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Change tile outputs to initialize with async reset #2611

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merged 3 commits into from
Aug 19, 2020

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ernie-sifive
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Related issue:

Type of change: bug report

Impact: no functional change

Development Phase: implementation

Release Notes

Tile notification output ports should be reset to 0 asynchronously when using SubsystemResetKey = ResetAsynchronous. Since the module reset for the Tile is a stretched Bool() reset, bring a second reset into the Tile sourced from the original external IO. When the notifications are placed in a withReset block, this resets the registers driving the outputs asynchronously.

@hcook, there's probably a cleaner way to connect the core_reset IO into the Tile...

Also changed the RationalCrossing so that the sink (which may be in an async reset domain) does not act on any output from the source (which may be synchronously reset some time later) until after the source has completed its reset at the first clock edge.

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