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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(yè)數(shù)： | 65/141頁(yè) |
| 文件大?。?/td> | 1149K |
| 代理商： | BT849A |
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Brooktree
55
F
UNCTIONAL
D
ESCRIPTION
DMA Controller
L848A_A
Bt848/848A/849A
Single-Chip Video Capture for PCI
Complex Clipping
It is necessary to be able to clip the video image before it is put onto the PCI bus
when writing video data directly into on-screen display memory. The Bt848 sup-
ports complex clipping of the video image for those applications which require the
displayed video picture to be occluded by graphics objects such as pull-down
menu, overlaying graphics window, etc. Typically, a target graphics frame buffer
controller cannot provide overlay control for the video pixel data stream when it
being provided by a PCI bus master peripheral to the graphics PCI host interface.
The Bt848 implements clipping by blocking the video image as it is being put
onto the PCI bus in the areas where graphics are to be displayed, that is, where
graphics objects are “overlaying” the video image. The Bt848 cuts out portions of
the video image so that it can “inlay” or fit around the displayed graphics objects.
A clip list is provided through the graphics system DirectDRAW Interface
(DDI) provider to the Bt848 device driver software to indicate the areas of the dis-
play where the video image is to be occluded. The Bt848 driver software interprets
the clip list and generates a RISC program that blocks writing of video pixels that
are to be occluded. This is illustrated in Figure 24.
Figure 24. Example of Bt848 Performing Complex Clipping
System DRAM
Y
Cr
Cb
Write #Bytes @ Line 0
...
Write #B @ L40, Skip #B, Wr #B @ L40
...
SYNC VRO
Write123 #B @ Y, #B @ Cr, #B @ Cb
...
SYNC VRE
JUMP
Odd Field Prog
Packed RGB
Even Field Prog
Planar 4:2:2
CPU
Host
Bridge
Frame Buffer
Video in a Window
Dialog
Box
Graphics Controller
Bt848
PCI Bus
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BT849AKPF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Chip Video Capture for PCI |
| BT850-SA | 功能描述:BTV4.2 DUAL MODE USB HCI MODULE 制造商:laird - wireless & thermal systems 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:1 |
| BT850-SA-T/R | 功能描述:BTV4.2 DUAL MODE USB HCI MODULE 制造商:laird - wireless & thermal systems 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:2,500 |
| BT850-ST | 功能描述:BTV4.2 DUAL MODE USB HCI MODULE 制造商:laird - wireless & thermal systems 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:1 |
| BT850-ST-T/R | 功能描述:BTV4.2 DUAL MODE USB HCI MODULEE 制造商:laird - wireless & thermal systems 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:2,500 |
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