ADV7180
Data Sheet
CCMP[2:0], Chroma Comb Mode PAL, Address 0x39[5:3]
YCMN[2:0], Luma Comb Mode NTSC, Address 0x38[2:0]
Table 59. CCMP Function
Table 56. YCMN Function
CCMP[2:0]
Description
Configuration
YCMN[2:0]
Description
Configuration
000 (default)
Adaptive comb mode
Adaptive three-line
chroma comb for
CTAPSN = 01
Adaptive four-line
chroma comb for
CTAPSN = 10
Adaptive five-line
chroma comb for
CTAPSN = 11
000 (default) Adaptive comb mode Adaptive three-line
(three taps) luma comb
100
Disable luma comb
Use low-pass/notch
filter; see the Y Shaping
Filter section
101
110
111
Fixed luma comb (top Fixed two-line (two
lines of line memory)
taps) luma comb
Fixed luma comb (all
lines of line memory)
Fixed three-line (three
taps) luma comb
100
101
Disable chroma comb
Fixed luma comb
(bottom lines of line
memory)
Fixed two-line (two
taps) luma comb
Fixed chroma comb
(top lines of line
memory)
Fixed two-line chroma
comb for CTAPSN = 01
Fixed three-line chroma
comb for CTAPSN = 10
Fixed four-line chroma
comb for CTAPSN = 11
PAL Comb Filter Settings
These settings are 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 Fixed three-line chroma
lines of line memory)
comb for CTAPSN = 01
Fixed four-line chroma
comb for CTAPSN = 10
Fixed five-line chroma
comb for CTAPSN = 11
Fixed two-line chroma
comb for CTAPSN = 01
Fixed three-line chroma
comb for CTAPSN = 10
Fixed four-line chroma
comb for CTAPSN = 11
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 57. PSFSEL Function
PSFSEL[1:0] Description
00
Narrow
Medium
Wide
01 (default)
10
11
YCMP[2:0], Luma Comb Mode PAL, Address 0x39[2:0]
Table 60. YCMP Function
Widest
CTAPSP[1:0], Chroma Comb Taps PAL, Address 0x39[7:6]
YCMP[2:0]
Description
Configuration
000 (default) Adaptive comb mode
Adaptive five lines (three
taps) luma comb
Use low-pass/notch filter;
see the Y Shaping Filter
section
Fixed three lines (two
taps) luma comb
Fixed five lines (three taps)
luma comb
Table 58. CTAPSP Function
CTAPSP[1:0] Description
100
Disable luma comb
00
01
Do not use.
PAL chroma comb adapts five lines (three taps)
to three lines (two taps); cancels cross luma only
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)
10
PAL chroma comb adapts five lines (five taps) to
three lines (three taps); cancels cross luma and
hue error less well
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. G | Page 42 of 120
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