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5 memory connection example – FUJITSU MB91460 SERIES FR60 User Manual

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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

0

7

8

9

31

21

22

ROW

BA

COLUMN

0

1110 9

31

23

24

ROW

1

12

BA

COLUMN

0

1110

13

31

25

26

ROW

1

12

2

A8

A9

A10

A11

A12

A14

A15

A7 A6 A5 A4 A3 A2 A1 A0

Access address bit

Access address bit

Access address bit

A8

A9

A10

A11

A14

A15

A7 A6 A5 A4 A3 A2 A1 A0

A8

A9

A10

A11

A12

A14

External 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

)