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4 commits

Author SHA1 Message Date
whitequark 8b34602d91 vendor.xilinx_{7series,spartan6}: connect FCDE and IOB directly. 
Before this commit, in some cases there will be an inverter, which is
not allowed on an FDCE with IOB attribute set to true, as it will
interfere with packing.
 2019-06-17 15:47:56 +00:00
Jean-François Nguyen 412781e0c3 vendor.xilinx_spartan6: implement DDR I/O buffers and inverters. 2019-06-13 15:13:31 +00:00
whitequark efb2d773c3 build.{dsl,res,plat}: add PinsN and DiffPairsN. 2019-06-12 14:42:39 +00:00
Jean-François Nguyen d5ba26b174 vendor.xilinx_spartan6: implement. 2019-06-07 08:58:41 +00:00