Datasheet

2−31
2.20.26 Chrominance Control #2 Register
Address 1Bh
Default 14h
7 6 5 4 3 2 1 0
Chrominance comb filter mode [3:0] Reserved WCF Chrominance filter select
Chrominance comb filter mode [3:0] (CM[3:0]): Chrominance control #2 register 1Bh, bits 7−4
ACE: chrominance control #1 register 1Ah, bit 3
CE: chrominance control #1 register 1Ah, bit 2
ACE CE CM[3] CM[2] CM[1] CM[0] COMB FILTER SELECTION
0 0 X X X X Comb filter disabled
0 1 0 0 0 X Fixed 3-line comb filter with (1, 2, 1)/4 coefficients
0 1 0 0 1 X Fixed 3-line comb filter with (1, 0, 1)/2 coefficients
0 1 1 0 X X Fixed 2-line comb filter
0 1 0 1 0 X Fixed 4-line (1, 1, 1, 1)/4 comb filter
0 1 0 1 1 X Fixed 4-line (1, 3, 3, 1)/8 comb filter
0 1 1 1 X X Fixed 2-line comb filter
1 X X 0 0 0 Adaptive between 3-line (1, 2, 1)/4 and 2-line comb filter
1
†
X X 0
†
0
†
1
†
Adaptive between 3-line (1, 2, 1)/4 comb filter and no comb filter
1 X X 0 1 0 Adaptive between 3-line (1, 0, 1)/2 comb filter and 2-line comb filter
1 X X 0 1 1 Adaptive between 3-line (1, 0, 1)/2 comb filter and no comb filter
1 X X 1 0 0 Adaptive between 4-line (1, 1, 1, 1)/4 and 2-line comb filter
1
‡
X X 1
‡
0
‡
1
‡
Adaptive between 4-line (1, 1, 1, 1)/4 comb filter and no comb filter
1 X X 1 1 0 Adaptive between 4-line (1, 3, 3, 1)/8 comb filter and 2-line comb filter
1 X X 1 1 1 Adaptive between 4-line (1, 3, 3, 1)/8 comb filter and no comb filter
†
Indicates default settings for NTSC
‡
Indicates default settings for PAL mode
Wideband chroma filter (WCF):
0 = Disable
1 = Enable (default)
Chrominance filter select:
00 = No notch (default)
01 = Notch 1
10 = Notch 2
11 = Notch 3
Chrominance output bandwidth (MHz):
WCF FILTER SELECT NTSC/PAL/SECAM ITU-R BT.601
00 1.2214
0
01 0.8782
0
10 0.7297
11 0.4986
00 1.4170
1
01 1.0303
1
10 0.8438
11 0.5537