IDE Configuration

12.2.1VID–Vendor Identification Register (Function 1)

Address Offset:

00–01h

Default Value:

8086h

Attribute:

Read only

The VID Register contains the vendor identification number. This register, along with the Device Identification Register, uniquely identifies any PCI device. Writes to this register have no effect.

Bit

Description

15:0 Vendor Identification Number. This is a 16-bit value assigned to Intel

12.2.2DID–Device Identification Register (Function 1)

Address Offset:

02–03h

Default Value:

7601h

Attribute:

Read only

The DID Register contains the device identification number. This register, along with the VID Register, defines the IFB Function. Writes to this register have no effect.

Bit

Description

15:0 Device Identification Number. This is a 16-bit value assigned to the IFB IDE Controller Function.

12.2.3PCICMD–PCI Command Register (Function 1)

Address Offset:

04–05h

Default Value:

0000h

Attribute:

Read/Write

The PCICMD Register controls access to the I/O space registers.

Bit

Description

 

 

15:10

Reserved.

 

 

9

Fast Back to Back Enable (FBE). This bit is hardwired to 0.

 

 

8

SERR# Enable. This bit is hardwired to 0.

 

 

7

Wait Cycle Control. This bit is hardwired to 0.

 

 

6

Parity Error Response. This bit is hardwired to 0.

 

 

5

VGA Palette Snoop. This bit is hardwired to 0.

 

 

4

Postable Memory Write and Invalidate Enable. This bit is hardwired to 0.

 

 

3

Special Cycle Enable. This bit is hardwired to 0.

 

 

2

Bus Master Function Enable (BME). 1=Enable. 0=Disable.

 

 

1

Memory Space Enable. This bit is hardwired to 0.

 

 

0

I/O Space Enable (IOSE). This bit controls access to the I/O space registers. When IOSE=1,

 

access to the Legacy IDE ports (both primary and secondary) and the PCI Bus Master IDE I/O

 

Registers is enabled. The Base Address Register for the PCI Bus Master IDE I/O Registers should

 

be programmed before this bit is set to 1.

 

 

12-2

Intel® 460GX Chipset Software Developer’s Manual