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Chapter 4: Physical Interface
Table 4-11: Status Register (Register 1) (Cont'd)
Bit(s)
Name
1.8
Extended Status
1.7
Reserved
MF Preamble
1.6
Suppression
Auto-
1.5
Negotiation
Complete
1.4
Remote Fault
Auto-
1.3
Negotiation
Ability
(1)
1.2
Link Status
1.1
Jabber Detect
Extended
1.0
Capability
Notes:
1. When High, the link is valid: synchronization of the link has been obtained and Auto-Negotiation (if present and enabled) has
completed. When Low, a valid link has not been established. Either link synchronization has failed or Auto-Negotiation (if present
and enabled) has failed to complete. Regardless of whether Auto-Negotiation is enabled or disabled, there can be some delay to the
deassertion of this signal following the loss of synchronization of a previously successful link. This is due to the Auto-Negotiation
state machine which requires that synchronization is lost for an entire link timer duration before changing state. For more
information, see the IEEE Std 802.3-2002 specification.
Table 4-12: PHY Identifier (Registers 2 and 3)
Bit(s)
Name
Organizationally
2.15:0
Unique Identifier
Organizationally
3.15:10
Unique Identifier
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142
Description
The Ethernet MAC always returns a 1
for this bit, indicating the presence of the
extended register (Register 15).
Always returns 0, writes ignored.
The Ethernet MAC always returns a 1
for this bit to indicate the support of
management frame preamble
suppression.
1 = Auto-negotiation process
completed.
0 = Auto-negotiation process not
completed.
1 = Remote fault condition detected.
0 = No remote fault condition detected.
The Ethernet MAC always returns a 1
for this bit, indicating that the PHY is
capable of auto-negotiation.
1 = Link is up.
0 = Link is down.
This bit latches to 0 if the link status goes
down, and clears to the current link
status on read.
The Ethernet MAC always returns a 0
for this bit because jabber detect is not
supported.
The Ethernet MAC always returns a 0
for this bit because no extended register
set is supported.
Description
Organizationally Unique Identifier
(OUI) from IEEE is 0x000A35.
Organizationally Unique Identifier
(OUI) from IEEE is 0x000A35.
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Attributes
Default Value
Returns 1
Returns 0
Returns 1
Read Only
Read Only
Self Clearing
on read
Returns 1
Read Only
Self Clearing
on read
Returns 0
Returns 0
Attributes
Default Value
Returns
0000000000101000
OUI(3-18)
Returns
OUI(19-24)
Embedded Tri-Mode Ethernet MAC User Guide
UG074 (v2.2) February 22, 2010
R
1
0
1
0
0
1
0
0
0
110101
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