Table 539: Mii Status Register (Address 01D, 01H) - Broadcom BCM5722 Programmer's Manual

Programmer's Guide
10/15/07
MII Status Register
Bit Name
15 100BASE-T4 Capability
14 100BASE-TX FDX Capability
13 100BASE-TX Capability
12 10BASE-T FDX Capability
11 10BASE-T Capability
10:7 RESERVED
6 MF Preamble Suppression
5 Auto-Negotiation Complete
4 Reserved
3 Auto-Negotiation Capability
2 Link Status
1 Jabber Detect
0 Extended Capability
100BASE-T4 Capability
The PHY core is not capable of 100BASE-T4 operation and returns a 0 when bit 15 of the Status register is read.
100BASE-TX FDX Capability
The PHY core is capable of 100BASE-TX full-duplex operation and returns a 1 when bit 14 of the Status register is read.
100BASE-TX Capability
The PHY core is capable of 100BASE-TX half-duplex operation and returns a 1 when bit 13 of the Status Register is read.
10BASE-T FDX Capability
The PHY core is capable of 10BASE-T full-duplex operation and returns a 1 when bit 12 of the Status register is read.
10BASE-T Capability
The PHY core is capable of 10BASE-T half-duplex operation and returns a 1 when bit 11 of the Status Register is read.
MF Preamble Suppression
This bit is the only writable bit in the Status register. Setting this bit to a 1 allows subsequent MII management frames to be
accepted with or without the standard preamble pattern. When preamble suppression is enabled, only 2 preamble bits are
required between successive management commands, instead of the normal 32.
Document 5722-PG101-R

Table 539: MII Status Register (Address 01d, 01h)

R/W
RO
RO
RO
RO
RO
–
R/W
RO
RO
RO
RO
LL
RO
LH
RO
Bro adco m Co rp or atio n
Description
0 = Not 100BASE-T4 capable
1 = 100BASE-TX full-duplex capable
1 = 100BASE-TX half-duplex capable
1 = 10BASE-T full-duplex capable
1 = 10BASE-T half-duplex capable
–
1= Preamble may be suppressed
0 = Preamble always required
1 = Auto-negotiation process completed
0 = Auto-negotiation process not
completed
Ignore when read
1 = Auto-negotiation capable
0 = Not auto-negotiation capable
1 = Link is up (link pass state)
0 = Link is down (link fail state)
1 = Jabber condition detected
0 = No jabber condition detected
1 = Extended register capable
Transceiver Registers (BCM5906/BCM5906M)
BCM5722
Default
0
1
1
1
1
0000
0
0
0
1
0
0
1
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