HMP8116 Datasheet, PDF (27/43 Pages) Intersil Corporation – NTSC/PAL Video Decoder

HMP8116
TABLE 15. 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
00_B
loss of 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
Control Select
If a value of “10”, the video gain adjust register is used to specify the amount of video gain
01_B
to be applied.
00 = Fixed 1x gain
01 = Automatic gain control
10 = Fixed gain control
11 = Freeze automatic gain control
3
Digital Anti-Aliasing 0 = Internal digital anti-aliasing filter is active.
0_B
Filter Control
1 = Internal digital anti- aliasing filter is by-passed.
2-0
Video Signal
Input Select
000 = NTSC/PAL 1
001 = NTSC/PAL 2
010 = NTSC/PAL 3
011 = S-video
100 = reserved
101 = reserved
110 = reserved
111 = reserved
000_B
TABLE 16. COLOR PROCESSING REGISTER
BIT
NO.
FUNCTION
SUB ADDRESS = 06_H
DESCRIPTION
RESET
STATE
7-6
Color Gain
Control Select
If a value of “10”, the color gain adjust register is used to specify the amount of color gain
01_B
to be applied.
00 = No gain control (gain = 1x)
01 = Automatic gain control
10 = Fixed gain control
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
Select
Coring may be used to reduce low-level noise around zero (code 128) in the CbCr signals.
00_B
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
1_B
Select
and CbCr 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 Lowpass
This bit selects the bandwidth of the CbCr data.
0_B
Filter Select
0 = 850kHz
1 = 1.5MHz
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