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Table 6.2
Bus Specifications for Each Area (Basic Bus Interface)
ABWCR
ASTCR
WTCRA, WTCRB
Bus Specifications (Basic Bus Interface)
ABWn
ASTn
Wn2
Wn1
Wn0
Bus Width
Access
States
Program Wait
States
0
0
—
—
—
16
2
0
1
0
0
0
3
0
1
1
1
0
2
1
3
1
0
0
4
1
5
1
0
6
1
7
1
0
—
—
—
8
2
0
1
0
0
0
3
0
1
1
1
0
2
1
3
1
0
0
4
1
5
1
0
6
1
7
(n = 0 to 7)
Read Strobe Timing: RDNCR can be used to select either of two negation timings (at the end of
the read cycle or one half-state before the end of the read cycle) for the read strobe (
5'
) used in
the basic bus interface space.
Chip Select (
&6
&6
&6
&6
) Assertion Period Extension States: Some external I/O devices require a setup
time and hold time between address and
&6
signals and strobe signals such as
5'
,
+:5
, and
/:5
. CSACR can be used to insert states in which only the
&6
,
$6
, and address signals are
asserted before and after a basic bus space access cycle.
6.4.3
Memory Interfaces
The memory interfaces in this LSI comprise a basic bus interface that allows direct connection of
ROM, SRAM, and so on; a DRAM interface that allows direct connection of DRAM; a
synchronous DRAM interface* that allows direct connection of synchronous DRAM; and a burst
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