I have a question about the spacing differences between TX to TX distance
and TX to RX distance. For example, in Intel PDG, TX to RX distance
requirement is stricter than TX to TX requirement. For example, for
SATA-Gen3, TX to TX: 7h for microstrip; TX to RX: 9h for microstrip where
h is the height of the mcrostrip layer.
If FEXT for TX to TX is -20db and NEXT for TX to RX is also -20db, I think
their noise levels are the same. Then why does Intel give stricter
requirements for the distance between TX to RX?
--
best wishes,
Jun Zhang
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