Xilinx LogiCORE 1000BASE-X User Manual page 123

Management Registers
Table 9-4: Status Register (Register 1) (Continued)
Registers 2 and 3: PHY Identifiers
Ethernet 1000BASE-X PCS/PMA or SGMII v9.1
UG155 March 24, 2008
Bit(s) Name
1.4 Remote Fault
1.3 Auto- Negotiation
Ability
1
1.2 Link Status
1.1 Jabber Detect
1.0 Extended Capability
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 802.3
specification.
15
Reg 2
15
Reg 3
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Description
1 = Remote fault condition detected
0 = No remote fault condition detected
Always returns a '1' for this bit to indicate
that the PHY is capable of Auto-
Negotiation.
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.
Registers 2 and 3: PHY Identifiers
10 9
Default
Attributes
Value
Read only 0
Self-
clearing
on read
Returns 1 1
Read only 0
Self
clearing
on read
Returns 0 0
Returns 0 0
0
4 3 0
R
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