HMP8117_07 Datasheet, PDF (25/45 Pages) Intersil Corporation – NTSC/PAL Video Decoder

HMP8117
TABLE 16. ANALOG INPUT CONTROL REGISTER
BIT
NO.
FUNCTION
SUB ADDRESS = 05_H
DESCRIPTION
RESET
STATE
7-6
Lock Loss
Video Gain
Select
If bits 5-4 do not equal “01”, these bits indicate what mode the AGC circuitry will be after loss of
00_B
sync. If bits 5-4 equal “01”, these bits are ignored.
00 = Automatic gain control: bits 5-4 will be reset to “01”
01 = Maintain fixed gain: bits 5-4 will not be changed
10 = Normal AGC switching to fixed gain after lock achieved: bits 5-4 will not be reset to “01”
unless they indicated “freeze automatic gain control”
11 = reserved
5-4
Video Gain
00 = Fixed 1x gain
01_B
Control Select
01 = Automatic gain control
10 = Fixed gain control. (Use gain factor from Video Gain Adjust register 1D_H.)
11 = Freeze automatic gain control
3
Digital Anti-Alias 0 = Internal digital anti-alias filter is active.
0_B
Filter Control
1 = Internal digital anti- alias filter is bypassed. (Not Recommended)
2-0
Video Signal
Input Select
000 = CVBS1
001 = CVBS2
010 = CVBS3
011 = S-video
1XX = reserved
000_B
TABLE 17. COLOR PROCESSING REGISTER
BIT
NO.
FUNCTION
SUB ADDRESS = 06_H
DESCRIPTION
RESET
STATE
7-6
Digital Color Gain 00 = No gain control (gain = 1x)
01_B
Control Select
01 = Automatic gain control
10 = Fixed gain control. (Use gain factor from Color Gain Adjust register 1C_H.)
11 = Freeze automatic gain control
5-4
Color Killer
00 = Force color on
01_B
Select
01 = Enable color killer
10 = reserved
11 = Force color off
3-2
Color Coring
Coring may be used to reduce low-level noise in the CbCr signals.
00_B
Select
00 = No coring
01 = 1 code coring
10 = 2 code coring
11 = 3 code coring
1
Contrast Control This bit specifies whether the contrast control affects just the Y data (“0”) or both the Y and CbCr
1_B
Select
data (“1”). To avoid color shifts when changing contrast, this bit should be a “1”.
0 = Contrast controls only Y data
1 = Contrast controls Y and CbCr data
0
Color Low-Pass
This bit selects the bandwidth of the CbCr data.
0_B
Filter Select
0 = 850kHz
1 = 1.5MHz
25
FN4643.3
April 19, 2007