參數(shù)資料
型號(hào)： W9968CF
英文描述： Digital Camera
中文描述： 數(shù)碼相機(jī)
文件頁(yè)數(shù)： 3/78頁(yè)
文件大?。?/td> 814K
代理商： W9968CF
W9968CF
Publication Release Date: May 1999
Revision A2
- 3 -
TABLE OF CONTENTS
1 GENERAL DESCRIPTION
..............................................................................................................7
2 FEATURES
.......................................................................................................................................8
3 PIN CONFIGURATION
..................................................................................................................10
4 PIN DESCRIPTION
........................................................................................................................11
4.1 P
IN
D
EFINITION
..................................................................................................................................11
4.2 P
IN
L
IST
.............................................................................................................................................16
4.3 P
OWER
-
ON
R
ESET
I
NITIALIZATION
.....................................................................................................17
5 SYSTEM DIAGRAM
.......................................................................................................................18
6 BLOCK DIAGRAM
.........................................................................................................................19
7 FUNCTIONAL DESCRIPTION
......................................................................................................20
7.1 V
IDEO
I
NPUT
I
NTERFACE
....................................................................................................................20
7.1.1 Camera Control Serial Bus
......................................................................................................20
7.1.2 Input Video Data Format
..........................................................................................................20
7.1.3 Cropping
....................................................................................................................................21
7.1.4 Scaling
.......................................................................................................................................21
7.1.5 Filtering
......................................................................................................................................22
7.1.6 Captured Video Data Format
...................................................................................................22
7.2 DRAM C
ONTROL AND
I
NTERFACE
.....................................................................................................23
7.2.1 DRAM Access Arbitration
........................................................................................................23
7.2.2 DRAM Interface
........................................................................................................................23
7.3 JPEG C
OMPRESSION
........................................................................................................................25
7.3.1 Level Shift and Forward DCT
..................................................................................................25
7.3.2 Quantization
..............................................................................................................................25
7.3.3 Huffman Encoding
....................................................................................................................26
7.3.4 JPEG Encoding Order
..............................................................................................................26
7.4 USB I
NTERFACE AND
D
EVICE
C
ONTROL
............................................................................................27
7.4.1 Endpoints
.....................................................................................................................................27
7.4.1.1 Default Endpoint (Endpoint 0)
............................................................................................................27
7.4.1.2 Video Data-In Endpoint (Endpoint 1)
.................................................................................................27
7.4.2 USB Device Requests
..............................................................................................................27
7.4.2.1 Standard Device Requests
................................................................................................................27
7.4.2.2 Video Camera Class-Specific Requests
...........................................................................................29
7.4.2.3 Vendor-Specific Requests
.................................................................................................................29
7.4.3 Descriptors
................................................................................................................................30
7.4.3.1 Device Descriptors
.............................................................................................................................30
7.4.3.2 Configuration Descriptors
..................................................................................................................31
7.4.3.3 String Descriptors
...............................................................................................................................33
7.5 V
IDEO
/S
TILL
I
MAGE
D
ATA
T
RANSFER
.................................................................................................34
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