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ADV473KP66 Fiches technique(PDF) 8 Page - Analog Devices |
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ADV473KP66 Fiches technique(HTML) 8 Page - Analog Devices |
8 / 12 page ADV473 –8– REV. A Command Register (CR) The ADV473 has an internal command register (CR). This reg- ister is 8 bits wide, CR0–CR7 and is directly mapped to the MPU data bus on the part, D0–D7. The command register can be written to or read from. It is not initialized, therefore it must be set. Figure 4 shows what each bit of the CR register controls and shows the values it must be programmed to for various modes of operation. Color Modes The ADV473 supports four color modes, 24-bit true-color, 15-bit true-color, 8-bit true-color and 8-bit pseudo-color. The mode of operation is determined by the S0 and S1 inputs, in conjunction with CR7 and CR6 of the command register. S0 and S1 are pipelined to maintain synchronization with the video data. Table III illustrates the modes of operation. Table III. Color Operation Modes OL3–OL0 S1, S0 CR7, CR6 Mode R7–R0 G7–G0 B7–B0 1111 XX XX Overlay Color 15 XXH XXH XXH . . . . ... . . . . ... 0001 XX XX Overlay Color 1 XXH XXH XXH 0000 00 00 24-Bit True-Color R7–R0 G7–G0 B7–B0 0000 00 01 24-Bit True-Color R7–R0 G7–G0 B7–B0 0000 00 10 24-Bit True-Color R7–R0 G7–G0 B7–B0 0000 00 11 Reserved Reserved Reserved Reserved 0000 01 00 24-Bit True-Color Bypass R7–R0 G7–G0 B7–B0 0000 01 01 24-Bit True-Color Bypass R7–R0 G7–G0 B7–B0 0000 01 10 24-Bit True-Color Bypass R7–R0 G7–G0 B7–B0 0000 01 11 Reserved Reserved Reserved Reserved 0000 10 00 8-Bit Pseudo-Color (Red) P7–P0 Ignored Ignored 0000 10 01 8-Bit Pseudo-Color (Green) Ignored P7–P0 Ignored 0000 10 10 8-Bit Pseudo-Color (Blue) Ignored Ignored P7–P0 0000 10 11 15-Bit True-Color Orrrrrgg gggbbbbb Ignored 0000 11 00 8-Bit True-Color Bypass (Red) rrrgggbb Ignored Ignored 0000 11 01 8-Bit True-Color Bypass (Green) Ignored rrrgggbb Ignored 0000 11 10 8-Bit True-Color Bypass (Blue) Ignored Ignored rrrgggbb 0000 11 11 15-Bit True-Color Bypass Orrrrrgg gggbbbbb Ignored X = Don’t Care CONTROL OUTPUTS THESE BITS ARE OUTPUT ONTO THE CR3-CR0 PINS CR5 0 1 0 IRE 7.5 IRE PEDESTAL ENABLE CONTROL (SETUP) CR4 0 1 6-BIT 8-BIT 8-BIT/6-BIT COLOR SELECT COLOR MODE SELECT (SEE TABLE III) CR5 CR4 CR3 CR2 CR1 CR7 CR6 CR0 Figure 4. Command Register (CR) |
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Description similaire - ADV473KP66 |
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