AX88140AP datasheet(19/46 Pages) ASIX

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AX88140A

PRELIMINARY

ASIX ELECTRONICS CORPORATION

3.2.5 Configuration Base I/O Address Register (CBIO)

FIELD

R/W

DESCRIPTION

31:7

R/W

Configuration Base I/O Address : Defines the address assignment mapping of AX88140A‘s regs.

6:1

This field value is 0 when read

I/O Space Indicator : Determines that the register maps into the I/O space. The value in this field is 1.

Tab - 10 CBIO Configuration Base I/O Address Register Description

3.2.6 Configuration Base Memory Address Register (CBMA)

FIELD

R/W

DESCRIPTION

31:7

R/W

Configuration Base Memory Address : Defines the address assignment mapping of AX88140A‘s regs.

6:1

This field value is 0 when read

Memory Space Indicator : Determines that the register maps into the memory space. The value in this

field is 0.

Tab - 11 CBMA Configuration Base Memory Address Register Description

3.2.7 Expansion ROM Base Address Register (CBER)

FIELD

R/W

DESCRIPTION

31:10

R/W

Expansion ROM Base Address

9:1

This field value is 0 when read

R/W

Expansion ROM Enable Bit : Active high

Tab - 12 CBER Expansion ROM Base Address Register Description

3.2.8 Configuration Interrupt Register (CSIT)

FIELD

R/W

DESCRIPTION

31:24

MAX_LAT : time unit is equal to 0.25 microsecond.(28H)

23:16

MIN_GNT : Time unit is equal to 0.25 microsecond.(14H)

15:8

Interrupt Pin : The AX88140A uses INTA# and the read value is (01H).

7:0

R/W

Interrupt Line : The BIOS writes the routing information into this field.

Tab - 13 CSIT Configuration Interrupt Register Description

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