cx25840 Conexant Systems, Inc., cx25840 Datasheet - Page 234

• Manufacturer Part Number: cx25840
• Description: Video Decoder And Broadcast Audio
• Manufacturer: Conexant Systems, Inc.

Register Map
5-92
Video Detect Configuration
[7:6]
[5:4]
[3]
VGA Gain Control
[7:6]
[5:0]
AGC Gain Control Low
[7:0]
AGC Gain Control High
[7:6]
[5:4]
[3:0]
Bits
Bits
Bits
Bits
RW
RW
RZ
RZ
RW,IS
W
RW,IS
W
RZ
RW
RW,IS
W
Type
Type
Type
Type
01
00
0
00
0x20
0x00
0x0
10
0x1
Default
Default
Default
Default
RESERVED
CLAMP_SKIP_CNT
AGC_GAIN_HIGH
DEBOUNCE_COUNT
VT_LINE_CNT_HYST
RESERVED
RESERVED
VGA_GAIN
AGC_GAIN_LOW
Name
Name
Name
Name
Conexant
R/W register for VGA gain (can be written when
VGA_AUTO_EN = 0)
Lower byte of the 12 bit value for AGC digital gain (can be
written when AGC_AUTO_EN = 0)
Number of lines to skip analog clamping. Only applicable to
-24 part.
Upper nibble of the 12 bit value for AGC digital gain (can be
written when AGC_AUTO_EN = 0)
Number of consecutive fields of detected video format stability
required before switching video formats. This period is
provided to help prevent erroneous switching due to noise or
other short-term errors.
00 = 2 consecutive fields of stability
01 = 4 consecutive fields of stability
10 = 8 consecutive fields of stability
11 = 16 consecutive fields of stability
Number of consecutive fields with approximately 525/2 or
625/2 lines before changing the detected line count.
00 = 2 consecutive fields with approximately 525/2 or 625/2
lines
01 = 4 consecutive fields with approximately 525/2 or 625/2
lines
10 = 8 consecutive fields with approximately 525/2 or 625/2
lines
11 = 16 consecutive fields with approximately 525/2 or 625/2
lines
Description
Description
Description
Description
CX25840/1/2/3 Data Sheet
Address 0x48A
Address 0x487
Address 0x488
Address 0x489
102284B
8/3/05