KR0133457B1 - Cd-graphics decoder's color-look-up table control device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color-lookup table control apparatus for a CD graphics decoder. In the related art, a configuration for exporting a video output by inputting a subcode of a CD and writing or reading using font data according to a command is very complicated. There was an unfavorable problem during the conversion. Therefore, the present invention makes it possible to configure all of the digital logic to read and decode the image data from the CD (CD) to facilitate the ASIC (ASIC).

Description

Color-Lookup Table Control of CD Graphics Decoder

1 is a structural diagram of a color-lookup table (CLUT).

2 is a block diagram of a color-lookup table control apparatus of the present invention CD graphics decoder.

3 is a detailed circuit diagram of the write address control unit in FIG.

4 is a detailed circuit diagram of an address controller in FIG.

5 is a detailed circuit diagram of a data processor of FIG.

* Description of the symbols for the main parts of the drawings *

3: light control unit 4: color-lookup table

5 address control unit 6 data processing unit

8: write address ROM 10: write address counter

11: J-K flip flop 12: dip flip flop

13 signal generator 15 combination unit

17,18: multiplexer 19,20: tri-state buffer

21, 22: offset section 23: mixer section

24: 1 plan state part 25: 4 x 1 multiplexer

The present invention provides an apparatus for controlling a RAM for storing values of R, G, and B in a color look-up table (CLUT: CLUT) when recording and reproducing image information on a recording medium of a digital audio disc. Especially, when the CLUT load command is input among the image processing commands, the color-lookup table of the CD graphics decoder stores the value specified in the CLUT and outputs the color of the picture displayed on the screen according to the value of the external picture memory. It relates to a control device.

Conventionally, since the configuration for exporting a video output by writing or reading using font data according to a command by inputting a sub-code of a compact disc (CD, hereinafter referred to as a CD), there is a disadvantage in converting ASIC.

Accordingly, an object of the present invention is to provide a color lookup table providing apparatus of a CD graphics decoder for controlling a color look up table according to an image control command.

Another object of the present invention is to provide a color-lookup table control apparatus of a CD graphics decoder, which makes it possible to digitalize all of the decoding and reading of image data from a CD (CD). It is for.

It is still another object of the present invention to provide a color graphics table decoder of a digital graphics decoder which digitally implements a control field for controlling the color lookup table (CLUT) in the CD graphics decoder.

In order to achieve the above object, the color-lookup table controller of the present invention may be configured according to the state of memory control (MEM-CNT) when a command to load (LD-CLUT) is input as shown in FIG. Specifying an address according to the instruction to load in the blanking period of the horizontal synchronization HSYNC, and outputting the write enable signal WE and the output enable signal OE to the color-lookup table 4 so that the color data is R, G. The output control signal OE outputs the write control unit 3 to store in the form of B, the write address WR-ADDR of the write control unit 3 and the memory data MEM-DATA input from an external memory. And the data read from the color-lookup table 4 according to the state of the memory control (MEM-CNT) and R, G, B, and the like. The color-lookup on CDG-D and CDEG-D input It constitutes a table (4) the data processing unit 6, which write the data to.

In addition, the write control unit 3 includes a write address ROM 8 for determining an initial address to be written to the color-lookup table CLUT when a load command is applied as shown in FIG. The light clock selection unit 9 for determining whether to write color data to the CDG-CLUT or CDEG-CLUT according to the memory control (MEM-CNT) state, and the light clock when the load command (LD-CLUT) is applied. An ora gate 7 for enabling the selector 9, a write address counter 10 for increasing the write address WR-ADDR as the data output from the write address ROM 8 is counted; A JK flip-flop 11 for outputting the signal END of the output of the oragate 7 and the fed back end output, and an output of the JK flip-flop 11 are inputted to the data input terminal, and a clock terminal ( Horizontal sync (HSYNC) applied with CLK) A deflip-flop 12 for outputting data synchronized with the controller; a note gate 16 for inverting the output of the de-flip-flop 12 into an output enable signal OE; A signal generator 13 for outputting a write enable signal WE, an address enable signal AD-EN and an end signal END as enabled by the output of the flop 12, and the light clock selection And a combination unit 15 for outputting a CDEG-WE signal and a CDG-WE signal produced by combining the signal output from the unit 9 and the signal output from the signal generator 13.

Referring to the operation and effects of the present invention configured as described above in detail.

First, the data stored in the CD (CD), when the image information stored in the CD (CD) as a sub code, the format of the stored sub code is 8 bits, P, Q, R, S, T, U It is recorded as 8 channels of V and W. Among the 8 channels recorded, P and Q are used in the audio portion of the CD and the remaining 6 channels of R, S, T, U, V, and W are recorded. Record the image. Here, R to W form one symbol with six bits, and 98 symbols are one block. Of the 98 symbols, 2 symbols are used as data signals, and the remaining 96 symbols are divided into 4 parts so that 24 symbols are the minimum unit of data. In the above, 24 symbols are used as one pack to constitute the minimum unit of the image processing instruction.

In the configuration of 1 pack, the first symbol is a mode (MODE) and an item (ITEM), and the second symbol is a command. The third and fourth symbols are error correction symbols Q0 and Q1, and the fifth to twentieth symbols are data symbols. The 21st to 24th symbols are the error correction symbols P0 to P3. Lower the mode in the first symbol, and the second symbol is an image processing symbol that determines how to use data symbols.

The CD graphics decoder device reads and decodes the image information stored in the CD. The CD graphics decoder device inputs a subcode from a digital signal processor (DSP), corrects an error, and processes an image processing command.

Referring to FIG. 2, the control of the color-lookup table of the CD graphics decoder which is processed by the above command is described. First, when the subcode of the CD is input, the image processing instruction symbol is decoded to decode the color-lookup table ( If the command to load data into the CLUT 4 is carried out, the command LD-CLUT has a certain value. Here, two commands for loading data into the color-lookup table 4 are provided in the TV graphics mode and 48 commands in the extended graphics mode. When each command is input, an address is assigned according to the respective command. Color data is stored in the color-lookup table.

When the load instruction (LD-CLUT) is enabled in this manner, data is written to the color lookup table 4 during the blank period of the horizontal synchronization HSHSC according to the state of the memory control MEM-CNT. The time to start writing is when the HSYNC starts.

If you look at the structure of the color-lookup table 4 for a moment, as shown in Fig. 1, the output 4 bits of the primary memory and the 4 bits of the secondary memory are combined in the extended TV mode, so that 8 bits of the CDEG-CLUT (1) are combined. It becomes an address, and it is possible to select 256 colors. In the TV Grase mode, 16 colors are designated in the CDEG-CLUT (1) using only the output of the primary memory. The CDG-CLUT 2 is used when the extended tub is in two-plane state in graphics mode. In the two-plane state, the cut and dissolve effects can be achieved.

The cut effect is to alternately output the data of the primary memory and the data of the second memory, and the dissolve effect is based on the R, G, B data and the secondary memory data of the CDEG-CKUT (1) designated by the primary data. R, G, and B data of the designated CDG-CLUT 2 are outputted by adding R data, G and G, and B to B data.

The light control unit 3 outputs the light enable signal WE and the output enable signal OE to the color-lookup table 4 in the blank period of the horizontal synchronization HSYNC to enable the load state. According to the command LD-CLUT, the write address signal WR-ADDR for sequentially increasing the address of the color-lookup table 4 is outputted to the address controller 5. Since there are 8 color-lookup table (CLUT) addresses in one pack, when the load command (LD-CLUT) is input, the initial address is determined and the address is incremented by 1 sequentially so that the increment is 8 from the initial address. Continue until

The address controller 5 receiving the write address signal WR-ADDR from the write controller 3 outputs the memory data MEM-DATA input from an external memory to the output enable signal of the write controller 3. Selected by (OE) to output to the address of the color-lookup table (4). That is, normally, when the output of the memory data MEM-DATA is output to the color-lookup table 4 and the load command LD-CLUT is input, when the output enable signal OE is enabled, the write control unit 3 Output WR-ADDR is input to the color-lookup table 4.

At this time, the data processor 6 outputs the color data read from the color-lookup table 4 to R, G, and B according to the state of the memory control (MEM-CNT), and the color-lookup table 4 writes. In this case, it receives the CDEG-D or CDG-D input from the outside and outputs the data (CLUT-DATA) of the color lookup table (4).

Next, a detailed operation of the light control unit 3 will be described based on FIG. 3. When the command LD-CLUT to load the color-lookup table 4 is enabled, the color in the write address ROM 8 will be displayed. The initial address to be written to the lookup table 4 is determined and output to the write address counter 10. At this time, the oragate 7 is set to 1 to enable the write clock selector 9. Then, the write clock selector 9 writes the color data to the CDEG-CLUT 1 of the color look-up table 4 according to the memory control signal MEM-CNT applied from the outside. If the input memory control signal (MEM-CNT) is one plane state, enable CDEG to write to CDEG_CLUT (1), and if it is two-plane state and primary working, Enable.

The JK flip-flop 11 is set to 1 by the oragate 7 when the load command LD-CLUT is enabled, and the flip-flop 12 is set when the horizontal synchronization HSYNC is enabled. Enable the signal generator 13. While the signal generator 13 is set by the flip-flop 12, the write enable signal WE is connected to the CDEG) WE signal generated through the AND gates AD1 and AD2 of the combination unit 15; The CDG-WE signal is output to the color-lookup table 4, and the write enable signal AD-EN is output to the write address counter 10 to increase the write address. The eight CLUT data are loaded into the color-lookup table 4, and then the end signal END is output to the K input terminal of the J-K flip-flop 11.

The output of the flip-flop 12 outputs an output enable signal OE made through the note gate 16. The CDEG output of the write clock selector 9 and the write enable signal WE of the signal generator 13 are transmitted to the CDEG-WE through the AND gate AD1 and the CDG of the write clock selector 9. The output and the write enable signal WE of the signal generator 13 are output to the CDG-WE through the AND gate AD2.

As shown in FIG. 4, the address control unit 5 outputs the output of the light control unit 3 to the multiplexer 17 and 18 according to the output enable signal OE output from the light control unit 3. WR-ADDR and memory data (MEM-DATA) are selected and output. For example, when the output enable signal OE is enabled, the write address WR-ADDR is output to the CDEG-AD, and the output enable signal is output. When (OE) is disabled, memory data MEM-DATA is output to the color-lookup table 4.

In addition, the data processing unit 6 buffers the CDEG-A and the CDG-D in accordance with the output enable signal OE output from the write control unit 3 as shown in FIG. A three-state buffer 19 and 20 outputted through the < RTI ID = 0.0 >) < / RTI > the output data CLUT-DATA of the color-lookup table 4, added to the mixer section 23 for outputting the added data, and the color. One-plane state unit 24 for transmitting the data received from the output data CLUT-DATA of the look-up table 4, the offset unit 21, 22, the mixer unit 23, and the one-plane state. One of the data input to the input terminals A, B, C, and D through the unit 24 is configured by the 4x1 multiplexer 25 which selects and outputs one of the data according to the memory control signal MEM-CNT.

Referring to the operation of the data processing unit 6 configured as described above, when the output enable signal OE output from the color-lookup table 4 is enabled, the CDEG-D and the CDG-D are the three-state buffer 19. Is outputted to the offset units 21 and 22 through the " 20 ". In this case, the memory control signal MEM-CNT becomes 1 in the TV graphics mode, and the color data CLUT- of the color lookup table 4 is output. DATA) is output through the offset unit 21. The offset sections 21 and 22 output each of the most significant 4 bits of the R, G, and B data as CLUT-DATA, which is written to the color-lookup table 4 through the multiplexer 25. The lowest two bits are output as 10. When the extended active is the graphics mode and the memory control signal MEM-CNT is in one plan state, the multiplexer reads the data CLLUT-DATA read from the color-lookup table 4 through the one plan state part 24. Output through 25).

When the expandive is in graphics mode and the memory control signal MEM-CNT is in the dissolve effect, the mixer unit 23 adds CDEG-CLUT and CDG_CLUT in the color-lookup table 4, respectively, and multiplexer ( Output through 25). In addition, when the expandive is graphics and the memory control signal MEM-CNT is a secondary memory display, the output of the CDG-CLUT 2 is output through the offset unit 22 and the multiplexer 25.

As described in detail above, the present invention can be used to read and decode image data from a CD, and also to process extended TV graphics as well as CD graphics, all of which can be configured as digital logic. It has the effect of making it easy to make it.

Claims (7)

When the load command (LD-CLUT) is input, an address according to the load command is designated according to the state of the memory control (MEM-CNT), so that the write enable signal WE and the output enable signal ( A light control means for storing color data in R, G, and B form, and a light address (WR-ADDR) of the light control means and memory data (MEM-DATA) input from an external memory. Output enable signal ( Address control means for selecting and outputting the data, and the data read from the color-lookup table according to the memory control (MEM-CNT) state to R, G, and B as well as CDG-D and CDEG from the outside. And a data processing section (6) for writing data to said color-lookup table upon input. The method of claim 1, When the command to load data into the color-lookup table is input, the light control means executes the command during the blank period of horizontal synchronization (HSYNC) so as not to affect the image currently being displayed. Color-lookup table control. The apparatus of claim 1 or 2, wherein the write control means is adapted so that the timing of writing the data into the color-lookup table coincides with the start of the horizontal synchronization (HSYNC). . The method of claim 1, The write control means CDG-CLUT writes color data according to the memory address (MEM-CNT) applied from the outside and the write address ROM for determining an initial address to be written to the color-lookup table (CLUT) upon application of a load command. Write clock selection means for deciding whether to write to or write to the CDEG-CLUT, an ore gate for enabling the write clock selection means when a load instruction (LD-CLUT) is applied, and data output from the write address ROM. A light address counting means for increasing the write address WR-ADDR as the count is calculated, a JK flip flop for outputting a signal END due to the output of the OA gate and the fed back end output, and an output of the JK flip flop. Is a data input terminal and a deflip-flop for outputting the data synchronized with the horizontal synchronization (HSYNC) applied to the clock terminal (CLK); By inverting the output enable signal on the output of the flop ( And a signal to output a write enable signal WE, an address enable signal AD-EN and an end signal END as enabled by the output of the flip-flop. Means and a combination means for outputting a CDEG-WE signal and a CDG-WE signal produced by combining the signal output from the light clock selecting means and the signal output from the signal generating means. -Look-up table control. The method of claim 4, wherein Color-lookup table control apparatus of a CD graphics decoder, characterized in that the combining means comprises an end gate. The method of claim 1, And the address control means comprises a multiplexer. The method of claim 1, The data processing means is an output enable signal (outputted from the write control means) A three-state buffering means for buffering the CDEG-A and the CDG-D and outputting them through an offset means, and a mixing means for inputting the output data (CLUT-DATA) of the color-lookup table, and then outputting the added data. And one plan state means for transmitting the data received from the output data CLUT-DATA of the color-lookup table, and input terminals A, B, C, through the offset means, the mixing means, and the one plan state means. D) 4x1 multiplexing means for selecting and outputting one of the data input to the memory control signal (MEM-CNT) according to the color graphics table decoder.