iceSugar v1.5 Clock @ 6MHz

wuxx / icesugar

iCESugar FPGA Board (base on iCE40UP5k)

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iceSugar v1.5 Clock @ 6MHz #58

Closed ButterBison closed 5 months ago

ButterBison commented 5 months ago

I have just noticed that the ICE_CLK for my iceSugar v1.5 board is set at 6MHz. However the schematics indicate that the oscillator X1 is a 12MHz oscillator.

The only thing I can see that can divide the cock is the icelink.

I have tried with the iceprog tool as well to set the mco, but no luck.

$sudo ./icesprog -p
probe chip
board: [iCESugar]
flash: [w25q64] (8MB)
done

$ sudo ./icesprog -c 2
only iCESugar-Nano support mco select
^C

Can someone confirm this?

wuxx commented 5 months ago

Hello, iCESugar's clock is driven by iCELink's PA8, and the default should be 12MHz. How do you measure the 6MHz clock currently, with a logic analyzer or an oscilloscope?

ButterBison commented 5 months ago

Hi,

Thanks for your reply. I just made a measurement with logic analyzer on the jumper J1.

The clock is correct. I will need to double check my code. Closing this issue for now.