82562EZ(EX)/82547GI(EI) Dual Footprint Design Guide
3.1.6
Integrated Magnetics Module
The magnetics module has a critical effect on overall IEEE and regulatory conformance. The
device should meet the performance required for a design with reasonable margin to allow for
manufacturing variation. Occasionally, components that meet basic specifications may cause the
system to fail IEEE testing because of interactions with other components or the printed circuit
board itself. Carefully qualifying new magnetics modules can go a long way toward preventing this
type of problem.
The steps involved in magnetics module qualification are similar to those for oscillator
qualification:
1. Verify that the vendor's published specifications in the component datasheet meet the required
IEEE specifications.
2. Independently measure the component's electrical parameters on the test bench, checking
samples from multiple lots. Check that the measured behavior is consistent from sample to
sample as well as meeting the published specifications.
3. Perform physical layer conformance testing and EMC (FCC and EN) testing in real systems.
Vary temperature and voltage while performing system level tests (for IEEE only).
Magnetics modules for 1000BASE-T Ethernet are similar to those designed solely for
10/100 Mbps, with the exception of four differential signal pairs instead of two for 10/100 Mbps.
3.2
Designing with the 82562EZ(EX) Platform LAN Connect
Device
This section provides design guidelines specific to the PLC device.
3.2.1
Note:
82562EZ/EX PLC Device LAN Disable Guidelines
ICHx Integrated LAN Controller resides on the ICHx VccSus3_3 and VccSus1_8 power wells
(typically referred to as “auxiliary” (“aux”) or “standby” supplies at the platform level).
The ICHx Integrated LAN’s RST# is the ICHx Resume-well input. It can be held low indefinitely
to keep the ICHx Integrated LAN Controller in a reset state. The LAN Reset (RST#) signal must
not be deasserted sooner than 10 ms after the Resume power supply reaches its nominal voltage.
This ensures that the ICHx Integrated LAN Controller is initialized.
illustrates a possible
solution for ICHx Integrated LAN disable.
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