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Author SHA1 Message Date
whitequark 3e2ecdf2fb build.res,vendor: place clock constraint on port, not net, if possible. 
For most toolchains, these are functionally identical, although ports
tend to work a bit better, being the common case. For Vivado, though,
it is necessary to place them on the port because its timing analyzer
considers input buffer delay.

Fixes #301.
 2020-02-06 23:37:15 +00:00
schwigi 8184efd612 vendor.intel: fix output enable width for XDR=0 case. 
Fixes #297.
 2020-01-09 10:09:35 +00:00
Dan Ravensloft 72cfdb0c93 vendor.intel: silence meaningless warnings in nMigen files 2019-12-01 00:07:48 +00:00
Emily a783e4645d Refactor build script toolchain lookups. 
Now environment variable overrides no longer infect the build scripts.

_toolchain.overrides is dropped as probably misguided in the first place.

Fixes #251.
 2019-10-13 13:53:24 +00:00
whitequark 8021e2dd76 vendor.intel: add Quartus support. 
Co-authored-by: Dan Ravensloft <dan.ravensloft@gmail.com>
 2019-10-10 00:35:13 +00:00