Implement CFG_CENTER primitives #76
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This PR corresponds to gatecat/nextpnr-xilinx-meta#5 |
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This implements all of the CFG_CENTER primitives.
BSCANE2 and STARTUPE2, arguably the most used,
have been tested working:
https://fosstodon.org/@hansfbaier/111185153200473777
https://fosstodon.org/@hansfbaier/111164220274385390
I also tested the USRDONEO output on STARTUPE2.