STV0680 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STV0680 Datasheet PDF : 63 Pages
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STV0680B hardware interfaces
STV0680B + VV6444/6410/6500
Symbol Min.
tCK
tCH
tCL
tAC
tOH
tCMS
tCMH
tAS
166.45
½
½
0
82.88
82.85
82.88
Max
166.89
½
Units
ns
tCK
tCK
tCK
ns
ns
ns
ns
Symbol Min.
tDS
tDH
tRCD
tRAS
tRC
tRP
tRCD
tAH
81.01
83.41
1
5
7
2
1
82.76
Max
5
Units
ns
ns
tCK
tCK
tCK
tCK
tCK
ns
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 15.6µS 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 981µS 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.
22/63
Version 3.4
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