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Chapter 31 External Bus
9.SDRAM/FCRAM Interface Operation
Figure 9-6 Examples of combinations of access addresses and Row/BANK/Column addresses
9.5 Memory Connection Example
This section shows the memory connection example.
Memory Connection Example
The SDRAM/FCRAM interface is connected to SDRAM/FCRAM as shown in Table 4.9 - 1 in principle.
Table 9-1 SDRAM/FCRAM Interface to SDRAM/FCRAM Connection Table
SDRAM/
FCRAM
interface
pin
SDRAM/
FCRAM pin
Remarks
MCLKO CLK
MCLKE CKE
SRAS (AS) RAS
SCAS (BAA) CAS
BA COLUMN
0789
31
2122
ROW
BA COLUMN
01110 9
31
2324
ROW
112
BA COLUMN
0111013
31
2526
ROW
112 2
A8A9A10A11A12A14A15 A7 A6 A5 A4 A3 A2 A1 A0
Access address bit
Access address bit
Access address bit
A8A9A10A11A14A15 A7 A6 A5 A4 A3 A2 A1 A0
A8A9A10A11A12A14External address pin
External address pin
External address pin
A7 A6 A5 A4 A3 A2 A1 A0
4M bytes (set ASZ to 0110
B
), 8-bit bus width (set DBW to 00
B
)
256 column (set PSZ to 000
B
), 2 banks (set BANK to 0
B
)
16M bytes (set ASZ to 1000
B
), 16-bit bus width (set DBW to 01
B
)
512 column (set PSZ to 001
B
), 4 banks (set BANK to 1
B
)
64M bytes (set ASZ to 1010
B
), 32-bit bus width (set DBW to 10
B
)
512 column (set PSZ to 001
B
), 4 banks (set BANK to 1
B
)