msm7661b Oki Semiconductor, msm7661b Datasheet - Page 14

• Manufacturer Part Number: msm7661b
• Description: Ntsc/pal Digital Video Decoder
• Manufacturer: Oki Semiconductor

¡ Semiconductor
4.
This is a synchronizing signal processing block.
Chip output synchronizing signals and synchronizing signals for internal use are generated by
this block. Various signals are output in this block and the following operation modes can be
selected.
1) SYNC threshold level adjustment
2-1) Fine adjustment of HSY signal (start side)
2-2) Fine adjustment of HSY signal (stop side)
3) HSY signal enable select
4) Fine adjustment of HSYNC_L signal
5-1) Fine adjustment of HVALID signal (start side)
5-2) Fine adjustment of HVALID signal (stop side)
6-1) Fine adjustment of VVALID signal (start side)
6-2) Fine adjustment of VVALID signal (stop side)
The data signals are transmitted or received at the rising edge of the HVALID signal.
7) TV, VTR mode select
The TV mode outputs a fixed pixel number per one line and absorbs a jitter that does not appear
on the TV receiver normally.
The VTR mode outputs the results of decoding in accordance with the HSYNC signal regardless
of whether a jitter exists or not.
High Level
Active*
These signal are used to sync chip and clamp timing to the A/D converter
TV mode
VTR mode*
Synchronization Block
MSM7661B
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