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oxidecomputer / gemini-bringup

EDA work for the Gemini bringup vehicle
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[Eth Switch] verify reset circuit #23

Closed cbiffle closed 4 years ago

cbiffle commented 4 years ago

The switch chip's datasheet includes a relatively elaborate reset circuit. We should convince ourselves that we have omitted it for good reasons, or include it. (This may wind up being a dup of #11.)

cbiffle commented 4 years ago

So, this was okay because of the fix to #11 -- the reset circuit from the datasheet is an RC circuit to bring up reset slowly, which was already present on the global ~RESET that was being fed in.

However, the fix to #22 un-fixed it by moving switch reset onto a separate ~ETH_RESET line. So this needs fixed.