4-2
MC92603 Quad Gigabit Ethernet Transceiver Reference Manual
MOTOROLA
MDIO Registers
The 2 least significant bits of the 5-bit address, MD_ADR1 and MD_ADR0, are used to
uniquely identify each MC92603 channel (00 indicates channel A, 01 = B, 10 = C, and
11 = indicates channel D).
The 2.5-MHz data interface clock, MD_CLK, is sourced at the MDIO master (MAC) and
is used by each slave MDIO device. The MC92603 is designed as MDIO slave devices.
The MDIO data signal, MD_DATA, is a bidirectional serial signal used to read and write
management data from/to the MDIO registers.
4.2
MDIO Registers
The specification calls for up to 64 registers to be supported by MDIO. Some registers must
be included to meet the minimum MDIO specification; they are identified as the basic
register set. Other registers are optional and are considered part of the extended register set.
The MC92603 has four sets of MDIO registers (one per transceiver channel). Registers for
address 0–6 and 15–18, as defined in the standard specification, are fully supported.
Registers 7–14 and 19–31 are not supported in the MC92603. The MDIO registers are
identified in Table 4-1.
Table 4-1. MDIO Management Register Set
MDIO Register
Address (RA)
Register Name
Basic/Extended
Register Set
Supported by
MC92603
0
Control
B
Yes
1
Status
2, 3
PHY identifier
E
4
Auto-negotiation advertisement
5
Auto-negotiation link partner base page ability
6
Auto-negotiation expansion
7
Auto-negotiation next page transmit
No
8
Auto-negotiation link partner received next page
9
Master-slave control register
10
Master-slave status register
11–14
Reserved
15
Extended status
B
Yes
16
Vendor specific—permanent configuration control
E
17
Vendor specific—channel configuration and status
18
Vendor specific—BERT error counter
19–31
Vendor specific—not implemented
No
Summary of Contents for MC92603
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