參數(shù)資料
型號: BT848A
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): 112/141頁
文件大?。?/td> 1149K
代理商: BT848A
Bt848/848A/849A
Single-Chip Video Capture for PCI
Brooktree
102
C
ONTROL
R
EGISTER
D
EFINITIONS
SC Loop Control Register
L848A_A
SC Loop Control Register
Memory Mapped Location 0x040 – Even Field (E_SCLOOP)
Memory Mapped Location 0x0C0 – Odd Field (O_SCLOOP)
Upon reset it is initialized to 0x00. Reserved(0) is the least significant bit.
Bits
Type
Default
Name
Description
[7]
RW
0
Reserved
Reserved for future use. Must be written with a zero.
PEAK
This bit determines if the normal luma low pass filters are imple-
mented via the HFILT bits or if the peaking filters are implemented.
0
= Normal luma low pass filtering
1
= Use luma peaking filters
[6]
RW
0
CAGC
This bit controls the Chroma AGC function. When enabled,
Chroma AGC will compensate for non-standard chroma levels.
The compensation is achieved by multiplying the incoming chroma
signal by a value in the range of 0.5 to 2.0.
0
= Chroma AGC Disabled
1
= Chroma AGC Enabled
[5]
RW
0
CKILL
This bit determines whether the low color detector and removal cir-
cuitry is enabled.
0
= Low Color Detection and Removal Disabled
1
= Low Color Detection and Removal Enabled
[4:3]
RW
00
HFILT
These bits control the configuration of the optional 6-tap Horizontal
Low-Pass Filter. The auto-format mode determines the appropriate
low-pass filter based on the horizontal scaling ratio selected. The
LDEC bit in the CONTROL register must be programmed to zero
to use these filters.
00*
= Auto Format. If auto format is selected when horizontally
scaling between full resolution and half resolution, no fil-
tering is selected. When scaling between one-half and
one-quarter resolution, the CIF filter is used. When scal-
ing between one-quarter and one-eighth resolution, the
QCIF filter is used, and at less than one-eight resolution,
the ICON filter is used.
01
= CIF
10
= QCIF
11
= ICON
HFILT
If the PEAK bit is set to logical one, the HFILT bits determine which
peaking filter is selected.
01
= Minimum peaking
10
= Medium peaking
11
= Maximum peaking
[2:0]
RW
00
Reserved
These bits must be set to zero.
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