ADV7180
YCMN[2:0], Luma Comb Mode NTSC, Address 0x38 [2:0]
Table 52. YCMN Function
CCMP[2:0], Chroma Comb Mode PAL, Address 0x39 [5:3]
Table 55. CCMP Function
YCMN[2:0] Description
Configuration
CCMP[2:0] Description
Configuration
0xx
(default)
Adaptive comb mode
Adaptive 3-line (three
taps) luma comb
0xx
(default)
Adaptive comb
mode
Adaptive 3-line chroma
comb for CTAPSP = 01
100
Disable luma comb
Use low-pass/notch
filter; see the Y Shaping
Filter section
Fixed 2-line (two taps)
luma comb
Fixed 3-line (three taps)
luma comb
Fixed 2-line (two taps)
luma comb
Adaptive 4-line chroma
comb for CTAPSP = 10
Adaptive 5-line chroma
comb for CTAPSP = 11
101
110
111
Fixed luma comb (top
lines of line memory)
Fixed luma comb (all
lines of line memory)
Fixed luma comb
(bottom lines of line
memory)
100
101
Disable chroma
comb
Fixed chroma comb
(top lines of line
memory)
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
PAL Comb Filter Settings
Used for PAL B/G/H/I/D, PAL M, PAL Combinational N,
PAL 60, and NTSC 4.43 CVBS inputs.
110
111
Fixed chroma comb
(all lines of line
memory)
PSFSEL[1:0], Split Filter Selection PAL, Address 0x19 [1:0]
The PSFSEL[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.
Fixed chroma comb
(bottom lines of line
memory)
Table 53. PSFSEL Function
PSFSEL[1:0] Description
Fixed 4-line chroma
comb for CTAPSP = 11
00
Narrow
Medium
Wide
01 (default)
10
11
YCMP[2:0], Luma Comb Mode PAL, Address 0x39 [2:0]
Table 56. YCMP Function
Widest
YCMP[2:0] Description
Configuration
CTAPSP[1:0], Chroma Comb Taps PAL, Address 0x39 [7:6]
0xx
(default)
Adaptive comb mode Adaptive five lines (three
taps) luma comb
Table 54. CTAPSP Function
CTAPSP[1:0] Description
100
101
110
111
Disable luma comb
Use low-pass/notch filter;
see the Y Shaping Filter
section.
Fixed three lines (two taps)
luma comb
00
01
Do not use
PAL chroma comb adapts five lines (three taps)
to three lines (two taps); cancels cross luma only
Fixed luma comb
(top lines of line
memory)
Fixed luma comb
(all lines of line
memory)
Fixed luma comb
(bottom lines of line
memory)
10
PAL chroma comb adapts five lines (five taps) to
three lines (three taps); cancels cross luma and
hue error less well
Fixed five lines (three taps)
luma comb
11 (default)
PAL chroma comb adapts five lines (five taps) to
four lines (four taps); cancels cross luma and hue
error well
Fixed three lines (two taps)
luma comb
Rev. A | Page 39 of 112
ADI [ ADI ]
