82598EB Datasheet, PDF (130/596 Pages) Intel Corporation – Intel® 82598EB 10 Gigabit Ethernet Controller Datasheet

Intel^® 82598EB 10 GbE Controller - Specific Function Enable/Disable
It is recommended to keep all the functions at their respective location, even when other functions are
disabled. If function #0 (either LAN0 or LAN1) is disabled, then it does not disappear from the PCIe
configuration space. Rather, the function presents itself as a dummy function. The device ID and class
code of this function changes to other values (dummy function Device ID 0x106A, Class Code
0xFF0000). In addition, the function does not require any memory or I/O space, and does not require
an interrupt line.
Table 3-38. PCI Functions Index
PCI Function #
Both LAN functions are enabled
Both LAN functions are enabled
LAN 0 is disabled
LAN 0 is disabled (pin)
LAN 1 is disabled (pin)
LAN 1 is disabled
Both LAN functions are disabled
Both LAN functions are enabled
Both LAN functions are enabled
LAN 0 is disabled
LAN 0 is disabled (pin)
LAN 1 is disabled (pin)
LAN 1 is disabled
Both LAN functions are disabled
LAN Function
Select
Function 0
Function 1
0
LAN 0
LAN 1
1
LAN 1
LAN 0
0
Dummy
LAN1
1
LAN 1
Disable
0
LAN 0
Disable
1
Dummy
LAN 0
All PCI functions are disabled entire 82598 is at deep power
down
0
LAN 0
LAN 1
1
LAN 1
LAN 0
0
LAN 1
Disable
1
LAN 1
Disable
0
LAN 0
Disable
1
LAN 0
Disable
All PCI functions are disabled entire 82598 is at deep power
down
Dummy Function
Enable
1
1
1
1
1
1
1
0
0
0
0
0
0
0
3.2.2.3 Event Flow for Enable/Disable Functions
This section describes the driving levels and event sequence for 82598 functionality. Following an
internal power on reset/LAN_PWR_GOOD/PE_RST_N/in-band reset, the LANx_DIS_N signals should be
driven high (or left open) for nominal operation. If any of the LAN functions are not required statically,
its associated disable strapping pin can be tied statically to low.
3.2.2.3.1 BIOS Disable the LAN Function at Boot Time by Using Strapping Option
1. Assume that following a power up sequence LANx_DIS_N signals are driven high.
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