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sinara-hw / EEM_FMC_Carrier

HPC FMC carrier in EEM format
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support disabling OSC1 #10

Closed jordens closed 2 years ago

jordens commented 2 years ago

The muxes have very limited isolation. It helps a lot to be able to turn of the oscillator. The crosstalk from the always-on clocks (potentially MMCX and PE) might still be a killer and may require desoldering of jumpers. Also make sure there is guaranteed to be some clock available when the bitstream loads (pulls on CLK_SEL seem to be that one 10k down and the weak internal ups on the gpio extender, and OSC1:OE).

gkasprow commented 2 years ago

Yes, we experienced that in Urukul. Switching off the oscillator supply is a must.

marmeladapk commented 2 years ago

Done.