CRG: support reset inversion

diff --git a/mibuild/crg.py b/mibuild/crg.py
index 6448ec49c6e7cdeae14889cae817f53db3ae3ad0..131b7e6270f589f89fd1888de950dc4f0b8b69e6 100644 (file)
--- a/mibuild/crg.py
+++ b/mibuild/crg.py
@@ -10,7 +10,11 @@ class CRG(Module):
                return r
 
 class SimpleCRG(CRG):
-       def __init__(self, platform, clk_name, rst_name):
+       def __init__(self, platform, clk_name, rst_name, rst_invert=False):
                        self.cd = ClockDomain("sys")
                        platform.request(clk_name, None, self.cd.clk)
-                       platform.request(rst_name, None, self.cd.rst)
+                       if rst_invert:
+                               rst_n = platform.request(rst_name)
+                               self.comb += self.cd.rst.eq(~rst_n)
+                       else:
+                               platform.request(rst_name, None, self.cd.rst)