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Chapter 31 External Bus
9.SDRAM/FCRAM Interface Operation
● Using 8 - bit SDRAM/FCRAM (Big endian)
Total data bus width of 32 bits: Use four SDRAM/FCRAM modules.
Total data bus width of 16 bits: Use two SDRAM/FCRAM modules.
Figure 9-7 shows how to use 64 - Mbit SDRAM (one bank address and 12 row addresses).
SWE (WR) WE
CS0 to CS7 CS All chip select areas can be set as SDRAM/FCRAM space.
A0 to A9 A0 to A9 Addresses do not have to be shifted depending on the bus
width.
A10/AP A10/AP A10 for row address output; otherwise AP
A11 to A13 A11 to A13 Connected to the address used for SDRAM/FCRAM.
A14 BA0 BA for 2 bank product
A15 BA1 The pin is not used for a two - bank module.
D31 to D0 DQ The connection changes depending on the endian method
and data bus width.
For detailed connection, see Section " 4. Endian and Bus
Access " .
DQMUU,
DQMUL,
DQMLU,
DQMLL
DQM The connection changes depending on the endian method
and data bus width.
For detailed connection, see Section " 4. Endian and Bus
Access " .
Table 9-1 SDRAM/FCRAM Interface to SDRAM/FCRAM Connection Table
SDRAM/
FCRAM
interface
pin
SDRAM/
FCRAM pin
Remarks