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參數(shù)資料
| 型號(hào)： | VV6500 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | DUAL-MODE DIGITAL CAMERA CHIPSET |
| 中文描述： | 雙模式數(shù)字相機(jī)芯片組 |
| 文件頁數(shù)： | 22/63頁 |
| 文件大?。?/td> | 563K |
| 代理商： | VV6500 |
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STV0680B hardware interfaces
STV0680B + VV6444/6410/6500
22/63
Version 3.4
Table 5 : Timing parameters for SDRAM read/write
4.3.3
SDRAM refresh period
The SDRAM refresh period from STV0680B is guaranteed to be no greater than 15.6
μ
S during
‘Snapshot’/self-timer/continuous/tethered video modes of operation (i.e. not standby mode). In
standby mode, the SDRAM is set to self-refresh, therefore no refresh from STV0680B takes place.
4.3.4
SDRAM initialisation period
The SDRAM initialisation period is currently set to 981
μ
S
in STV0680B.
4.4
USB interface
STV0680B includes a USB Version 1.1 compliant Universal Serial Bus Interface, including a
transceiver. This allows direct connection from STV0680B to a USB connector with minimal
additional hardware (i.e. a small number of passive discretes) - see
Chapter 6
The USB interface interfaces the STV0680B to the USB at full speed 12MHz data rate. Some of the
features are:
G
Compliant with USB protocol revision 1.1.
G
USB protocol handling.
G
USB device state handling.
G
Clock and data recovery from USB.
G
Bit stripping and bit stuffing functions.
G
CRC5 checking, CRC16 generation and checking.
G
Serial to parallel conversion.
G
Single bulk end point.
USB drivers are supplied by ST. For USB timing information, please refer to the USB specification
V1.1.
Symbol
Min.
Max
Units
Symbol
Min.
Max
Units
t
CK
166.45
166.89
ns
t
DS
81.01
ns
t
CH
t
CK
t
DH
83.41
ns
t
CL
t
CK
t
RCD
1
t
CK
t
AC
t
CK
t
RAS
5
5
t
CK
t
OH
0
ns
t
RC
7
t
CK
t
CMS
82.88
ns
t
RP
2
t
CK
t
CMH
82.85
ns
t
RCD
1
t
CK
t
AS
82.88
ns
t
AH
82.76
ns
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