AM79C901AVCT datasheet(59/90 Pages) AMD

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Am79C901A

PR ELI M IN AR Y

TBR2 and TBR3: 10BASE-T PHY Identifier Register (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, corre-

sponds to bit 19 of the IEEE identifier and register 3, bit

10, corresponds to bit 24 of the IEEE identifier. Regis-

ter 3, bits 9-4, contain the manufacturer’s model num-

ber and bits 3-0 contain the manufacturer’s revision

number. These registers are shown in Table 43 and

Table 44.

Table 43.

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

Table 44.

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

Bits

Name

Description

Read/

Write

Default Value (hex)

15:0

PHY_ID[31-16]

IEEE Address (bits 3-18); Register 2, bit

15 is MSB of PHY Identifier

0000

Bits

Name

Description

Read/

Write

Default Value (hex)

15:10

PHY_ID[15-10]

IEEE Address (bits 19-24)

R1A

9:4

PHY_ID[9-4]

Manufacturer’s Model Number (bits 5-0)

R37

3:0

PHY_ID[3-0]

Revision Number (bits 3-0); Register 3, bit

0, is LSB of PHY Identifier

R01

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