AM79C975VCW datasheet(256/304 Pages) AMD

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256

Am79C973/Am79C975

P R E L I M INARY

These are the upper 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.

Node ID Registers

The following registers provide the IEEE and IP ad-

dresses of the node using the Am79C975 devices, as

well as of the management station.

Node IEEE Address 0 (MReg Address 9)

This register is a shadow register of the APROM loca-

tion 00h. APROM location 00h is loaded from the EE-

PROM.

Bit No.

Name and Description

7:0

N_IEEE_ADR[7:0]

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

Byte 0 (the LSB) of the Node IEEE Address

48-bit address of the station, the Am79C975

controller is used in.

Node IEEE Address 1 (MReg Address 10)

This register is a shadow register of the APROM loca-

tion 01h. APROM location 01h is loaded from the EE-

PROM.

Bit No.

Name and Description

7:0

N_IEEE_ADR[15:8]

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

Byte 1 of the Node IEEE Address register. The

Node IEEE Address is the unique 48-bit ad-

dress of the station, the Am79C975 controller

is used in.

Node IEEE Address 2 (MReg Address 11)

This register is a shadow register of the APROM loca-

tion 02h. APROM location 02h is loaded from the EE-

PROM.

Bit No.

Name and Description

7:0

N_IEEE_ADR[23:16]

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

Byte 2 of the Node IEEE Address register. The

Node IEEE Address is the unique 48-bit ad-

dress of the station, the Am79C975 controller

is used in.

Node IEEE Address 3 (MReg Address 12)

This register is a shadow register of the APROM loca-

tion 03h. APROM location 03h is loaded from the EE-

PROM.

Bit No.

Name and Description

7:0

N_IEEE_ADR[31:24]

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

Byte 3 of the Node IEEE Address register. The

Node IEEE Address is the unique 48-bit ad-

dress of the station, the Am79C975 controller

is used in.

Node IEEE Address 4 (MReg Address 13)

This register is a shadow register of the APROM loca-

tion 04h. APROM location 04h is loaded from the EE-

PROM.

Bit No.

Name and Description

7:0

N_IEEE_ADR[39:32]

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

Byte 4 of the Node IEEE Address register. The

Node IEEE Address is the unique 48-bit ad-

dress of the station, the Am79C975 controller

is used in.

Node IEEE Address 5 (MReg Address 14)

This register is a shadow register of the APROM loca-

tion 05h. APROM location 05h is loaded from the EE-

PROM.

Bit No.

Name and Description

7:0

N_IEEE_ADR[47:40]

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

Byte 5 (the MSB) of the Node IEEE Address

48-bit address of the station, the Am79C975

controller is used in.

Node IP Address 0 (MReg Address 15)

This register is loaded from the EEPROM.

Bit No.

Name and Description

7:0

N_IP_ADR[7:0]Default: 00hRead only, write

has no effect.

Byte 0 (the LSB) of the Node IP Address regis-

ter. The Node IP Address is the 32-bit address

used in the IP protocol header to address the

station, the Am79C975 controller is used in.

This register can also be used as general pur-

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