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82575EB Gigabit Ethernet Controller — External PHY Loopback
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
258 January 2011
9.4.4.1 Setting External PHY Loopback Mode
The following procedure should be used to put the 82575 in external PHY loopback mode:
• Set Link mode to PHY: CTRL_EXT.LINK_MODE (CSR 18h, bits 23:22) = 00b
• In the PHY control register (address 0 in the PHY):
— Set duplex mode (bit 8)
— Clear the Loopback bit (bit 14)
— Set the Auto Neg Enable bit (bit 12)
• Restart auto-negotiation (set bit 19)
• Reset the PHY (set bit 15)
• Wait for auto-negotiation to complete and then transmit and receive normally.
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