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ADV7152LS85 数据表(PDF) 13 Page - Analog Devices |
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ADV7152LS85 数据表(HTML) 13 Page - Analog Devices |
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13 / 32 page  ADV7152 –13– REV. B Pipeline Delay and On-Board Calibration The ADV7152 has a fixed number of pipeline delays (tPD), so long as timings t10 and τ-t 11 are met. However, if a fixed pipeline delay is not a requirement, timings t10 and τ-t11 can be ignored, a calibration cycle must be run and there is no restriction on LOADIN to LOADOUT timing. If timings t10 and τ-t 11 are not met, the part will function correctly though with an increased number of pipeline delays, tPD + N CLOCKS (for 2:1 mode N = 2, for 1:1 mode N = 0). The ADV7152 has onboard cali- bration circuitry which synchronizes pixel data and LOADIN with the internal ADV7152 clocking signals. Calibration can be performed in two ways: during the devices initialization se- quence by toggling two bits of the Mode Register, MR10 fol- lowed by MR15, or by writing a “1” to Bit CR10 of Command Register 1 which executes a calibration on every Vertical Sync. COLOR VIDEO MODES The ADV7152 supports a number of color video modes all at the maximum video rate. Command bits CR24–CR27 of Com- mand Register 2 along with Bit MR11 of Mode Register 1 deter- mine the color mode. 24-Bit “Gamma” True Color (CR25, CR26, CR27 = 1, 1, 1 and MR11 = 1) The part is set to 24-bit/30-bit True-Color operation. The pixel port accepts 24 bits of color data which is directly mapped to the Look-Up Table RAM. The Look-Up Table is configured as a 256 location by 30 bits deep RAM (10 bits each for Red, Green and Blue). The output of the RAM drives the DACs with 30-bit data (10 bits each for Red, Green and Blue). The RAM is preloaded with a user determined, nonlinear function, such as a gamma correction curve. 10 RED 256 x 10 GREEN 256 x 10 BLUE 256 x 10 10-BIT GREEN DAC 10 10 8 24-BIT PIXEL DATA 24-BIT TO 30-BIT LOOK-UP-TABLE 30-BIT COLOR DATA ANALOG VIDEO OUTPUTS RED OUT GREEN OUT BLUE OUT 10-BIT BLUE DAC 10-BIT RED DAC 8 8 Figure 17. 24-Bit to 30-Bit True-Color Configuration This mode allows for the display of full 24-bit, Gamma- Corrected True-Color Images. 24-Bit “Standard” True Color (CR25, CR26, CR27 = 1, 1, 1 and MR11 = 0) This mode sets the part into direct 24-bit True-Color operation. The pixel port accepts 24 bits of color data which is directly mapped to Look-Up Table RAM. The Look-Up Table is con- figured as a 256 location by 24 bits deep RAM (8 bits each for Red, Green and Blue) and essentially acts as a bypass RAM. The output of the RAM drives the DACs with 24-bit data (8 bits each for Red, Green and Blue). The RAM is preloaded with a linear function. This mode allows for the display of full 24-bit True-Color Images. 8 RED 256 x 8 GREEN 256 x 8 BLUE 256 x 8 8-BIT GREEN DAC 8 8 8 24-BIT PIXEL DATA 24-BIT TO 24-BIT LOOK-UP-TABLE 24-BIT COLOR DATA ANALOG VIDEO OUTPUTS RED OUT GREEN OUT BLUE OUT 8-BIT BLUE DAC 8-BIT RED DAC 8 8 Figure 18. 24-Bit to 24-Bit Direct True-Color Configuration 8-Bit “Gamma” Pseudo Color (CR25, CR26, CR27 = X, 0, 0 or X, 1, 0 or X, 0, 1 and MR11 = 1) This mode sets the part into 8-bit Pseudo-Color operation. The pixel port accepts 8 bits of pixel data which indexes a 30-bit word in the Look-Up Table RAM. The Look-Up Table is con- figured as a 256 location by 30 bits deep RAM (10 bits each for Red, Green and Blue). The output of the RAM drives the DACs with 30-bit data (10 bits each for Red, Green and Blue). 10 RED 256 x 10 GREEN 256 x 10 BLUE 256 x 10 10-BIT GREEN DAC 10 10 8 8-BIT PIXEL DATA 8-BIT TO 30-BIT LOOK-UP-TABLE 30-BIT COLOR DATA ANALOG VIDEO OUTPUTS RED OUT GREEN OUT BLUE OUT 10-BIT BLUE DAC 10-BIT RED DAC Figure 19. 8-Bit to 30-Bit Pseudo-Color Configuration This mode allows for the display of 256 simultaneous colors out of a total palette of millions of addressable colors. 8-Bit “Standard” Pseudo Color (CR25, CR26, CR27 = X, 0, 0 or X, 1, 0 or X, 0, 1 and MR11 = 0) This mode sets the part into 8-bit Pseudo-Color operation. The pixel port accepts 8 bits of pixel data which indexes a 24-bit word in the Look-Up Table RAM. The Look-Up Table is con- figured as a 256 location by 24 bits deep RAM (10 bits each for Red, Green and Blue). The output of the RAM drives the DACs with 24-bit data (8 bits each for Red, Green and Blue). 8 RED 256 x 8 GREEN 256 x 8 BLUE 256 x 8 8-BIT GREEN DAC 8 8 8 8-BIT PIXEL DATA 8-BIT TO 24-BIT LOOK-UP-TABLE 24-BIT COLOR DATA ANALOG VIDEO OUTPUTS RED OUT GREEN OUT BLUE OUT 8-BIT BLUE DAC 8-BIT RED DAC Figure 20. 8-Bit to 24-Bit Pseudo-Color Configuration |
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