MOTOROLA
Chapter 4. Management Interface (MDIO)
4-5
MDIO Registers
4.2.3
MDIO RA 2 and 3—PHY Identifier Registers
Figure 4-2 shows the format for the PHY identifier registers in the MC92603. MDIO RAs
2 and 3 are read-only and contain a 32-bit pattern that uniquely identifies the MC92603.
They provide bits 3–24 of Motorola’s ‘organizational unique identifier’ (0x000A28), the 6
least significant bits (lsb) of the part number and the revision level for the MC92603.
4
Remote fault
Bit 4 is initialized to zero and is set when the receiver detects a remote fault. (R, LH, SC)
3
Auto-negotiation
ability
Bit 3 reports the AN ability per register 0.12. It may be changed via register 0.12 through
the MDIO interface. (R)
2
Link status
Bit 2 is initialized to zero. It reflects whether the receiver has achieved byte
synchronization. (R)
1
Jabber detect
Bit 1 is forced to zero and may not be modified. (R)
0
Extended capability
Bit 0 is forced to one and may not be modified. The MC92603 has a specific status and
configuration register (register 17) for each channel. (R)
1
R = read only, LH = latches high, and SC = self-cleaning.
Register
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
2
R
Bits 03–18 of OUI
W
Reset
0
1
0
1
0
0
0
1
0
1
0
0
0
0
0
0
Register
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
3
R
Bits 19–24 of OUI
Manufacturer’s Model #
Revision
W
Reset
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
Figure 4-3. PHY Identifier Registers (MDIO RA 2 and 3)
Table 4-3. Status Register (MDIO RA 1) Field Descriptions (continued)
Bits
Name
Description
1
Summary of Contents for MC92603
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