4-4
MC92603 Quad Gigabit Ethernet Transceiver Reference Manual
MOTOROLA
MDIO Registers
4.2.2
MDIO RA 1—Status Register
Figure 4-2 shows the format for the status register, MDIO RA 1, in the MC92603. The
status register is a read-only register.
Table 4-3 lists the corresponding field descriptions for the status register.
15
14
13
12
11
10
9
8
R
100BASE-
T4
100BASE-X
Full-Duplex
100BASE-X
Half -Duplex
10 Mb/s
Full-
Duplex
10 Mb/s
Half-
Duplex
100BASE-
T2
Full-Duplex
100BASE-
T2
Half-Duplex
Extended
Status
W
Reset
0
0
0
0
0
0
0
1
7
6
5
4
3
2
1
0
R
Reserved
MF
Preamble
Suppress
Auto-
Negotiation
Complete
Remote
Fault
Auto-
Negotiation
Ability
Link
Status
Jabber
Detect
Extended
Capability
W
Reset
0
0
0/1
0/1
0/1
0
0
1
Figure 4-2. Status Register (MDIO RA 1)
Table 4-3. Status Register (MDIO RA 1) Field Descriptions
Bits
Name
Description
1
15
100BASE-T4
Bit 15 is forced to zero and may not be modified. MC92603 does not support
100BASE-T4 operation. (R)
14
100BASE-X
full-duplex
Bit 14 is forced to zero and may not be modified. MC92603 does not support
100BASE-X operation. (R)
13
100BASE-X
half -duplex
Bit 13 is forced to zero and may not be modified. MC92603 does not support
100BASE-X operation. (R)
12
10 Mb/s
full-duplex
Bit 12 is forced to zero and may not be modified. MC92603 does not support
100BASE-10 Mb/s operation. (R)
11
10 Mb/s
half-duplex
Bit 11 is forced to zero and may not be modified. MC92603 does not support
100BASE-10 Mb/s operation. (R)
10
100BASE-T2
full-duplex
Bit 10 is forced to zero and may not be modified. MC92603 does not support
100BASE-T2 operation. (R)
9
100BASE-T2
half-duplex
Bit 9 is forced to zero and may not be modified. MC92603 does not support
100BASE-T2 operation. (R)
8
Extended status
Bit 8 is forced to one and may not be modified. MC92603 supports extended status
operation. Extended status information is available in MDIO RA 15. (R)
7
Reserved
Bit 7 is forced to zero and may not be modified. (R)
6
MF preamble
suppression
Bit 6 is forced to zero and may not be modified. The MC92603 implementation of the
MDIO protocol requires a preamble for the management frames. (R)
5
Auto-negotiation
complete
Bit 5 is initialized to zero This bit is set when the channel has successfully completed
the AN sequence. (R)
Summary of Contents for MC92603
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