Appendix C Autoconfiguration Mode Register Values and Details
CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table C-5. CX25870/871 Register Values for Autoconfiguration Modes 22–26 (1 of 2)
Autoconfiguration Mode #
22
23
24
25
26
Auto-Config Register (index
0xB8) Hexadecimal Value:
26
27
30
31
32
Purpose of Mode:
Desktop
Desktop
Boot-Up
Screen
Boot-Up
Screen
Desktop
Type of Digital Input:
Active Resolution:
Overscan Ratio:
YCrCb
800x600
Lower
13.79
YCrCb
RGB
RGB
RGB
800x600
Standard
16.42
720x400
Standard
17.47
720x400
Standard
15.12
1024x768
Lower
11.97
Horizontal Overscan
Ratio/Percentage (HOC):
Vertical Overscan
Ratio/Percentage (VOC):
13.58
0.21
15.97
0.45
17.70
–0.23
13.19
1.93
11.93
0.04
Overscan Percentages Delta
(HOC - VOC):
H_CLKI = HTOTAL
1176
750
950
775
131
1053
525
1305
500
1170
945
VLINES_I = VTOTAL
H_BLANKI = Horizontal
Blanking Region
329
291
411
127
V_BLANKI = Vertical
Blanking Region
94
109
76
64
115
Type of Video Output:
Frequency of CLK (Hz)
Type of Clock:
NTSC
PAL-BDGHI
36812508
Pixel Only
NTSC
PAL-BDGHI
32625000
NTSC
52867138
33136345
66272724
Pixel Only
Pixel or
Character
Pixel or
9-Character
only
Pixel or
9-Character
only
Register
Value
Register
Value
Register
Value
Register
Value
Register
Value
Register Address
0x38
0x76
0x78
0x7A
0x7C
0x7E
0x80
0x82
0x84
0x86
0x88
20
C0
20
A6
BA
98
D9
22
D4
38
00
00
34
20
AE
CE
A0
2B
2D
F4
39
00
00
3A
D0
9C
B0
88
DD
27
CA
28
00
00
28
D0
9A
B6
80
E3
29
FC
28
00
20
F8
00
D0
EA
E0
37
21
D7
4A
00
C-10
Conexant
100381B
CONEXANT [ CONEXANT SYSTEMS, INC ]
