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Using 16 - bit sdram/fcram, Figure 9-7, This lsi – FUJITSU MB91460 SERIES FR60 User Manual

Page 605: Sdram(no.1), Sdram(no.2), Sdram(no.3), Sdram(no.4)

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Chapter 31 External Bus

9.SDRAM/FCRAM Interface Operation

Figure 9-7 Using 64 - Mbit SDRAM

When SDRAM modules are used with a total data width of 16 bits, SDRAMs No. 3 and No. 4 are not required and
DQ15 to DQ0 must be left open.

Using 16 - bit SDRAM/FCRAM

Total data width of 32 bits: Use two or four SDRAM modules.

Total data width of 16 bits: Use one or two SDRAM modules.

Figure 9-8

shows how to use 64-Mbit SDRAM (two bank addresses and 12 row addresses).

A11-A0

This LSI

CS6

or

CS7

SCAS

SRAS

SWE MCLKE

DQMUU

MCLKO

DQ31-0

SDRAM(No.1)

CS

CAS

RAS

WE CKE

DQM

CLK

DQ7-DQ0

IA11-IA0

SDRAM(No.2)

CS

CAS

RAS

WE

CKE DQM

CLK

DQ7-DQ0

IA11-IA0

SDRAM(No.3)

CS

CAS

RAS

WE

CKE DQM

CLK

DQ7-DQ0

IA11-IA0

SDRAM(No.4)

CS

CAS

RAS

WE

CKE

DQM

CLK

DQ7-DQ0

[7-0]

[31-24]

[23-16]

[15-8]

DQMUL

DQMLU

DQMLL

A14

BA

BA

BA

BA

IA11-IA0