HMP8112 Datasheet, PDF (14/40 Pages) Harris Corporation – NTSC/PAL Video Decoder

HMP8112
TABLE 6. VIDEO INPUT CONTROL
BIT
NUMBER
FUNCTION
DESTINATION ADDRESS = 00_H
DESCRIPTION
RESET
STATE
7 - 6 Video Input
These bits select the video input standard.
11_B
Standard
00 = PAL B, G, H, I, N; 4.43MHz subcarrier; 50fps; 625 lines/frame;
01 = PAL M; 3.58MHz subcarrier; 60fps; 525 lines/frame;
10 = Special PAL N; 3.58MHz subcarrier; 50fps; 625 lines/frame;
11 = NTSC M; 3.58MHz subcarrier; 60fps; 525 lines/frame (default);
5
Color Trap Filter This bit enables the color subcarrier trap filter. The filter removes the color subcarrier infor-
1_B
Disable
mation from the luminance channel. The filter should be enabled for PAL Standard systems.
0 = Enabled
1 = Disabled (default)
4
Chrominance Low This bit enables the chrominance low pass filter. This filter band limits the chrominance
1_B
Pass Filter Disable channel to remove luminance artifacts. This filter should be enabled for PAL Standard
systems.
0 = Enabled
1 = Disabled (default)
3
Automatic Color
This bit enables the color AGC function. When this bit is set the color AGC will automati-
1_B
Gain Control
cally adjust the chrominance channel gain, to drive the color reference burst to a nominal
±20 IRE’s. When this bit is cleared the color AGC gain factor is set to 1.0 and the color
saturation must be adjusted to obtain nominal CrCb values.
0 = Disabled
1 = Enabled (default)
2 - 1 A/D Converter
These bits control the A/D input select multiplexers and whether S-Video is being input as
00_B
Multiplexor Selects follows: MUXSEL1,0 =
0, 0 = Select Composite Video Input #0, set decoder for Composite
1, 0 = Select Composite Video Input #1, set decoder for Composite
0, 1 = Select Composite Video Input #2, set decoder for Composite
1, 1 = Select S-Video Y and C Inputs
0
Not Used
Write Ignored, Read 0’s
X_B
TABLE 7. LUMINANCE BRIGHTNESS CONTROL
BIT
NUMBER
FUNCTION
DESTINATION ADDRESS = 01_H
DESCRIPTION
RESET
STATE
7
IRE Setup
This bit enables the black setup cancelation circuit for NTSC sources. When this bit is set
1_B
Cancellation Control a value of 73 is used to strip the sync information from the video signal. When this bit is
cleared a value of 64 is used to strip the sync information.
0 = subtract 64 from the luminance signal
1 = subtract 73 from the luminance signal
6-0
Luminance
Brightness Control
These bits control the brightness adjustment to the luminance channel. The brightness
adjustment value is a number that ranges from +63 to -64. This register is in the two’s
complement format, where bit 6 is the sign bit.
000 0000_B
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