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6 commits

Author SHA1 Message Date
whitequark c9879c795b build.{dsl,res,plat}: apply clock constraints to signals, not resources. 
This adds the Clock() build DSL element, and adds a resource manager
function add_clock_constraint() that takes a Pin or a Signal.
Note that not all platforms, in particular not any nextpnr platforms
at the moment, can add constraints on arbitrary signals.

Fixes #86.
 2019-06-05 08:52:30 +00:00
whitequark ab3f103e5a build.dsl: replace extras= with Attrs(). 
This change proved more tricky than expected due to downstream
dependencies, so it also includes some secondary refactoring.
 2019-06-05 07:02:08 +00:00
whitequark 4310254103 build.res: use ConstraintError iff a constraint invariant is violated. 
In particular don't use it for type errors.
 2019-06-04 11:00:11 +00:00
whitequark a013eb1f59 build.dsl: add support for connectors. 2019-06-03 13:47:00 +00:00
whitequark b1eab9fb3b build.plat: implement. 2019-06-01 16:43:27 +00:00
Jean-François Nguyen dd5bd1c88d build: add DSL for defining platform resources. 2019-04-24 11:49:01 +00:00