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| 型號： | IMST425J17S |
| 英文描述： | Peripheral IC |
| 中文描述： | 外圍芯片 |
| 文件頁數(shù)： | 17/74頁 |
| 文件大?。?/td> | 563K |
| 代理商： | IMST425J17S |
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5 External memory interface
/ 74
17
The time value
Tm
is used to define the duration of
Tstates
and, hence, the length of external memory
cycles;itsvalueis exactlyhalftheperiodofone
ProcClockOut
cycle (0.5*
TPCLPCL
),regardlessofmark/
space ratio of
ProcClockOut
.
Edges of the various external memory strobes coincide with rising or falling edges of
ProcClockOut
. It
should be noted, however, that there is a skew associated with each coincidence. The value of skew de-
pends on whether coincidence occurs when the
ProcClockOut
edge and strobe edge are both rising,
when both are fallingor ifeither isrising when theother is falling. Timingvalues given inthe strobe tables
show the bestand worst cases. If a more accurate timing relationship is required, the exact
Tstate
timing
andstrobe edgeto
ProcClockOut
relationshipsshould becalculatedandthecorrectskewfactorsapplied
from the edge skew timing table 5.4.
T400-20
Min
48
13.5
Symbol
Parameter
Max
52
28.5
Units
ns
ns
ns
ns
%
Notes
TPCLPCL
TPCHPCL
TPCLPCH
Tm
TPCstab
ProcClockOut
period
ProcClockOut
pulse width high
ProcClockOut
pulse width low
ProcClockOut
half cycle
ProcClockOut
stability
a
2,3
24
26
8
1
Notes
1 Stability is the variation of cycle periods between two consecutive cycles, measured at corre-
sponding points on the cycles.
2
a
is TPCLPCL – TPCHPCL.
3 This is a nominal value.
Table 5.1
ProcClockOut
1.5V
TPCLPCH
TPCHPCL
TPCLPCL
Figure 5.3
IMS T400
ProcClockOut
timing
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| IMST425-J17S | 32-Bit Microprocessor |
| IMST425J20S | Peripheral IC |
| IMST425-J20S | 32-Bit Microprocessor |
| IMST425-J25S | 32-Bit Microprocessor |
| IMST425-X25S | 32-Bit Microprocessor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IMST425-J17S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
| IMST425J20S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral IC |
| IMST425-J20S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
| IMST425-J25S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
| IMST425-X25S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
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