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ADV7180

Rev. A | Page 39 of 112

YCMN[2:0], Luma Comb Mode NTSC, Address 0x38 [2:0]

Table 52. YCMN Function

YCMN[2:0]

Description

Configuration

0xx

(default)

Adaptive comb mode

Adaptive 3-line (three

taps) luma comb

100

Disable luma comb

Use low-pass/notch

filter; see the Y Shaping

Filter section

101

Fixed luma comb (top

lines of line memory)

Fixed 2-line (two taps)

luma comb

110

Fixed luma comb (all

lines of line memory)

Fixed 3-line (three taps)

luma comb

111

Fixed luma comb

(bottom lines of line

memory)

Fixed 2-line (two taps)

luma comb

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.

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.

Table 53. PSFSEL Function

PSFSEL[1:0]

Description

Narrow

01 (default)

Medium

Wide

Widest

CTAPSP[1:0], Chroma Comb Taps PAL, Address 0x39 [7:6]

Table 54. CTAPSP Function

CTAPSP[1:0]

Description

Do not use

PAL chroma comb adapts five lines (three taps)

to three lines (two taps); cancels cross luma only

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

CCMP[2:0], Chroma Comb Mode PAL, Address 0x39 [5:3]

Table 55. CCMP Function

CCMP[2:0]

Description

Configuration

Adaptive 3-line chroma

comb for CTAPSP = 01

Adaptive 4-line chroma

comb for CTAPSP = 10

0xx

(default)

Adaptive comb

mode

Adaptive 5-line chroma

comb for CTAPSP = 11

100

Disable chroma

comb

Fixed 2-line chroma

comb for CTAPSP = 01

Fixed 3-line chroma

comb for CTAPSP = 10

101

Fixed chroma comb

(top lines of line

memory)

Fixed 4-line chroma

comb for CTAPSP = 11

Fixed 3-line chroma

comb for CTAPSP = 01

Fixed 4-line chroma

comb for CTAPSP = 10

110

Fixed chroma comb

(all lines of line

memory)

Fixed 5-line chroma

comb for CTAPSP = 11

Fixed 2-line chroma

comb for CTAPSP = 01

Fixed 3-line chroma

comb for CTAPSP = 10

111

Fixed chroma comb

(bottom lines of line

memory)

Fixed 4-line chroma

comb for CTAPSP = 11

YCMP[2:0], Luma Comb Mode PAL, Address 0x39 [2:0]

Table 56. YCMP Function

YCMP[2:0]

Description

Configuration

0xx

(default)

Adaptive comb mode

Adaptive five lines (three

taps) luma comb

100

Disable luma comb

Use low-pass/notch filter;

see the Y Shaping Filter

section.

101

Fixed luma comb

(top lines of line

memory)

Fixed three lines (two taps)

luma comb

110

Fixed luma comb

(all lines of line

memory)

Fixed five lines (three taps)

luma comb

111

Fixed luma comb

(bottom lines of line

memory)

Fixed three lines (two taps)

luma comb

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