參數(shù)資料
型號(hào)： TVP3703-170
廠商： Texas Instruments, Inc.
英文描述： Video Interface PALETTE Exract(雙PLL，先進(jìn)的視頻接口調(diào)色器)
中文描述： 視頻接口調(diào)色板Exract（雙鎖相環(huán)，先進(jìn)的視頻接口調(diào)色器）
文件頁(yè)數(shù)： 10/21頁(yè)
文件大小： 427K
代理商： TVP3703-170
TVP3703
VIDEO INTERFACE PALETTE
TRUE-COLOR CMOS RAMDAC
SLAS100 – MARCH 1996
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
use of the hardware CRC feature (continued)
4.
Set BLANK high.
5.
Run for ten PCLK cycles.
6.
Set BLANK low.
7.
Run for 1200 dot clock cycles.
8.
Set 0x5555 on pixel bus input.
9.
Run for 20 PCLK cycles.
10. Set 0x0000 on the pixel bus input.
11. Run for three PCLK cycles.
12. Set bit 2 of the CRC test register to 0 and bit 1 to 1.
13. Wait for > 240 PCLK cycles.
14. Wait 1200 dot clock cycles.
15. Read the CRC low and high byte registers for the CRC result.
The CRC technique allows an authoritative check to be performed between the intended display and the actual
display at full video rates. For a given image (which can be an application’s image or a specially prepared test
screen), theoretically derived CRC values are calculated for each RGB color, which are then compared with the
TVP3703 hardware CRC values. Alternatively, the CRC value from a known good screen can be used as the
reference.
The CRC facility on the TVP3703 can be used to validate correct operation of:
The TVP3703 device in isolation
The TVP3703 device designed into, and working in, a VGA board
The DRAM, controller, and data path on the VGA board
The disk and bus operation of the host PC
MS-Windows
(and device drivers) on the PC
The horizontal and vertical synchronization waveforms or timings do not affect hardware CRC accumulation.
Any discrepancy between the calculated and TVP3703 hardware accumulated CRC values indicates a problem
in the device or system being used.
The CRC logic on the TVP3703 is normally powered down. To perform a CRC test, bit 2 of the CRC test register
(index FFD6h) should be reset to 0 and returned to 1 afterwards to return to the default condition.
The CRC mechanism does not check the DAC outputs (i.e., what is physically being displayed on the monitor);
these can be tested using the TVP3703 SENSE output (generally readable as a register bit on the VGA
controller).
MS-Windows is a registered trademark of Microsoft Corporation.
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
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