tw9910 ETC-unknow, tw9910 Datasheet - Page 10

• Manufacturer Part Number: tw9910
• Description: Power Ntsc/pal/secam Video Decoder With Slicer
• Manufacturer: ETC-unknow

TW9910
Output Interface
TECHWELL, INC.
2nd byte
ITU-R BT.656
ITU-R BT.656 defines strict EAV/SAV Code, video data output timing, H blanking timing, and V
Blanking timing. In this mode, VD[15:8] pins are only effective and CLKx2 pin should be used for data
clock signal. EAV/SAV Code format is shown as follows. Bit 7 of forth byte in EAV/SAV code must be
“1” in ITU-R BT.656 standard. For that reason, VIPCFG Register bit must be set to “1”.
3rd byte
ITU-R BT.656 for 525-line system has 244 video active lines in odd field and 243 vide active lines in
even field. NTSC656 register bit controls this video active line length.
Horizontal Down Scaling Output
TW9910 generates Horizontal down scaling output data. Figure 2 shows 8 bit mode Horizontal Down
Scaling output timing. As shown on Figure 2, Horizontal Down Scaled data are generated by
continuous data stream. The trailing edge of DVALID signal changes with the trailing edge of HACTIVE
signal. Data value from the leading edge of HACTIVE to the leading edge of DVALID is programmable
by CNTL656 register. If CNTL656 is set to “1”, all Y and CbCr data will be 0x00. If CNTL656 is set to
“0”, all Y data will be 0x10 and all CbCr data will be 0x80. VIP application normally uses 0x00 data as
invalid data. Figure 2 shows 360 active pixels output timing after horizontal downscaling.
4th byte *C
1st byte
For complete IRU-R BT.656 standard, following setting is recommended.
VD15 VD14 VD13 VD12
1
0
0
VACTIVE
HACTIVE
NTSC656
VDELAY
Register
VIPCFG
HA_EN
MODE
LEN
1
0
0
F
Table3. ITU-R BT.656 SAV and EAV code sequence
V
1
0
0
Table 4. ITU-R BT.656 Register set up
525 line system
H
1
0
0
0X0F4
0x2D0
0x012
1
0
1
1
1
V XOR H
10
VD11
1
0
0
F XOR H
VD10
625 line system
1
0
0
0x2D0
0x018
0x120
1
0
1
1
0
F XOR V F XOR V XOR H
*C is set by VIPCFG register bit.
VD9
1
0
0
Low Power NTSC/PAL/SECAM
Video Decoder with VBI Slicer
VD8
1
0
0
09/21/2006
REV.
A