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): 38/74頁
文件大?。?/td> 563K
代理商: IMST425J20S
IMS T400
/ 74
38
Refresh
interval
18
36
54
72
Interval
in s
3.6
7.2
10.8
14.4
Field 11
encoding
00
01
10
11
Complete
cycle (ms)
0.922
1.843
2.765
3.686
Table5.11
IMS T400 memory refresh configuration coding
Refresh intervals are in periods of
ClockIn
and
ClockIn
frequency is 5 MHz:
Interval = 18 * 200 = 3600 ns
Refresh interval is between successive incremental refresh addresses.
Complete cycles are shown for 256 row DRAMS.
T400-20
Min
25
0
388
Symbol
TMCVRdH
TRdHMCX
TS0LRdH
Parameter
Memory configuration data setup
Memory configuration data hold
notMemS0
to configuration data read
Max
Units
ns
ns
ns
412
Table5.12
Memory configuration
T1
T2
T3
T4
T5
T6
T1
Data
Address
Data
Data
Data
TRdHMCX
TMCVRdH
TS0LRdH
MemnotWrD0
MemnotRfD1
MemAD2–31
notMemS0
MemConfig
notMemRd
Tstate
Tm
Figure 5.21
IMS T400 external configuration read cycle timing
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