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2.10.2.4 eSPI Devices
At the time of this writing, the use case and design rules for eSPI are still being developed.
Designers of Modules and Carriers are provided with the following guidance:
The maximum trace length for Carrier routed eSPI traces
Carrier routed ESPI traces
Carrier routed SPI traces
clearance to any other traces.
shall
The Carrier
have a 33 Ohm series termination between 0.5" and 1" of the target device on the
ESPI_CK signal.
shall
The Carrier
have a 33 Ohm series termination between 0.5" and 1" of the target device on the
ESPI_IO_[0..3] signals.
shall
The Carrier
length match ESPI_CK and ESPI_IO_[0..3] within 250mils.
shall
The Carrier
length match eSPI_CK and ESPI_CS within 100mils.
shall
be routed at 50 Ohms.
shall
have 5 mil via to via clearance, 4 mil trace to via clearance, and 10 mil
shall not
exceed 4.5".
９０
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