Rev. 1.0, 09/01, page 158 of 904
6.6.4
Pins Used for DRAM Interface
Table 6.6 shows the pins used for DRAM interfacing and their functions. Since the
&6
5
to
&6
8
pins are in the input state after a reset, set the corresponding DDR to 1 when
5$6
5
to
5$6
8
signals are output.
Table 6.6
DRAM Interface Pins
Pin
With DRAM
Setting
Name
I/O
Function
+:5
:(
Write enable
Output
Write enable for DRAM space
access
&6
5
5$6
5
/
5$6
Row address strobe 2/
row address strobe
Output
Row address strobe when area 2
is designated as DRAM space or
row address strobe when areas
2 to 5 are designated as
continuous DRAM space
&6
6
5$6
6
Row address strobe 3
Output
Row address strobe when area 3
is designated as DRAM space
&6
7
5$6
7
Row address strobe 4
Output
Row address strobe when area 4
is designated as DRAM space
&6
8
5$6
8
Row address strobe 5
Output
Row address strobe when area 5
is designated as DRAM space
8&$6
8&$6
Upper column address
strobe
Output
Upper column address strobe for
16-bit DRAM space access or
column address strobe for 8-bit
DRAM space access
/&$6
/&$6
Lower column address
strobe
Output
Lower column address strobe
signal for 16-bit DRAM space
access
5'
,
2(
2(
Output enable
Output
Output enable signal for DRAM
space access
:$,7
:$,7
Wait
Input
Wait request signal
A15 to A0
A15 to A0
Address pins
Output
Row address/column address
multiplexed output
D15 to D0
D15 to D0
Data pins
I/O
Data input/output pins
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