BT848 ETC, BT848 Datasheet - Page 107
BT848
Manufacturer Part Number
BT848
Description
Single-Chip Video Capture for PCI
Manufacturer
ETC
Datasheet
1.BT848.pdf
(141 pages)
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Bt848/848A/849A
Single-Chip Video Capture for PCI
Miscellaneous Control Register
Memory Mapped Location 0x02C – Even Field (E_CONTROL)
Memory Mapped Location 0x0AC – Odd Field (O_CONTROL)
Upon reset it is initialized to 0x20. SAT_V_MSB is the least significant bit.
Brooktree
Bits
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
Type
®
RW
RW
RW
RW
RW
RW
RW
RW
Default
0
0
1
0
0
0
0
0
Name
LNOTCH
COMP
LDEC
CBSENSE
Reserved
CON_MSB
SAT_U_MSB
SAT_V_MSB
L848A_A
Description
This bit is used to include the luma notch filter. For monochrome
video, the notch filter should not be used. This will output full band-
width luminance.
When COMP is set to logical one, the luma notch is disabled.
When COMP is set to logical zero, the C ADC is disabled.
The luma decimation filter is used to reduce the high-frequency
component of the luma signal. Useful when scaling to CIF resolu-
tions or lower.
This bit controls whether the first pixel of a line is a Cb pixel or a Cr
pixel. For example, if CBSENSE is low and HDELAY is an even
number, the first active pixel output is a Cb pixel. If HDELAY is odd,
CBSENSE may be programmed high to produce a Cb pixel as the
first active pixel output.
This bit should only be written with a logical zero.
The most significant bit of the luma gain (contrast) value.
The most significant bit of the chroma (u) gain value.
The most significant bit of the chroma (v) gain value.
0
1
0
1
0
1
0
1
= Enable the luma notch filter
= Disable the luma notch filter
= Composite Video
= Y/C Component Video
= Enable luma decimation using selectable H filter
= Disable luma decimation
= Normal Cb, Cr order
= Invert Cb, Cr order
C
ONTROL
Miscellaneous Control Register
R
EGISTER
D
EFINITIONS
97
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