Clock Source; Magnetics Module; Criteria For Integrated Magnetics Electrical Qualification; Integrated Magnetics Recommended Qualification Criteria - Intel Quark SoC X1000 Design Manual

21.2.1.1

Clock Source

All designs require a 50 MHz clock source. The PHY uses the 50 MHz source to generate
internal clocks for both the PHY circuits and the RMII interface. SoC generates this
50Mhz reference clock internally and is passed out of the SoC for routing to the PHY
and back to the MAC reference clock port. This methodology manages the clock skew
externally rather than resolving it internally.There are three steps to crystal
qualification:
1. Verify that the vendor's published specifications in the component datasheet meet
the required conditions for frequency, frequency tolerance, temperature, oscillation
mode and load capacitance as specified in the respective datasheet.
2. Perform physical layer conformance testing and EMC (FCC and EN) testing in real
systems.
3. Independently measure the component's electrical parameters in real systems.
Measure frequency at a test output to avoid test probe loading effects at the PHY.
Check that the measured behavior is consistent from sample to sample and that
measurements meet the published specifications. For crystals, it is also important
to examine startup behavior while varying system voltage and temperature.
21.2.1.2

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. Carefully qualifying new magnetics modules
prevents problems that might arise because of interactions with other components or
the printed circuit board itself.
The steps involved in magnetics module qualification are similar to those for crystal
qualification:
1. Verify that the vendor's published specifications in the component datasheet meet
or exceed 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 and that measurements meet 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.
21.2.1.3

Criteria for Integrated Magnetics Electrical Qualification

The following table gives the criteria used to qualify integrated magnetics.
Table 67. Integrated Magnetics Recommended Qualification Criteria (Sheet 1 of 2)
Open Circuit
Inductance
(OCL)
Insertion Loss
®
Intel Quark™ SoC X1000
PDG
148
®
Intel Quark™ SoC X1000—LAN Design Considerations and Guidelines
w/8 mA DC bias; at 25C
w/8 mA DC bias; at 0C to 70C
100 kHz through 999 kHz
1.0 MHz through 60.0 MHz
60.1 MHz through 80.0 MHz
80.1 MHz through 100.0 MHz
100.1 MHz through 125.0 MHz
400 uH Min
350 uH Min
1 dB Max
0.6 dB Max
0.8 dB Max
1.0 dB Max
2.4 dB Max
June 2014
Order Number: 330258-002US