ADV7181 AD [Analog Devices], ADV7181 Datasheet - Page 35

• Manufacturer Part Number: ADV7181
• Description: Multiformat SDTV Video Decoder
• Manufacturer: AD [Analog Devices]

PAL Comb Filter Settings
Used for PAL-B/G/H/I/D, PAL-M, PAL-Combinational N,
PAL-60, and NTSC443 CVBS inputs.
PSFSEL[1:0] Split Filter Selection PAL, Address 0x19 [1:0]
The NSFSEL[1:0] control selects how much of the overall signal
bandwidth is fed to the combs. A wide split filter selection
eliminates dot crawl, but shows imperfections on diagonal lines.
The opposite is true for selecting a narrow bandwidth split filter.
CTAPSP[1:0] Chroma Comb Taps PAL, Address 0x39 [7:6]
Table 47. CTAPSP Function
CTAPSP[1:0]
00
01
10
11 (default)
CCMP[2:0] Chroma Comb Mode PAL, Address 0x39 [5:3]
Table 48. CCMP Function
CCMP[2:0]
0xx (default)
100
101
110
111
YCMP[2:0] Luma Comb Mode PAL, Address 0x39 [2:0]
Table 49. YCMP Function
YCMP[2:0]
0xx (default)
100
101
110
111
Description
Adaptive comb mode.
Disable chroma comb.
Fixed chroma comb (top lines of line memory).
Fixed chroma comb (all lines of line memory).
Fixed chroma comb (bottom lines of line memory).
Description
Adaptive comb mode.
Disable luma comb.
Fixed luma comb (top lines of line memory).
Fixed luma comb (all lines of line memory).
Fixed luma comb (bottom lines of line memory).
Description
Do not use.
PAL chroma comb adapts 5 lines (3 taps) to
3 lines (2 taps); cancels cross luma only.
PAL chroma comb adapts 5 lines (5 taps) to
3 lines (3 taps); cancels cross luma and hue error less well.
PAL chroma comb adapts 5 lines (5 taps) to
4 lines (4 taps); cancels cross luma and hue error well.
Rev. 0 | Page 35 of 96
Adaptive 5 lines (3 taps) luma comb.
Use low-pass/notch filter; see the Y Shaping Filter section.
Fixed 5 lines (3 taps) luma comb.
Fixed 3 lines (2 taps) luma comb.
Configuration
Fixed 3 lines (2 taps) luma comb.
Table 46. PSFSEL Function
PSFSEL[1:0]
00
01 (default)
10
11
Configuration
Adaptive 3-line chroma comb for CTAPSP = 01.
Adaptive 4-line chroma comb for CTAPSP = 10.
Adaptive 5-line chroma comb for CTAPSP = 11.
Fixed 2-line chroma comb for CTAPSP = 01.
Fixed 3-line chroma comb for CTAPSP = 10.
Fixed 4-line chroma comb for CTAPSP = 11.
Fixed 3-line chroma comb for CTAPSP = 01.
Fixed 4-line chroma comb for CTAPSP = 10.
Fixed 5-line chroma comb for CTAPSP = 11.
Fixed 2-line chroma comb for CTAPSP = 01.
Fixed 3-line chroma comb for CTAPSP = 10.
Fixed 4-line chroma comb for CTAPSP = 11.
Description
Narrow
Medium
Wide
Widest
ADV7181B