
R
Chapter 9: Configuration and Status
Table 9-20: SGMII Status (Register 1) (Continued)
Bit(s) | Name | Description | Attributes | Default | |
Value | |||||
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| |
1.7 | Unidirectional | Always returns ‘1,’ writes ignored | returns 1 | 1 | |
| Ability |
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|
| |
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| |
1.6 | MF Preamble | Always returns a ‘1’ for this bit to indicate | returns 1 | 1 | |
| Suppression | that Management Frame Preamble |
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| |
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| Suppression is supported |
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| |
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|
| |
1.5 | Auto- Negotiation | 1 = | read only | 0 | |
| Complete | across SGMII link |
|
| |
|
| 0 = |
|
| |
|
| completed across SGMII link |
|
| |
|
|
|
|
| |
1.4 | Remote Fault | 1 = A fault on the Medium has been | read only | 0 | |
|
| detected | self |
| |
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| ||
|
| 0 = No fault of the Medium has been | clearing |
| |
|
| detected | on read |
| |
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| |
1.3 | Auto- Negotiation | Always returns a ‘1’ for this bit to indicate | returns 1 | 1 | |
| Ability | that the SGMII core is capable of Auto- |
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| |
|
| Negotiation |
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| |
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| |
1.2 | SGMII Link Status1 | 1 = SGMII Link is up | read only | 0 | |
|
| 0 = SGMII Link is down | self |
| |
|
| Latches '0' if SGMII Link Status goes | clearing |
| |
|
| on read |
| ||
|
| down. Clears to current SGMII Link |
| ||
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| Status on read. |
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| |
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| See table note for SGMII Link Status |
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| behavior. |
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1.1 | Jabber Detect | Always returns a ‘0’ for this bit since | returns 0 | 0 | |
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| Jabber Detect is not supported |
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| |
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1.0 | Extended Capability | Always returns a ‘0’ for this bit because no | returns 0 | 0 | |
|
| extended register set is supported |
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| |
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|
1.When high, the link is valid: synchronization of the SGMII link has been obtained and SGMII
When low, a valid link has not been established. Either SGMII link synchronization has failed or SGMII
Regardless of whether SGMII
138 | www.xilinx.com | Ethernet |
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| UG155 March 24, 2008 |