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Reapply IOStreamer DDR sampling fix, and also fix QSPI #684

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Please see individual commits.

@purdeaandrei purdeaandrei force-pushed the f_fix_iostreamer_incorrect_sampling_and_qspi branch from 82dd493 to dca941d Compare September 11, 2024 20:18
@purdeaandrei purdeaandrei marked this pull request as draft September 12, 2024 19:28
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Temporarily setting this to draft, to see what happens to the smaller PRs first.

@purdeaandrei purdeaandrei force-pushed the f_fix_iostreamer_incorrect_sampling_and_qspi branch from dca941d to 56bd185 Compare September 13, 2024 18:08
Added support for additionally delaying when the sample is taken.
Normally the samples are taken at a time when the input signals
change that have been launched at the same time as i_en, however
this allows us to take samples later, specified in number of
sync clock cycles. Additionally for ratio=2 iostreamer we can also
delay by half a clock cycle.
@purdeaandrei purdeaandrei force-pushed the f_fix_iostreamer_incorrect_sampling_and_qspi branch from 56bd185 to 8756b70 Compare September 22, 2024 03:01
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