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): 58/141頁
文件大?。?/td> 1149K
代理商: BT849A
Bt848/848A/849A
Single-Chip Video Capture for PCI
Brooktree
48
F
UNCTIONAL
D
ESCRIPTION
DMA Controller
L848A_A
Target Memory
The Bt848’s FIFO DWORDs are perfectly aligned to the PCI bus, i.e. bit 0 of the
FIFO DWORDs lines up with bit AD[0] on the PCI bus. Thus, video scan line data
is aligned to target memory locations, and data path combinational logic between
the FIFO and the PCI bus is not required.
The target memory for a given scan line of data is assumed to be linear, incre-
menting, and contiguous. For a 1024-pixel scan line a maximum of 4 KB of con-
tiguous physical memory is required. Each scan line can be stored anywhere in the
32-bit address space. A scan line can be broken into segments with each segment
sent to a different target area. An image buffer can be allocated to line fragments
anywhere in the physical memory, as the line sequence is arbitrary.
Figure 23. RISC Block Diagram
RISC
Instruction
Buffer
DMA
Address
and
Byte Counter
FIFO Data
Buffer
RISC
Program
Counter
Address/Data
Decoder
RISC
Decoder
PCI
Initiator
Control Signals
Op
Code
To PCI Bus
Interface
Pixel Data [31:0]
Address
RISC
Instructions
FIFO Read
Signals
FIFO Status
Bits
Number of
Bytes
Available
in FIFO
FIFO
Output [31:0]
From
FIFO
DMA Controller
RISC Program
Start Address
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