參數(shù)資料
型號: IMST425J20S
英文描述: Peripheral IC
中文描述: 外圍芯片
文件頁數(shù): 27/74頁
文件大?。?/td> 563K
代理商: IMST425J20S
5 External memory interface
/ 74
27
T400-20
Min
a
–2
b
–12
b
–4
Symbol
Parameter
Max
a
+9
Units
ns
ns
ns
Notes
1
TRfLRfH
TRaVS0L
TRfLS0L
Refresh pulse width low
Refresh address setup before
notMemS0
Refresh indicator setup before
notMemS0
b
+6
2
Notes
1
a
is total
Tmx
+
Tm
.
2
b
is total
T1
+
Tm
where
T1
can be from one to four periods
Tm
in length.
Table 5.7
Memory refresh
T4
T5
T6
T1
T2
T3
T4
T5
T6
T1
Tstate
normal cycle
MemAD2–31
Address
Data
T6
R
R
T1
T2
T3
T4
T5
T6
T1
Tstate
MemAD2–11
Refresh address
notMemS0
notMemRf
MemnotWrD0
MemnotRfD1
MemAD12–30
MemAD31
TRaVSOL
TRfLSOL
TRfLRfH
Figure 5.11
IMS T400 refresh cycle timing
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