STV-6411C-D01 STMICROELECTRONICS [STMicroelectronics], STV-6411C-D01 Datasheet - Page 20

• Manufacturer Part Number: STV-6411C-D01
• Description: DUAL-MODE DIGITAL CAMERA CO-PROCESSOR
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STV0681 Hardware Interfaces
4.2.3
4.2.4
20/44
Command
A0-9,BA
A10
DQM
DQ
DCLK
CKE
t
t
t
t
t
t
t
t
Symbol
CK
CH
CL
AC
OH
CMS
CMH
AS
SDRAM refresh period
The SDRAM refresh period from STV0681 is guaranteed to be inferior or equal to 15.6 s during
‘Snapshot’/self-timer/continuous/tethered video modes of operation (that is not standby mode). In
standby mode, the SDRAM is set to self-refresh, therefore no refresh from STV0681 takes place.
SDRAM initialisation period
The SDRAM initialisation period is currently set to 981 s in STV0681.
t
t
t
CK
CMS
AS
166.45
ACTIVE
ROW
ROW
82.88
82.85
82.88
Min.
½
½
0
t
CMH
t
AH
Figure 5: SDRAM Write Timing (16Mbit device, burst write)
t
RCD
t
CMS
t
166.89
L
Table 3: Timing parameters for SDRAM read/write
DIN M
Max
WRITE
½
t
H
Units
DIN M + 1
t
t
t
ns
ns
ns
ns
ns
CK
CK
CK
ADCS 7283313C
t
RAS
t
DS
DIN M + 2
COLUMN
NOP
t
DH
Symbol
t
RC
t
t
t
t
t
RCD
RAS
t
t
RCD
t
DS
DH
RC
RP
AH
DIN M + 3
t
CMH
81.01
83.41
82.76
Min.
PRECHARGE
1
5
7
2
1
Max
5
NOP
t
RP
Units
t
t
t
t
t
ns
ns
ns
CK
CK
CK
CK
CK
STV0681