參數資料
型號: TLC34076M-135
廠商: Texas Instruments, Inc.
英文描述: Color-Palette(135MHz,與TLC34075兼容,另具24位和16位真彩色模式)
中文描述: 顏色調色板(135MHz,與TLC34075兼容,另具24位和16位真彩色模式)
文件頁數: 55/57頁
文件大小: 456K
代理商: TLC34076M-135
C–1
Appendix C
SCLK Frequency < VCLK Frequency
The VCLK and SCLK outputs generated by the TLC34076M are both free-running clocks. The video control
signals (i.e., HSYNC, VSYNC, and BLANK) are normally generated from VCLK, and a fixed relationship
between the video control signals and VCLK can therefore be expected. The TLC34076M samples and
latches the BLANK input on the falling edge of VCLK. It then looks at the load signal to determine when to
disable or enable SCLK at its output terminal. The decision is determined when the SCLK frequency is
greater than or equal to the VCLK frequency. However, when the SCLK frequency is less than the VCLK
frequency, the appearance of the SCLK waveform at its output terminal when BLANK is sampled low on the
VCLK falling edge can vary (see Figures C–1 and C–2).
To avoid this variation in the SCLK output waveform, the SCLK and VCLK frequencies should be chosen
so that HTOTAL is evenly divisible by the ratio of (VCLK frequency:SCLK frequency).
remainder of
HTOTAL
VCLK frequency
SCLK frequency
0
For example, if HTOTAL is even, VCLK frequency = dot-clock frequency/8, and SCLK frequency = dot-
clock frequency/16, then the formula above is satisfied. NOTE: When HTOTAL starts at zero (as in the
TMS340x0 GSP), then the formula becomes:
remainder of
(HTOTAL
VCLK frequency
SCLK frequency
1)
0
VCLK
BLANK
LOAD
(internal signal
for data latch)
SCLK at
Output Terminal
Figure C–1. VCLK and SCLK Phase Relationship (Case 1)
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