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Latch in out

See merge request !4

Håkan Johansson authored Aug 27, 2020 and Håkan Johansson committed Sep 10, 2020

Only det the valid data bits for 16-bit transfers.  This such that the data-stable-check only checks used bits.

Do not give the timeout_cnt a chance to count down to 0 if in BERR_HIGH_WAIT mode (i.e. end of TIMEOUT handling).

If someone is holding just one of the ds strobes, then it is not 00, but still not 11.  Check for not being 11.  Also check as and dtack checks to be similar.

int_go_consumed_strobe is by default '0', and only set when fired.  This means only set for one cycle in TIMEOUT.

int_data_strobe defaults to c_DATA_CLEAR and only set when fired.  (Less need to figure out when to clear it.)