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3.3
Integrated Magnetics Module
The magnetics module has a critical effect on overall IEEE and emissions 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 (PCB) 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 data sheet meet the required
IEEE specifications.
2. Independently measure the component's electrical parameters on a 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.
Note: 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 Mpbs.
3.4
Designing with the 82562GZ(GX) Platform LAN Connect
Device
This section provides design guidelines specific to the PLC device.
3.4.1
Power Supplies for 82562GZ(GX) PLC Implementations
The 82562GZ(GX) PLC device uses a single 3.3 V power supply. The 3.3 V supply must provide
approximately 90 mA of current for full speed operation. Standby power must be furnished in order
to wake up from a power down.
3.4.2
82562GZ(GX) Device Test Capability
The 82562GZ(GX) device contains an XOR test tree mechanism for simble board tests. Details of
the XOR tree operation are contained in the 82562GZ and 82562GX datasheets.
3.4.3
82562GZ/GX PLC Device LAN Disable Guidelines
For 82562GZ(GX) drop-in mode LAN disable circuit, see the "Drop-in Replacement Schematic"
in
Section 7.0
For the new single pin LAN Disable circuit available in modes 1-4, see the related schematics in
Section
7.0.
Application Note (AP-468)
82541PI(ER) and 82562GZ(GX) Dual Footprint LOM Design Guide
and the appropriate 82562EZ(EX) product design guide.
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