gateware.iostream.IOStreamer: let o_stream transfer if i_stream not rdy#675

Draft

purdeaandrei wants to merge 14 commits intoGlasgowEmbedded:mainfrom purdeaandrei:iostreamer_skid_buffer_updates

+541-62

Commits on Sep 22, 2024

gateware.iostream.IOStreamer: add support for sample delay
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QSPIController: add support for passing sample delay to IOStreamer
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Reapply "gateware.iostream.IOStreamer: fix bug for incorrect sampling DDR inputs"
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IOClocker: fix driving/sample half cycle earlier bug
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QSPIController: fix wrong edge sampled when divisor==0
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QSPIControllerApplet: auto-calculate default sample delay
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added sample delay tests
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test_iostream: refactor input sample tests so they can be reused
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test_iostream: sdr input sample test: use any edge to signify sampling
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gateware.iostream.IOStreamer: fix same-cycle skid buffer push/pop
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test_iostream: improve docstrings
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test_iostream: refactor sampling to make it use .sample()
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iostream ddr testcase: remove glitch mitigation, because new version of SimulatableDDRBuffer is glitchless
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gateware.iostream.IOStreamer: let o_stream transfer if i_stream not rdy
purdeaandrei
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