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442 B


WARNING: VCCIO7 needs to be 1.2 V, otherwise damage to the ECP5 may occur

This is a sampling oscilloscope based TDR for the ECP5.

It requires at least 3 passive components, but works better with one additional transistor.


Example trace:

TDR trace

Gateware/ is the gateware and Gateware/ is the frontend to acquire data.