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symbiflow-arch-defs

SymbiFlow / symbiflow-arch-defs

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Incorrect PLL-BUFG-BUFGMUX handling

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rw1nkler
rw1nkler commented Aug 21, 2020

During the work on merging #1419 I figured out that the basic BUFGMUX example works differently on Arty Board and Nexys Video.

The example uses three LEDs:

  • led[2] - blinks with slow frequency
  • led[1] - blinks with high frequency
  • led[0] - blinks with the same frequency as led[2] or led[1] depending on sw[0] state.

On the Arty Board, the example works as intended. On Nexys Video, when

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