10BASE-T PHY Management Registers
(TBRs)
The Am79C978 home networking device supports the
MII basic register set and extended register set. Both
sets of registers are accessible through the PHY Man-
agement Interface. As specified in the IEEE standard,
the basic register set consists of the Control Register
(Register 0) and the Status Register (Register 1). The
extended register set consists of Registers 2 to 31
(decimal).
Table 64 lists all the 10BASE-T registers implemented
in the device. All the reserved registers should not be
written to, and reading them will return a zero value.
Table 64. Am79C978 10BASE-T PHY Management
Register Set
Register
Address
Basic/
(in Decimal)
Register Name
PHY Control
PHY Status
Extended
0
1
B
B
E
2-3
PHY Identifier
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4
5
6
E
E
E
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7
E
E
E
8-15
16
Reserved
Interrupt Enable and
Status
17
18
PHY Control/Status
Reserved
E
E
PHY Management
Extension
19
E
20-23
24
Reserved
Summary Status
Reserved
E
E
E
25-31
188
Am79C978
AMD [ AMD ]
