Intel CHIPSET 820E - Manual (Page 119)

Intel ® 820E Chipset
R
Design Guide 119
Figure 74. Termination Plane
N/C
RJ-45
Magnetics Module
RDP
RDN
TDP
TDN
Termination Plane
Additional capacitance that may need
to be added for EFT testing
term_plane
2.22.5. Intel
®
82562ET/EM Disable Guidelines
To disable the Intel 82562ET/EM, the device must be isolated (disabled) prior to reset (RSM_PWROK)
asserting. Using a GPIO, such as GPO28 to be LAN_Enable (enabled high), LAN will default to enabled
on initial power-up and after an AC power loss. This circuit shown below will allow this behavior. BIOS
by controlling the GPIO can disable the LAN microcontroller.
Figure 75. Intel
®
82562ET/EM Disable Circuit
10 k Ω Ω Ω Ω
MMBT3906
Intel® 82562ET/EM_Disable
VCC3_SBY
RSM_PWROK
GPIO_LAN_ENABLE
LAN Disable Circuit
10 k Ω Ω Ω Ω