AM79C901AJCT AMD [Advanced Micro Devices], AM79C901AJCT Datasheet - Page 59

• Manufacturer Part Number: AM79C901AJCT
• Description: HomePHY Single-Chip 1/10 Mbps Home Networking PHY
• Manufacturer: AMD [Advanced Micro Devices]

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
Bits
15:0
15:10
Bits
9:4
3:0
PHY_ID[31-16]
PHY_ID[15-10]
PHY_ID[9-4]
PHY_ID[3-0]
Name
Name
Table 43. TBR2: 10BASE-T PHY Identifier Register (Register 2)
Table 44. TBR3: 10BASE-T PHY Identifier Register (Register 3)
IEEE Address (bits 19-24)
Manufacturer’s Model Number (bits 5-0)
Revision Number (bits 3-0); Register 3, bit
0, is LSB of PHY Identifier
IEEE Address (bits 3-18); Register 2, bit
15 is MSB of PHY Identifier
P R E L I M I N A R Y
Description
Description
Am79C901A
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.
Read/
Read/
Write
Write
R
R
R
R
Default Value (hex)
Default Value (hex)
0000
1A
37
01
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