參數(shù)資料
型號(hào): VV6501C001
廠商: 意法半導(dǎo)體
英文描述: DUAL-MODE DIGITAL CAMERA CO-PROCESSOR
中文描述: 雙模式數(shù)字相機(jī)協(xié)處理器
文件頁(yè)數(shù): 20/44頁(yè)
文件大小: 351K
代理商: VV6501C001
STV0681 Hardware Interfaces
STV0681
20/44
ADCS 7283313C
4.2.3
SDRAM refresh period
The SDRAM refresh period from STV0681 is guaranteed to be inferior or equal to 15.6
μ
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.
4.2.4
SDRAM initialisation period
The SDRAM initialisation period is currently set to 981
μ
s
in STV0681.
Figure 5: SDRAM Write Timing (16Mbit device, burst write)
Table 3: Timing parameters for SDRAM read/write
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
DCLK
Command
DQM
A0-9,BA
A10
ACTIVE
WRITE
NOP
PRECHARGE
NOP
ROW
COLUMN
ROW
DIN M
DIN M + 1
DIN M + 2
DIN M + 3
DQ
t
CK
t
RCD
t
RC
CKE
t
RAS
t
RP
t
CMS
t
CMH
t
AS
t
AH
t
L
t
H
t
CMS
t
CMH
t
DS
t
DH
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