
Rev. 1.0, 09/01, page 181 of 904
6.7.2
Address Multiplexing
With continuous synchronous DRAM space, the row address and column address are multiplexed.
In address multiplexing, the size of the shift of the row address is selected with bits MXC2 to
MXC0 in DRAMCR. The address-precharge-setting command (Prechrge-sel) can be output on the
upper column address. Table 6.8 shows the relation between the settings of MXC2 to MXC0 and
the shift size. The MXC2 bit should be set to 1 when the synchronous DRAM interface is used.
Table 6.8
Relation between Settings of Bits MXC2 to MXC0 and Address Multiplexing
DRAMCR
Address Pins
MXC2 MXC1 MXC0
Shift
Size
A23 to
A16
A15 A14 A13 A12 A11 A10 A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
Row
address
0
x
x
Reserved (setting prohibited)
1
0
0
8 bits
A23 to
A16
A23 A22 A21 A20 A19 A18 A17 A16 A15 A14 A13 A12 A11 A10 A9
A8
1
9 bits
A23 to
A16
A15 A23 A22 A21 A20 A19 A18 A17 A16 A15 A14 A13 A12 A11 A10 A9
1
0
10 bits A23 to
A16
A15 A14 A23 A22 A21 A20 A19 A18 A17 A16 A15 A14 A13 A12 A11 A10
1
11 bits A23 to
A16
A15 A14 A13 A23 A22 A21 A20 A19 A18 A17 A16 A15 A14 A13 A12 A11
Column
address
0
x
x
Reserved (setting prohibited)
1
0
0
—
A23 to
A16
P
P
P
P
P
P
P
A8
A7
A6
A5
A4
A3
A2
A1
A0
1
—
A23 to
A16
P
P
P
P
P
P
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
1
0
—
A23 to
A16
P
P
P
P
P
A10 A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
1
—
A23 to
A16
P
P
P
P
A11 A10 A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
X: Don’t care.
P: Precharge-sel
Содержание H8S/2376 F-ZTAT
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