the area of the rectangular figure.

A single value of the signal from the second output of block 8, meaning a string on which the horizontal segment is displayed, allows two unit values of the signal to pass from the first output of block 7. The first single value, which marks the beginning of the horizontal segment, passes through element 11, sets the counting trigger 15 into the logical state 1. The second unit value of the signal from the first output of the block

ka 7, meaning the end of the horizontal segment, resets the counting trigger 15 to logical Q.

The output of the device is the output 1 of the ultraplexer 18. The control input of the Multiplexer 18 is connected to the control bus 31, which determines the type of the displayed marker.

Thus, the invention makes it possible to carry out hardware cleaning of blocks 7 and 8 of the RAM when the marker is moved. This increases the speed of the device.

Claims (1)

Invention Formula Device for the formation of a marker by ed. St. No. 1444877, characterized in that, in order to increase the speed of the device, it contains the fourth and fifth triggers, the third and fourth elements OR, the fifth element AND, whose output is the output of the RAM clear end signal 0 five The first output of the fourth flip-flop is connected to the information input of the fifth flip-flop, the clock input of which is connected to the third output of the synchronization unit, the first inputs of the third and fourth OR elements are respectively the first and second write control inputs of the device, the first output of the fifth flip-flop is connected to the second the inputs of the third and fourth elements OR, the outputs of which are connected respectively to the inputs of the recording control of the first and second blocks of RAM, the second output of the fourth trigger Inonii the first input of the fifth AND gate, whose second input, to the input of Compound Ust.O fourth flip-flop is connected to the second output of the fifth flip-flop, an information input of the fourth trig-. Gera is connected to the input signal Log. 1, the clock input of the fourth flip-flop is the input of the clear memory signal of the device.