Just to understand the CTLE / DFE Adaptation in DS100DF410.
Can you confirm the affirmations below or correct / clarify if the understanding is wrong?
If I use the CTLE / DFE Adaptation, each time the link goes up (CDR pass from a unlock state to a lock state) both CTLE and DFE re-adapt to look the best system settings. This event of the re-adaptation is the same as a forced CDR reset event.
Without an event of CDR lock or a CDR reset the adaptation keep happening, but in a fine tuning level, then If I reconfigure partner emphasys without generate an link down event it is required to force a CDR reset to re-adapt the boost levels of the CTLE and DFE because depending of the level of partner emphasys modification the continuous adaptation can't reach the best settings without re-adapt the boost levels.
In a System that has a multirate 1.25G / 10.3125 port, there is no need to reset the CDR every time the link goes up to re-start the CTLE/DFE adaptation, because in the speed change the CDR will unlock e re-lock generating a re-adaptation equal as a CDR reset will do.
In a system that has KR negotiation capability (that reconfigures emphasis) is preferred to turn off the KR emphasys negotiation and select a fixed configuration of the transceivers output levels to avoid the CTLE and DFE adaptation adapt in a bad / high BER configuration.
