The TX2 uses the Broadcom BCM54610 GbE Ethernet Phy. On p36 of the TX2 OWM product guide, it discusses a maximum length constraint of 109mm (690ps).
Our custom carrier board has a trace length of 157mm with little chance of being able to make this shorter due to mechanical constraints.
I am looking for:
A) The datasheet of the Broadcom BCM54610 (not available on their website) to check this 109mm spec,
B) Any advice on if this constraint can be broken and what we risk if we do (signal integrity I’m sure but other ICs are perfectly able to use differential traces for longer lengths), and
C) Any suggestions as to suitable full bi-directional buffers.
We specified a buffer, however, this is uni-directional which would likely break the cross over auto-negotiation.