BT848 ETC, BT848 Datasheet - Page 132
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BT848
Manufacturer Part Number
BT848
Description
Single-Chip Video Capture for PCI
Manufacturer
ETC
Datasheet
1.BT848.pdf
(141 pages)
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C
Chroma (V) Gain Register, Lower Byte
Chroma (V) Gain Register, Lower Byte
Memory Mapped Location 0x038 – (SAT_V_LO)
This is the alternate definition for the SAT_V_LO register when using the Bt848A/849A.
digital video mode).
adjustments as in analog video decode operation.
122
Bits
[7:0]
ONTROL
Upon reset it is initialized to 0xB4 (this must be changed to 0x80 to get standard chroma (V) gain values when in
The SAT_V register when used in digital video input mode requires different programming to get the same V gain
R
EGISTER
Type
RW
D
SAT_V_LO
Default
0xB4
IGITAL
V
IDEO
Name
SAT_V_LO
I
N
Decimal Value
511
510
.
.
255
254
.
.
128
.
.
1
0
S
UPPORT
(B
T
848A/849A O
Description
This register is used to add a gain adjustment to the V component
of the video signal. By adjusting the U and V color components of
the video stream by the same amount, the saturation is adjusted.
L848A_A
Hex Value
0x1FF
0x1FE
.
.
0x0FF
0x0FE
.
.
0x080
.
.
0x001
0x000
NLY
)
Single-Chip Video Capture for PCI
% of Original Signal
399.22%
398.43%
.
.
199.22%
198.44%
.
.
100%
.
.
0.78%
0.00%
Bt848/848A/849A
Brooktree
®
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