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Table 25.7
Bus Timing (Conditions: V
CC
= 5.0 V ± 10%, AV
CC
= 5.0 V ± 10%, AV
CC
= V
CC
±
10%, AV
ref
= 4.5 V to AV
CC
, V
SS
= AV
SS
= 0 V, Ta = – 20 to +75
°
C)
Item
Symbol
Min
Max
Unit Figure
Write address setup time
t
AS
0
—
ns
25.8–25.9
Write address hold time
t
WR
5
—
ns
25.8, 25.9, 25.19
Write data hold time
t
WRH
0
—
ns
Read/write strobe delay time 1 t
RWD1
2
*
3
18
ns
25.11–25.16
Read/write strobe delay time 2 t
RWD2
2
*
3
18
ns
High-speed page mode CAS
precharge time
t
CP
t
cyc
– 25
—
ns
25.16
RAS precharge time
t
RP
t
cyc
×
(TPC
+
1.5) – 15 —
ns
25.11–25.16
CAS setup time
t
CSR
10
—
ns
25.17, 25.18
AH delay time 1
t
AHD1
2
*
3
18
ns
25.19
AH delay time 2
t
AHD2
2
*
3
18
ns
Multiplex address delay time
t
MAD
2
*
3
18
ns
Multiplex address hold time
t
MAH
0
—
ns
DACK delay time
t
DACKD1
2
*
3
21
ns
25.8, 25.9, 25.11–
25.16, 25.19
Notes: n is the number of waits. m is 0 when the number of DRAM write cycle waits is 0, and 1
otherwise. RCD is the set value of the RCD bit in DCR. TPC is the set value of the TPC bit
in DCR.
*
1 If the access time is satisfied, t
RDS
need not be satisfied.
*
2 t
WDH
(max) is a reference value.
*
3 The delay time Min values are reference values (typ).
*
4 t
RDS
is a reference value.
*
5 When 28.7MHz, tASR=0ns (min)
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