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Chapter 9: Configuration and Status
Table 9-30: SGMII Control (Register 0)
Bit(s) | Name |
| Description | Attributes | Default |
| Value | ||||
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0.15 | Reset | 1 | = Core Reset | read/write | 0 |
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| 0 | = Normal Operation | self clearing |
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0.14 | Loopback | 1 | = Enable Loopback Mode | read/write | 0 |
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| 0 | = Disable Loopback Mode |
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| When used with a RocketIO |
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| transceiver, the core is placed in |
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| internal loopback mode. |
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| With the TBI version, Bit 1 is |
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| connected to ewrap. When set to ‘1’ |
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| indicates to the external PMA |
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| module to enter loopback mode. |
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| See “Loopback,” page 197. |
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0.13 | Speed | Always returns a ‘0’ for this bit. | returns 0 | 0 | |
| Selection | Together with bit 0.6, speed selection |
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| (LSB) | of 1000 Mbps is identified |
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0.12 | Auto- | 1 = Enable SGMII | read/write | 1 | |
| Negotiation | Process |
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| Enable | 0 = Disable SGMII |
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| Process |
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0.11 | Power Down | 1 | = Power down | read/ write | 0 |
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| 0 | = Normal operation |
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| With the PMA option, when set to ’1’ |
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| the RocketIO transceiver is placed in |
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| a |
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| reset (see bit 0.15) to clear. |
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| With the TBI version this register bit |
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| has no effect. |
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0.10 | Isolate | 1 | = Electrically Isolate SGMII logic | read/write | 1 |
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| from GMII |
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| 0 | = Normal operation |
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0.9 | Restart Auto- | 1 | = Restart | read/write | 0 |
| Negotiation | Process across SGMII link | self clearing |
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| 0 | = Normal Operation |
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0.8 | Duplex Mode | Always returns a ‘1’ for this bit to | returns 1 | 1 | |
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| signal |
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0.7 | Collision Test | Always returns a ‘0’ for this bit to | returns 0 | 0 | |
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| disable COL test |
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0.6 | Speed | Always returns a ‘1’ for this bit. | returns 1 | 1 | |
| Selection | Together with bit 0.13, speed |
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| (MSB) | selection of 1000 Mbps is identified |
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146 | www.xilinx.com | Ethernet |
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| UG155 March 24, 2008 |