AM79C975VCW datasheet(255/304 Pages) AMD

255 / 304 page

Am79C973/Am79C975

255

P R E L I M INARY

Default: 22h Read only, write has no effect.

These are the lower 8-bits of a register that

identifies AMD as the manufacturer of the

Am79C975 device.

SMIU Vendor ID Register 1 (MReg Address 1)

This register is a shadow register of the PCI Vendor ID

loaded from the EEPROM.

Bit No.

Name and Description

7:0

MVENDOR_ID[15:8]

Default: 10h Read only, write has no effect.

These are the upper 8-bits of a register that

identifies AMD as the manufacturer of the

Am79C975 device.

SMIU Device ID Register 0 (MReg Address 2)

This register is a shadow register of the PCI Device ID

Bit No.

Name and Description

7:0

MDEVICE_ID[7:0]

Default: 00h Read only, write has no effect.

These are the lower 8-bits of a register that

identifies the Am79C975 device within AMD’s

product line.

SMIU Device ID Register 1 (MReg Address 3)

This register is a shadow register of the PCI Device ID

Bit No.

Name and Description

7:0

MDEVICE_ID[15:8]

Default: 20h Read only, write has no effect

These are the upper 8-bits of a register that

identifies the Am79C975 device within AMD’s

product line.

SMIU Revision ID Register (MReg Address 4)

This register is a shadow register of the PCI Revision

ID Register.

Bit No.

Name and Description

7:0

MREVISION_ID

Default: 40h Read only, write has no effect

This 8-bit register specifies the Am79C975

controller revision number. The upper 4 bits of

the register value are fixed to 4h, the lower four

bits are silicon-revision dependent. The initial

revision value will be 40h.

SMIU Subsystem Vendor ID Register 0 (MReg

Address 5)

This register is a shadow register of the PCI Subsystem

Vendor ID Register bits 7:0. The PCI Subsystem Ven-

dor ID Register is loaded from the EEPROM.

Bit No.

Name and Description

7:0

MSUBVEN_ID[7:0]Default:

00hRead

only,

write has no effect

These are the lower 8-bits of a register that to-

gether with the Subsystem ID uniquely identi-

fies

the

add-in

card

subsystem

the

Am79C975 device is used in.

SMIU Subsystem Vendor ID Register 1 (MReg

Address 6)

This register is a shadow register of the PCI Subsystem

Vendor ID Register bits 15:8. The PCI Subsystem Ven-

dor ID Register is loaded from the EEPROM.

Bit No.

Name and Description

7:0

MSUBVEN_ID[15:8]

Default: 00h Read only, write has no effect

These are the upper 8-bits of a register that to-

gether with the Subsystem ID uniquely identi-

fies

the

add-in

card

subsystem

the

Am79C975 device is used in.

SMIU Subsystem ID Register 0 (MReg Address 7)

This register is a shadow register of the PCI Subsystem

ID Register bits 7:0. The PCI Subsystem ID Register is

loaded from the EEPROM.

Bit No.

Name and Description

7:0

MSUBSYS_ID[7:0]Default:

00hRead

only,

write has no effect

These are the lower 8-bits of a register that to-

gether with the Subsystem Vendor ID uniquely

identifies the add-in card or subsystem the

Am79C975 device is used in.

SMIU Subsystem ID Register 1 (MReg Address 8)

This register is a shadow register of the PCI Subsystem

Vendor ID Register bits 15:8. The PCI Subsystem ID

Bit No.

Name and Description

7:0

MSUBSYS_ID[15:8]

Default: 00h Read only, write has no effect.

AM79C975VCW Datenblatt(PDF) 255 Page - Advanced Micro Devices

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