HD6433044 Datasheet, PDF(180/867 Page) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

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HD6433044 Datasheet, PDF (180/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

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Example 2: Connection to 2WE 4-Mbit DRAM (16-Mbyte Mode): Figure 7-9 shows typical

interconnections to a single 2WE 4-Mbit DRAM, and the corresponding address map. Figure 7-10

shows a setup procedure to be followed by a program for this example.

The DRAM in this example has 10-bit row addresses and 8-bit column addresses. Its address area

is H'600000 to H'67FFFF.

H8/3048 Series

A18

A17

A8

A7

A6

A5

A4

A3

A2

A1

CS 3

RD

HWR

LWR

D15 to D 0

2 WE 4-Mbit DRAM with 10-bit

row address, 8-bit column address,

and Ã 16-bit organization

A9

A8

A7

A6

A5

A4

A3

A2

A1

A0

RAS

CAS

UW

LW

OE

I/O15 to I/O 0

a. Interconnections (example)

H'600000

H'67FFFF

H'680000

DRAM area

Not used

Area 3 (16-Mbyte mode)

H'7FFFFF

b. Address map

Figure 7-9 Interconnections and Address Map for 2WE 4-Mbit DRAM (Example)

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