![](http://datasheet.mmic.net.cn/230000/IMST400_datasheet_15584548/IMST400_20.png)
IMS T400
/ 74
20
T400-20
Min
a
–8
b
–8
c
–5
–4
d
–3
e
–8
f
–6
c
–5
–4
f
–6
c
–5
–4
f
–6
c
–5
–4
Symbol
TaVS0L
TS0LaX
TS0LS0H
TS0LS1L
TS0LS1H
TS0HS1H
TS0LS2L
TS0LS2H
TS0HS2H
TS0LS3L
TS0LS3H
TS0HS3H
TS0LS4L
TS0LS4H
TS0HS4H
Tmx
n
Parameter
Address setup before
notMemS0
Address hold after
notMemS0
notMemS0
pulse width low
notMemS1
from
notMemS0
notMemS1
end from
notMemS0
notMemS1
end from
notMemS0
end
notMemS2
delayed after
notMemS0
notMemS2
end from
notMemS0
notMemS2
end from
notMemS0
end
notMemS3
delayed after
notMemS0
notMemS3
end from
notMemS0
notMemS3
end from
notMemS0
end
notMemS4
delayed after
notMemS0
notMemS4
end from
notMemS0
notMemS4
end from
notMemS0
end
Complete external memory cycle
Max
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Notes
1
2
3
b
+8
c
+6
4
d
+7
e
+4
f
+5
c
+7
7
f
+5
c
+7
7
f
+5
c
+7
7
1
5
9
2
6
4,6
5,6
7
3
10
3
7
11
4
8
12
7
3
7
3
8
Notes
1
a
is
T1
where
T1
can be from one to four periods
Tm
in length.
2
b
is
T2
where
T2
can be from one to four periods
Tm
in length.
3
c
is totalof
T2
+
T3
+
T4
+
Twait
+
T5
where
T2
,
T3
,
T4
,
T5
can be from oneto fourperiods
Tm
each
in length and
Twait
may be any number of periods
Tm
in length.
4
d
can be from zero to 31 periods
Tm
in length.
5
e
can be from –27 to +4 periods
Tm
in length.
6 If the configuration would cause the strobe to remain active past the end of
T6
it will go high at
the end of
T6
. If the strobe is configured to zero periods
Tm
it will remain high throughout the
complete cycle
Tmx
.
7
f
can be from zero to 31 periods
Tm
in length. If this length would cause the strobe to remain
active past the end of
T5
it will go high at the end of
T5
. If the strobe value is zero periods
Tm
it will remain low throughout
T1
to
T5
and only go high during the first
Tm
of
T6
.
8
Tmx
is
one
complete
external
memory
T1
+
T2
+
T3
+
T4
+
Twait
+
T5
+
T6
where
T1
,
T2
,
T3
,
T4
,
T5
can befrom oneto fourperiods
Tm
each
in length,
T6
can befrom one to five periods
Tm
inlength and
Twait
maybe zero or any number
of periods
Tm
in length.
Table 5.3
IMS T400 strobe timing
cycle
comprising
the
total
of