WG82577LM S LGWS Intel, WG82577LM S LGWS Datasheet - Page 52

• Manufacturer Part Number: WG82577LM S LGWS
• Manufacturer: Intel

Specifications of WG82577LM S LGWS

• Lead Free Status / RoHS Status: Supplier Unconfirmed

7.5
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PHY Loopback
PHY loopback is supported in the 82577. Software or firmware should set the 82577 to
the loopback mode (via the MDIC register) writing to the PHY Loopback Control register
(address 19). The MAC must be in forced link and in full duplex mode for PHY loopback
to operate. The following bits must be configured to enable PHY loopback:
CTRL.FRCDPLX = 1b: // force duplex mode by the MAC
CTRL.FD = 1b: // Set full-duplex mode
82577 GbE PHY—Device Functionality