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inverters.
Note: this change does NOT affect pin functionality or naming, and
does not require modifying your design. It does however affect some
board files, where keywords corresponding to active low pins will have
to be adjusted:
SPIResource(0, cs="C1", ...) → SPIResource(0, cs_n="C1", ...)
The new naming scheme will make it easier to write and audit board
files by clearly marking inverted pins in resource factories, similarly to
how `PinsN` indicates the same in bare resources.
Fixes #129.
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This commit adds the HDMI (called GDPI for licensing reasons) pins to the ULX3S platform.
The constraints were taken from https://github.com/emard/ulx3s-misc/blob/master/constraints/ulx3s_v20.lpf
The top bank of the ECP5 only support differential outputs, so make all differential pairs outputs.
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The boards available on the crowdsupply page, as well as my
hand-built board, all seem to use speed grade 6.
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This changes several incorrect IO_STANDARD attributes to IO_TYPE.
Signed-off-by: Oguz Meteer <info@guztech.nl>
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