82576EB Datasheet, PDF (19/34 Pages) Intel Corporation – LAN Access Division

Intel^® 82576EB GbE Controller - Specification Changes
4. Updated Definition of SW EEPROM Port Identification LED Blinking (Word 0x4)
Change:
Driver software provides a method to identify an external port on a system through a
command that causes the LED's to blink. Based on the setting in word 0x4, the LEDs
drivers should blink between STATE1 and STATE2 when a port identification command is
issued.
When word 0x4 is equal to 0xFFFF or 0x0000, the blinking behavior reverts to a default.
See the following table.
Bit
15:12
11:8
7:4
3:0
Description
Control for LED 3
0000b or 1111b: Default LED Blinking operation is used.
0001b = Default in STATE1 + Default in STATE2.
0010b = Default in STATE1 + LED is ON in STATE2.
0011b = Default in STATE1 + LED is OFF in STATE2.
0100b = LED is ON in STATE1 + Default in STATE2.
0101b = LED is ON in STATE1 + LED is ON in STATE2.
0110b = LED is ON in STATE1 + LED is OFF in STATE2.
0111b = LED is OFF in STATE1 + Default in STATE2.
1000b = LED is OFF in STATE1 + LED is ON in STATE2.
1001b = LED is OFF in STATE1 + LED is OFF in STATE2.
All other values are Reserved.
Control for LED 2 – same encoding as for LED 3.
Control for LED 1 – same encoding as for LED 3.
Control for LED 0 – same encoding as for LED 3.
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5. SerDes Forced Mode Override EEPROM Setting
Change:
Bit 14 in EEPROM Compatibilty Word 0x3 is no longer reserved and defined as folows:
Bit
Name
Default Description
14
SerDes Forced
Mode Override
0
SerDes Forced Mode Enable:
0 = Normal operation Intel Driver will enable PCS_LCTL.AN_ENABLE
1 = Forced Mode enable. Intel Driver will not set PCS_LCTL.AN_ENABLE
This bit is only used by Intel drivers starting with Intel LAN Driver Release 16.4. This bit is
read by Intel driver to determine if the device should be operated in SerDes forced mode.
When the 82576 is not in SerDes mode this bit has no effect. The recommended setting
for this bit is 0.
Note:
Use the SerDes Forced Mode Override bit to allow the driver to disable Auto-Negotiation,
in order to work around the issue described in Specification Clarification #7.
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6. Update to the Sequence in Switching Between Media
This is an update to the “Transition to the SerDes/SGMII Mode” procedure in the Datasheet Search for
the procedure in Chapter 3 (Section 3.5.8.2.1*). Use the following updated steps.
Revision: 2.85
September 2012
Intel^® 82576EB GbE Controller
Specification Update
19