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參數資料
| 型號： | W9967CF |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 消費家電 |
| 英文描述： | JPEG USB Camera Chip(運用JPEG壓縮技術和通用串行總線結構技術的照相電路數字處理芯片的攝像照相機接口控制器) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP128 |
| 封裝： | 14 X 20 MM, 2.75 MM HEIGHT, QFP-128 |
| 文件頁數： | 34/74頁 |
| 文件大小： | 762K |
| 代理商： | W9967CF |
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W9967CF
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7.5 Video/Still Image Data Transfer
Video or still image data from the device is delivered to the host system through an isochronous pipe
(Endpoint 1). The maximum packet size can be varied for different alternate settings for limited USB
bandwidth for other USB devices.
7.5.1 Output Video Data Format
The W9967CF supports two video transfer modes: original video transfer mode and JPEG
compression video transfer mode. The captured video stored in the DRAM will be compressed by the
JPEG encoder and then transferred to the host if JPEG compression video transfer mode is selected,
or will be directly transferred to the host if original video transfer mode is selected. Four different
formats are supported for the output video which are selected by bits 1-0 of the Video Capture Control
register (CR26) and bits 1 of the JPEG Encoder Control register (CR39) as described in Table 7.13.
Table 7.13 Output Video Data Format
CR39_1
CR26_1-0
Output Video Data Format
0
00
Original YUV4:2:2 packed mode
0
01
Original YUV4:2:0 packed mode
1
0X
Reserved
1
10
JPEG YUV4:2:2 non-interleaved scan mode
1
11
JPEG YUV4:2:0 non-interleaved scan mode
7.5.2 Video Frame Synchronization
A single video frame typically requires multiple USB packets. One or more zero length isochronous
data packets are used to mark the end of a video frame. The first non-zero data packet is the start of
the next video frame.
f an error is encountered during the reception of a USB packet, the host may discard the entire video
frame. Processing begins again with the next video frame as indicated by the first non-zero length
isochronous data packet after one or more zero-length packet.
7.5.3 Bandwidth Management
The W9967CF provides for varying the bandwidth required by providing a zero-bandwidth interface
(alternate setting zero) and 16 alternate settings interfaces with 8 Mbps down to 0.5 Mbps bandwidth
in descending 0.5 Mbps steps. The default alternate setting zero (with zero bandwidth) selected by a
Set Configuration request allows a video camera to be initially configured even on a highly utilized
USB bus. Before the device begins streaming video data, the host software must select an alternate
setting with the appropriate amount of bandwidth by using the Set Interface request.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| W99681CF | 制造商:WINBOND 制造商全稱:Winbond 功能描述:JPEG USB Dual Mode Camera Chip |
| W99685 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| W99685BS | 制造商:WINBOND 制造商全稱:Winbond 功能描述:SYSTEM CAMERA DEVICE |
| W99685FS | 制造商:WINBOND 制造商全稱:Winbond 功能描述:SYSTEM CAMERA DEVICE |
| W9968CF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Camera |
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