參數(shù)資料
型號: BT849A
英文描述: Single-Chip Video Capture for PCI
中文描述: 單芯片的PCI視頻捕捉
文件頁數(shù): 131/141頁
文件大?。?/td> 1149K
代理商: BT849A
Brooktree
121
C
ONTROL
R
EGISTER
D
IGITAL
V
IDEO
I
N
S
UPPORT
(B
T
848A/849A O
NLY
)
Luma Gain Register, Lower Byte
L848A_A
Bt848/848A/849A
Single-Chip Video Capture for PCI
Luma Gain Register, Lower Byte
Memory Mapped Location 0x030 – (CONTRAST_LO)
This is the alternate definition for the CONTRAST_LO register when using the Bt848A/849A.
Upon reset it is initialized to 0xD8 (this must be changed to 0x80 to get standard contrast values when in digital
video mode).
The CONTRAST register when used in digital video input mode, requires different programming time contrast ad-
justments as in analog video decode operation.
CONTRAST_LO
The least significant byte of the luma gain (contrast) value.
NOTE:
The BRIGHT function has the same register definition in the digital sec-
tion as in the analog section. However, the Bright function does precede
the CONTRAST function in the decoder signal processing sequence,
therefore any brightness applied is also gained by the CONTRAST set-
ting.
Bits
Type
Default
Name
Description
[7:0]
RW
0xD8
CONTRAST_LO
The CON_L_MSB bit and the CONTRAST_LO register concate-
nate to form the 9-bit CONTRAST register. The value in this regis-
ter is multiplied by the luminance value to provide contrast
adjustment.
Decimal Value
Hex Value
% of Original Signal
511
0x1FF
399.22%
510
0x1FE
398.43%
.
.
.
.
.
.
217
0x0D9
169.53%
216
0x0D8
168.75%
.
.
.
.
.
.
128
0x080
100%
.
.
.
.
.
.
1
0x001
0.78%
0
0x000
0.00%
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