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STV0680 bảng dữ liệu(PDF) 22 Page - STMicroelectronics

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STV0680 bảng dữ liệu(HTML) 22 Page - STMicroelectronics

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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
µS 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
µS 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:
q
Compliant with USB protocol revision 1.1.
q
USB protocol handling.
q
USB device state handling.
q
Clock and data recovery from USB.
q
Bit stripping and bit stuffing functions.
q
CRC5 checking, CRC16 generation and checking.
q
Serial to parallel conversion.
q
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
tCK
166.45
166.89
ns
tDS
81.01
ns
tCH
½
tCK
tDH
83.41
ns
tCL
½
tCK
tRCD
1
tCK
tAC
½
tCK
tRAS
55
tCK
tOH
0ns
tRC
7
tCK
tCMS
82.88
ns
tRP
2
tCK
tCMH
82.85
ns
tRCD
1
tCK
tAS
82.88
ns
tAH
82.76
ns



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