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Using 32 - bit sdram, This lsi, Sdram(no.1) – FUJITSU MB91460 SERIES FR60 User Manual

Page 606: Sdram(no.2), Sdram(no.3), Sdram(no.4)

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Chapter 31 External Bus

9.SDRAM/FCRAM Interface Operation

Figure 9-8 Using 64 - Mbit SDRAM

When using one SDRAM module with a data width of 16 bits, SDRAMs No. 2, No. 3, and No. 4 are not required
and DQ15 to DQ0 must be left open.

When two SDRAM modules are used with a data width of 16 bits, SDRAMs No. 2 and No. 4 are not required.

When two SDRAM modules are used with a data width of 32 bits, SDRAMs No. 3 and No. 4 are not required.

Using 32 - bit SDRAM

When the data width is 32 bits: Use one or two SDRAM modules.

Figure 9-9

shows 64-Mbit SDRAM (one bank address and 12 row addresses).

Figure 9-9 Using 64 - Mbit

A11-A0

This LSI

CS7

CS6

SCAS

SRAS

SWE MCLKE

DQMUU

MCLKO

DQ31-0

IA11-IA0

SDRAM(No.1)

CS

CAS

RAS

WE

CKE

DQML

CLK

DQ15-DQ0

BA1

SDRAM(No.2)

CS

CAS

RAS

WE

CKE

DQML

CLK

DQ15-DQ0

SDRAM(No.3)

CS

CAS

RAS

WE

CKE

DQML

CLK

DQ15-DQ0

IA11-IA0

SDRAM(No.4)

CS

CAS

RAS

WE

CKE

DQML

CLK

DQ15-DQ0

[15-0]

[31-16]

[15-0]

[31-16]

DQMU

DQMU

DQMU

DQMU

DQMUL

DQMLU

DQMLL

IA11-IA0

IA11-IA0

A15 A14

BA0

BA1BA0

BA1BA0

BA1BA0

A11-A0

This LSI

CS7

CS6

SCAS

SRAS

SWE MCLKE

DQMUU

MCLKO

DQ31-0

IA11-IA0

SDRAM(No.1)

CS

CAS

RAS

WE CKE

DQM0

CLK

DQ31-DQ0

IA11-IA0

SDRAM(No.2)

CS

CAS

RAS

WE

CKE

DQM0

CLK

DQ31-DQ0

[31-0]

[31-0]

DQM1

DQM1

DQM3 DQM2

DQM3 DQM2

DQMUL

DQMLU

DQMLL

A14

BA

BA