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參數資料
| 型號： | W99681CF |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | JPEG USB Dual Mode Camera Chip(運用JPEG壓縮技術、通用串行總線結構技術、雙制式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： | JPEG格式相機的USB雙模芯片（運用的JPEG壓縮技術，通用串行總線結構技術，雙制式的照相電路數字處理芯片的攝像照相機接口控制器） |
| 文件頁數： | 37/78頁 |
| 文件大小： | 816K |
| 代理商： | W99681CF |
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W99681CF
Publication Release Date: March 2000
- 37 - Revision A1
7.7 Serial EEPROM Interface
The W99681CF supports an external 1K (128
×
8) serial E
2
PROM as an optional source for IHV-specific
Vendor ID and Product ID. The external E
2
PROM data, in stead of the default data, will be used when a
high is sampled at SDA pin (pin 49) during a reset operation.
7.7.1 EEPROM Data Structure
The E
2
PROM contains IHV-specific Vendor ID and Product ID as described in Table 7.14.
Table 7.14 EEPROM Data Structure
Address
Field
Size
Value
Description
0x00
2
TL
Total length of E
2
PROM data to be returned
0x02
idVendor
2
Vendor ID
0x04
idProduct
2
Product ID
7.7.2 EEPROM Operations
The external E
2
PROM will be only read right after a reset operation. TL (defined in address 0x00) bytes
of data will be read by using a sequential read operation.
START condition:
A high-to-low transition of SDA with SCL high is a start condition which must
proceed any other command.
STOP condition:
A low-to-high transition of SDA with SCL high is a stop condition which terminates all
communications. After a read sequence, the stop command will place the E
2
PROM in a standby power
mode.
ACKNOWLEDGE:
All addresses and data words are serially transmitted to and from the E
2
PROM in
8-bit words. The E
2
PROM will acknowledge by pulling SDA low after receiving each address. The
W99681CF will likewise acknowledge by pulling SDA low after receiving each data word. This must
happen during the ninth clock cycle after each word received and after all other devices have freed the
SDA bus.
Refer to Figure 7.4, a sequential read is initiated by the W99681CF with a start condition followed by a
7-bit data word address (always 0) and a high read bit. The E
2
PROM will respond with an acknowledge
and then serially output 8 data bits. After the W99681CF receives an 8-bit data word, it responds with
an acknowledge. As long as the E
2
PROM receives an acknowledge, it will continue to increment the
data word address and serially clock out sequential data words. The sequential read operation is
terminated when the memory address limit (TL) is reached and the W99681CF does not respond with
an acknowledge but does generate a following stop condition.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
| W9986D | 制造商:WINBOND 制造商全稱:Winbond 功能描述:MPEG Audio Layer III Decoder |
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