參數資料
型號： TVP3020-175
廠商： Texas Instruments, Inc.
英文描述： Video Interface PALETTE(視頻接口調色器)
中文描述： 視頻接口盒（視頻接口調色器）
文件頁數： 77/98頁
文件大?。?/td> 582K
代理商： TVP3020-175
B–1
Appendix B
RCLK Frequency < VCLK Frequency
The VCLK, RCLK, and SCLK outputs generated by the Viewpoint VIP are free-running clocks. The
video-control signals (i.e., HSYNC, VSYNC, and BLANK) are normally generated from VCLK, and a fixed
relationship between video-control signals and VCLK can be expected. Viewpoint samples and latches the
BLANK input on the falling edge of VCLK. It then looks at the internal RCLK signal to determine when to
enable or disable SCLK at the output terminal. The decision is determined when the RCLK frequency is
greater than or equal to the VCLK frequency. However, when the RCLK frequency is less than the VCLK
frequency, the appearance of the SCLK waveform at the output terminal (when BLANK is sampled low on
the falling edge of VCLK) can vary (see Figures B–1 and B–2).
To avoid this variation in the SCLK output waveform, the RCLK and VCLK frequencies should be chosen
so that HTOTAL is evenly divisible by the ratio of the VCLK frequency to the RCLK frequency:
remainder of [ HTOTAL/(VCLK frequency/RCLK frequency)] = 0
For example, if HTOTAL is even, VCLK frequency = DOTCLK frequency/8 and RCLK frequency = DOTCLK
frequency/16. Then the above formula is satisfied. NOTE: When HTOTAL starts at zero, then the formula
becomes:
remainder of [ (HTOTAL + 1)/(VCLK frequency/SCLK frequency) ] = 0.
VCLK
SYSBL
At Input
Terminal
RCLK
SCLK
Figure B–1. VCLK and SCLK Phase Relationship (Case 1)
VCLK
SYSBL
At Input
Terminal
RCLK
SCLK
Figure B–2. VCLK and SCLK Phase Relationship (Case 2)
相關PDF資料
PDF描述
TVP3020-135 Video Interface PALETTE(視頻接口調色器)
TVP3025-135 Video Interface PALETTE(三PLL，視頻接口調色器)
TVP3025-175 Video Interface PALETTE(三PLL，視頻接口調色器)
TVP3030-175 Video Interface PALETTE Exract(1600×1200，24位真彩色視頻接口調色器)
TVP3030-220 Video Interface PALETTE Exract(1600×1200，24位真彩色視頻接口調色器)
相關代理商/技術參數
參數描述
TVP3020-175MDN 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette
TVP3020-175PCE 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette
TVP3020-200MDN 制造商:Rochester Electronics LLC 功能描述:- Bulk
TVP3020-200PCE 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC)
TVP3020-220MDN 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette
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