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MCD212 Datasheet(PDF) 51 Page - Motorola, Inc |
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MCD212 Datasheet(HTML) 51 Page - Motorola, Inc |
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51 / 87 page  MCD212 6–2 MOTOROLA 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 7 654 321 0 7 65432 1 0 1ST BYTE 2ND BYTE MEMORY DATA BUS MD15 – MD0 PIXEL 1 PIXEL 2 Figure 6–1. Bitmap Serialization in 8 Bits/Pixel 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1ST NIBBLE MEMORY DATA BUS MD15 – MD0 2ND NIBBLE 3RD NIBBLE 4TH NIBBLE BIT BIT BIT BIT BIT BIT BIT BIT 3 2 1 0 32 1 0 32 1 0 32 1 0 PIXEL 1 PIXEL 2 PIXEL 3 PIXEL 4 Figure 6–2. Bitmap Serialization in 4 Bits/Pixel 6.2 RUN-LENGTH FILE The run–length coding technique permits file compression by grouping into one block consecutive pixels that have the same color. The VDSC uses either a 7– or a 3–bit color look up table (CLUT) to provide either 1 out of 128 colors or 1 out of 8 different colors. The run–length compression is applied to each video line independently of the others. The run–length file is organized as a list of information about pixels without any notion of width or height as in bitmap files. (Refer to Section 7.2, CLUT De- coder.) 6.2.1 Run-length 7-Bit CLUT Files Run–length 7–bit CLUT files are either a single byte (for a single pixel) or two bytes (for a run of pixels on a single line) in length. A 0 in the first bit indicates a single pixel CLUT address whereas a 1 in the first bit indicates a run of pixels on the present line. The run only extends to the end of the line and does not continue to the next line. The second byte indicates the number of identical pixels to be reproduced on the current line. A 0 in the second byte indicates that this color is to be repeated to the end of the line. A 1 is forbidden in the second byte. The eight bits allowed for 2 to 255 identical bits to be repeated or with a 0, the rest of the line will have the same pixel repeated. Every line must finish with a “zero–length” run (N = 0), which means that at a minimum, the last two pixels of the line are identical. Figure 6–3 shows the format for both. SINGLE PIXEL MULTIPLE PIXELS 0 1 7–BIT CLUT ADDRESS 7–BIT CLUT ADDRESS 76 0 15 14 8 7 0 NOTE: N = 0 means “duplicate this pixel to the end of the line”. N = 1 is forbidden. N = NUMBER OF IDENTICAL PIXELS (8 BITS) Figure 6–3. Run–length Format in 7 Bits/Pixel |
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