Am79C989

21

PRELIMINARY

Device ID Registers (Reg 2-3)

Device ID Registers (Reg 2-3) contain Read/Only

(R/O) bits. Registers 2 and 3 designate a unique De-

vice ID: the manufacturer ID is designated by Reg 2 bits

15:0 and Reg 3 bits 15:10; the model number is desig-

nated by Reg 3 bits 9:4; the Revision Number is desig-

nated by Reg 3 bits 3:0. This register is not duplicated

for each port.

Table 9.

Register 2

Table 10.

Register 3

Auto-Negotiation Advertisement Register (Reg 4)

The Auto-Negotiation Advertisement Register (Reg 4)

contains Read/Write (R/W) or Read/Only (R/O) bits.

This register contains the advertised ability of the

QuEST device. This register is duplicated on a per port

basis. The purpose of this register is to advertise the

technology ability to the link partner device. When this

register is modified, Restart Auto-Negotiation (Reg 0,

bit 9) must be set to advertise the change.

Table 11.

Auto-Negotiation Advertisement Register (Reg 4)

Note: When this register is modified, Restart Auto-Negotiation (Reg 0, bit 9) must be set to advertise the change.

Bit(s)

Name

Description

Read/Write

Default/Reset

(binary)

Default/Reset

(Hex)

15:0

PHY_ID[31:16]

Bits 3-18 of the IEEE Organizationally

Unique Identifier.

R/O

0000 0000

0000 0000

0000

Bit(s)

Name

Description

Read/Write

Default/Reset

(binary)

Default/Reset

(Hex)

15:10

PHY_ID[15:10]

Bits 19-24 of the IEEE Organizationally

Unique Identifier.

R/O

01

1010

1A

9:4

PHY_ID[9:4]

QuEST Model Number

R/O

01

1111

1F

3:0

PHY_ID[3:0]

Revision Number

R/O

0000

0

Bit(s)

Name

Description

Read/

Write

Default/

Reset

15

Next Page

1 = Next page exchange requested;

0 = Next page exchange not requested.

R/W

0

14

Reserved

Written and read as zero.

R/O

0

13

Remote Fault

1 = Remote fault bit is inserted into the base link code word during

the Auto-Negotiation process;

0 = The base link code work will have the bit position for remote fault

as cleared.

R/W

0

12:11

Reserved

Written and read as zero.

R/O

0

10:7

Reserved

Written and read as zero.

R/O

0

6

Full Duplex

1 = Full Duplex capability is advertised;

0 = Full Duplex capability is not advertised.

R/W

0

5

Half duplex

1 = Half Duplex capability is advertised;

0 = Half Duplex capability is not advertised

R/W

1

4:0

Selector Field

The QuEST device is an IEEE 802.3 compliant device.

R/O

0x01