Fujitsu FR60 Hardware Manual page 254

CHAPTER 4 EXTERNAL BUS INTERFACE
❍ 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 4.9-8 shows how to use 64-Mbit SDRAM (two bank addresses and 12 row addresses).
CS7 CS6
CS
CS
CS
CS
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.
234
Figure 4.9-8 Using 64-Mbit SDRAM
This LSI
A15 A14 A11-A00
SRAS SCAS SWE MCLKE
BA1 BA0 IA11-IA0
WE CKE
RAS CAS
SDRAM(No.1)
WE CKE
IA11-IA0 RAS CAS
BA1BA0
SDRAM(No.2)
WE CKE
BA1BA0 IA11-IA0 RAS CAS
SDRAM(No.3)
IA11-IA0
RAS CAS WE
BA1BA0
SDRAM(No.4)
DQMUU DQMLU
DQMUL DQMLL
MCLK
DQMU DQML CLK
DQMU DQML CLK
DQMU DQML CLK
CKE DQMU DQML CLK
DQ31-DQ0
[31-16]
DQ15-DQ0
[15-0]
DQ15-DQ0
[31-16]
DQ15-DQ0
[15-0]
DQ15-DQ0