
R
Chapter 9: Configuration and Status
Table 9-31: 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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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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1.5 | Auto- Negotiation | Ignore this bit because | returns 1 | 0 | |
| Complete | is not included. |
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1.4 | Remote Fault | Ignore this bit because | returns 0 | 0 | |
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| is not included |
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1.3 | Auto- Negotiation | Ignore this bit because | returns 0 | 0 | |
| Ability | is not included |
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1.2 | SGMII Link Status1 | 1 = SGMII Link is up | read only | 0 | |
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| 0 = SGMII Link is down | self |
| |
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| Latches '0' if SGMII Link Status goes | clearing |
| |
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| on read |
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| down. Clears to current SGMII Link |
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| Status on read. |
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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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1.0 | Extended Capability | Always returns a ‘0’ for this bit because no | returns 0 | 0 | |
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| extended register set is supported |
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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
148 | www.xilinx.com | Ethernet |
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| UG155 March 24, 2008 |