Bibo, Yang

Hardware Assisted IEEE 1588 IP Core

The GMII BFM model in TOP and TSU simulation folders are incorrect.
The Preamble and SFD in the GMII mode should be 8B = 55,55,55,55,55,55,55,d5, rather than 4B = 55,55,55,5d.

Wrong Preamble and SFD in simulation

Can the period_adj be negative value (2's complement) and adjust timer backwards?

If yes, is the following line in rtc.v always true?

time_adj_08n_32f <= time_adj[39: 0] + {16'd0, time_adj_00n_24f};  // add the delta 

Thanks,
Frank

Precise time adjustment

The address decoding in reg.v should not be in bytes, since the address unit in SOPC core is in words.

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Hardware Assisted IEEE 1588 IP Core