Xilinx LogiCORE 1000BASE-X User Manual page 132

R
Table 9-15: Status Register (Register 1) (Continued)
1. When high, the link is valid: synchronization of the link has been obtained and Auto-Negotiation (if present and enabled) has
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Bit(s) Name
1.10 100BASE-T2 Full
Duplex
1.9 100BASE-T2 Half
Duplex
1.8 Extended Status
1.7 Unidirectional Ability
1.6 MF Preamble
Suppression
1.5 Auto- Negotiation
Complete
1.4 Remote Fault
1.3 Auto- Negotiation
Ability
1
1.2 Link Status
1.1 Jabber Detect
1.0 Extended Capability
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 802.3
specification.
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Chapter 9: Configuration and Status
Description
Always returns a '0' for this bit since
100BASE-T2 Full Duplex is not supported
Always returns a '0' for this bit since
100BASE-T2 Half Duplex is not supported
Always returns a '1' for this bit to indicate
the presence of the Extended Register
(Register 15)
Always returns 1, writes ignored
Always returns a '1' for this bit to indicate
that Management Frame Preamble
Suppression is supported
Ignore this bit because Auto-Negotiation
is not included.
Always returns a '0' for this bit because
Auto-Negotiation is not included.
Ignore this bit because Auto-Negotiation
is not included.
1 = Link is up
0 = Link is down
Latches '0' if Link Status goes down.
Clears to current Link Status on read.
See table note for Link Status behavior.
Always returns a '0' for this bit since
Jabber Detect is not supported
Always returns a '0' for this bit since no
extended register set is supported
Ethernet 1000BASE-X PCS/PMA or SGMII v9.1
Default
Attributes
Value
returns 0 0
returns 0 0
returns 1 1
returns 1 1
returns 1 1
returns 1 1
returns 0 0
returns 0 0
read only 0
self
clearing
on read
returns 0 0
returns 0 0
UG155 March 24, 2008