ch7019 Chrontel, ch7019 Datasheet - Page 29

• Manufacturer Part Number: ch7019
• Description: Ch7019 Tv Encoder / Lvds Transmitter
• Manufacturer: Chrontel

CHRONTEL
CH7019B
The XCLK Detect block detects if XCLK is missing for more than approximately 1.2us.
The LOCKDET block and SYNCDET block can be defeated or bypassed independently through the LPMC register
(register 66h) controls. To defeat the LOCKDET block set LPFORC to ‘1’ and LPLEN to ‘1’; to defeat the SYNCDET
block set LSYNCEN to 1. The XCLK Detect block can be defeated or bypassed independently through the CLKDETD
bit in register 14h, bit 2. To defeat the XCLK Detect block set CLKDETD to ‘1’.
The order of programming the control registers for the power up sequence is very important. Both LPLOCK and
SYNCST must read as 1 before setting PANEN to 1. Doing so will eliminate unexpected results on the LCD panel.
2.4.6
Clock for Emission Reduction
LVDS data path can support a +- 2.5% spread spectrum clock to reduce EMI emission. The frequency and amplitude of
the spread spectrum triangle waveform can be programmed via the serial port. Please refer to AN-59 for details.
201-0000-048
Rev. 2.4,
12/18/2006
29