HMP8115 Intersil Corporation, HMP8115 Datasheet - Page 26

• Manufacturer Part Number: HMP8115
• Description: Ntsc/pal Video Decoder
• Manufacturer: Intersil Corporation

NO.
NO.
BIT
BIT
7-6
5-4
3-2
7-6
5-4
3-2
1-0
1
0
Color Gain
Control Select
Color Killer
Select
Color Coring
Select
Contrast Control
Select
Color Lowpass
Filter Select
Y Filtering
Select
Black Level Y
Coring Select
High Frequency Y
Coring Select
Sharpness
Frequency Select
FUNCTION
FUNCTION
If a value of “10”, the color gain adjust register is used to specify the amount of color gain
to be applied.
00 = No gain control (gain = 1x)
01 = Automatic gain control
10 = Fixed gain control
11 = Freeze automatic gain control
00 = Force color on
01 = Enable color killer
10 = reserved
11 = Force color off
Coring may be used to reduce low-level noise around zero (code 128) in the CbCr sig-
nals.
00 = No coring
01 = 1 code coring
10 = 2 code coring
11 = 3 code coring
This bit specifies whether the contrast control affects just the Y data (“0”) or both the Y
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
This bit selects the bandwidth of the CbCr data.
0 = 850kHz
1 = 1.5MHz
The chroma trap filter may be used to remove any residual color subcarrier information
from the Y channel. During S-video operation, it should be disabled. During PAL opera-
tion, it should be enabled. The 3MHz lowpass filter may be used to remove high-frequen-
cy noise.
00 = No filtering
01 = Enable chroma trap filter
10 = Enable 3.0MHz lowpass filter
11 = reserved
Coring may be used to reduce low-level noise around black in the Y signal.
00 = No coring
01 = 1 code coring
10 = 2 code coring
11 = 3 code coring
Coring may be used to reduce high-frequency low-level noise in the Y signal.
00 = No coring
01 = 1 code coring
10 = 2 code coring
11 = 3 code coring
If a value of “01” or “10”, the sharpness adjust register is used to specify the amount of
sharpness to be applied.
00 = Bypass sharpness control
01 = Maximum gain at 2.6MHz
10 = Maximum gain at color subcarrier frequency
11 = reserved
TABLE 16. COLOR PROCESSING REGISTER
TABLE 17. LUMA PROCESSING REGISTER
SUB ADDRESS = 06
SUB ADDRESS = 08
HMP8115
26
DESCRIPTION
DESCRIPTION
H
H
RESET
RESET
STATE
STATE
01
01
00
00
00
01
00
1
0
B
B
B
B
B
B
B
B
B