AM79C978VCSLASHW datasheet(191/261 Pages) AMD

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Am79C978

191

TBR2 and TBR3: 10BASE-T PHY Identifier

(Registers 2 and 3)

Registers 2 and 3 contain a unique PHY identifier, con-

sisting of 22 bits of the organizationally unique IEEE

Identifier, a 6-bit manufacturer’s model number, and a

4-bit manufacturer’s revision number. The most signifi-

cant bit of the PHY identifier is bit 15 of register 2; the

least significant bit of the PHY identifier is bit 0 of reg-

ister 3. Register 2, bit 15 corresponds to bit 3 of the

IEEE Identifier and register 2, bit 0 corresponds to bit

18 of the IEEE Identifier. Register 3, bit 15 corresponds

to bit 19 of the IEEE Identifier and register 3, bit 10 cor-

responds to bit 24 of the IEEE Identifier. Register 3, bits

9-4 contain the manufacturer’s model number and bits

3-0 contain the manufacturer’s revision number. These

registers are shown in Table 67 and Table 68.

Table 67.

TBR2: 10BASE-T PHY Identifier (Register 2)

Table 68.

TBR3: 10BASE-T PHY Identifier (Register 3)

Bits

Name

Description

Read/

Write

Default Value

Soft Reset

15-0

PHY_ID[31-16]

IEEE Address (bits 3-18); Register

2, bit 15 is MS bit of PHY Identifier

0000000000000000

(0000 Hex)

Retains original

Value

Bits

Name

Description

Read/Write

Default Value

Soft Reset

15-10

PHY_ID[15-10]

IEEE Address (bits 19-

24)

011010

(1A Hex)

Retains original value

9-4

PHY_ID[9-4]

Manufacturer’s Model

Number (bits 5-0)

110111

(37 Hex)

Retains original value

3-0

PHY_ID[3-0]

Revision Number (bits

3-0); Register 3, bit 0 is

LS bit of PHY Identifier

0000

Retains original value

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