AM79C978 Advanced Micro Devices, AM79C978 Datasheet - Page 191

• Manufacturer Part Number: AM79C978
• Description: Single-Chip 1/10 Mbps PCI Home Networking Controller
• Manufacturer: Advanced Micro Devices

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-
15-0
15-10
9-4
3-0
Bits
Bits
PHY_ID[31-16]
PHY_ID[15-10]
PHY_ID[9-4]
PHY_ID[3-0]
Name
Name
Table 67. TBR2: 10BASE-T PHY Identifier (Register 2)
Table 68. TBR3: 10BASE-T PHY Identifier (Register 3)
IEEE Address (bits 3-18); Register
2, bit 15 is MS bit of PHY Identifier
IEEE Address (bits 19-
24)
Manufacturer’s Model
Number (bits 5-0)
Revision Number (bits
3-0); Register 3, bit 0 is
LS bit of PHY Identifier
Description
Description
Am79C978
Read/Write
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.
RO
RO
RO
Read/
Write
RO
011010
(1A Hex)
110111
(37 Hex)
0000
0000000000000000
(0000 Hex)
Default Value
Default Value
Retains original value
Retains original value
Retains original value
Retains original
Value
Soft Reset
Soft Reset
191