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2 area configuration registers 0-7 (acr0-7) – FUJITSU MB91460 SERIES FR60 User Manual

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Chapter 31 External Bus

2.External Bus Interface Registers

Figure 2-1 Configuration of the Area Select Registers (ASR0-7)

Functions of Bits in the Area Select Registers (ASR0-7)

The start address can be set in the high-order 16 bits (bits A31-A16). Each chip select area starts with the
address set in this register and covers the range set by the four bits ASZ3-0 of the ASR0-7 registers.

The boundary of each chip select area obeys the setting of the four bits ASZ3-0 of the ACR0-7 registers. For
example, if an area of 1 MB is set by the four bits ASZ3-0, the low-order four bits of the ASR0-7 registers are
ignored and only bits A31-20 are valid.

The ASR0 register is initialized to 0000

H

by INIT and RST. ASR1-7 are not initialized by INIT and RST, and are

therefore undefined. After starting chip operation, be sure to set the corresponding ASR register before enabling
each chip select area with the CSER register.

2.2 Area Configuration Registers 0-7 (ACR0-7)

This section explains the configuration and functions of area configuration registers 0-7 (ACR0-
7).

Configuration of Area Configuration Registers 0-7 (ACR0-7)

The area configuration registers 0-7 (ACR0-7: FArea Configuration Register 0-7) set the function of each chip

Initial value

ASR0

15

14

13

12

2

1

0

INIT

RST

Access

00000640

H

A31

A30

A29

A18

A17

A16

0000

H

0000

H

W/R

ASR1

15

14

13

12

2

1

0

00000644

H

A31

A30

A29

A18

A17

A16

xxxx

H

xxxx

H

W/R

ASR2

15

14

13

12

2

1

0

00000648

H

A31

A30

A29

A18

A17

A16

xxxx

H

xxxx

H

W/R

ASR3

15

14

13

12

2

1

0

0000064C

H

A31

A30

A29

A18

A17

A16

xxxx

H

xxxx

H

W/R

ASR4

15

14

13

12

2

1

0

00000650

H

A31

A30

A29

A18

A17

A16

xxxx

H

xxxx

H

W/R

ASR5

15

14

13

12

2

1

0

00000654

H

A31

A30

A29

A18

A17

A16

xxxx

H

xxxx

H

W/R

ASR6

15

14

13

12

2

1

0

00000658

H

A31

A30

A29

A18

A17

A16

xxxx

H

xxxx

H

W/R

ASR7

15

14

13

12

2

1

0

0000065C

H

A31

A30

A29

A18

A17

A16

xxxx

H

xxxx

H

W/R