參數(shù)資料
型號(hào): 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): 53/141頁
文件大?。?/td> 1149K
代理商: BT849A
Brooktree
43
F
UNCTIONAL
D
ESCRIPTION
Video and Control Data FIFO
L848A_A
Bt848/848A/849A
Single-Chip Video Capture for PCI
Video and Control Data FIFO
The FIFO block accepts data from the video data format conversion process, buff-
ers the data in FIFO memory, then outputs DWORDs to the DMA Controller to be
burst onto the PCI bus.
Logical Organization
The 630-byte data FIFO is logically organized into 3 segments: FIFO1 = 70 words
deep by 36 bits wide, FIFO2 = 35 x 36 bits, and FIFO3 = 35 x 36 bits. Each of the
140 FIFO data words provide for one DWORD of pixel data and four bits of video
control code status. This is illustrated in Figure 22. The FIFOs are large enough to
support efficient size burst transfers (16 to 32 data phases) in planar as well as
packed mode.
Figure 22. Data FIFO Block Diagram
FIFO1
70x36
FIFO2
35x36
FIFO3
35x36
Y
Cr
Cb
FIFO Write Signals
(From VDFC)
FIFO Enable Signal
(From Control
FIFO Write Clock
(Synchronous to
Video Decoder
Pixel Clock)
FIFO1
Output
FIFO2
Output
FIFO3
Output
FIFO Read Signals
(From DMA Controller)
FIFO Read Clock
(Synchronous to
PCI Clock)
From FIFO Input Data Formatter
FI[35:32]
Control Status Code
FI[31:0]
Pixel Data
3
3
Register)
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