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): 103/141頁
文件大?。?/td> 1149K
代理商: BT849A
Brooktree
93
C
ONTROL
R
EGISTER
D
EFINITIONS
Temporal Decimation Register
L848A_A
Bt848/848A/849A
Single-Chip Video Capture for PCI
Temporal Decimation Register
Memory Mapped Location 0x008 – (TDEC)
Upon reset it is initialized to 0x00. DEC_RAT(0) is the least significant bit. This register enables temporal decimation
by discarding a finite number of fields or frames from the incoming video.
MSB Cropping Register
Memory Mapped Location 0x00C – Even Field (E_CROP)
Memory Mapped Location 0x08C – Odd Field (O_CROP)
Upon reset it is initialized to 0x12. HACTIVE_MSB(0) is the least significant bit. See the VACTIVE, VDELAY,
HACTIVE and HDELAY registers for descriptions on the operation of this register.
Bits
Type
Default
Name
Description
[7]
RW
0
DEC_FIELD
Defines whether decimation is by fields or frames.
0
= Decimate frames.
1
= Decimate fields.
[6]
RW
0
FLDALIGN
This bit aligns the start of decimation with an even or odd field.
0
= Start decimation on the odd field (an odd field is the first
field dropped).
1
= Start decimation on the even field (an even field is the
first field dropped).
[5:0]
RW
000000
DEC_RAT
DEC_RAT is the number of fields or frames dropped out of 60
(NTSC) or 50 (PAL/SECAM) fields or frames. 0x00 value disables
decimation (all video frames and fields are output).
Bits
Type
Default
Name
Description
[7:6]
RW
00
VDELAY_MSB
(1)
The most significant two bits of vertical delay register.
[5:4]
RW
01
VACTIVE_MSB
The most significant two bits of vertical active register.
[3:2]
RW
00
HDELAY_MSB
The most significant two bits of horizontal delay register.
[1:0]
RW
10
HACTIVE_MSB
The most significant two bits of horizontal active register.
Notes: (1). For VDELAY_MSB the E_CROP and O_CROP address pointer is flipped. To write to the even field,
VDELAY_MSB bits use the odd field address. To write to the odd field, VDELAY_MSB bits use the even field
address.
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