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xilinx_ise: disable SRL extraction on synchronizers

This commit is contained in:
Sebastien Bourdeauducq 2013-02-23 19:43:12 +01:00
parent ef833422c7
commit 56ae0f0714
1 changed files with 18 additions and 0 deletions
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18
mibuild/xilinx_ise.py
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@ -2,6 +2,8 @@ import os, struct, subprocess
from decimal import Decimal
from migen.fhdl.structure import *
from migen.fhdl.specials import SynthesisDirective
from migen.genlib.cdc import *
from mibuild.generic_platform import *
from mibuild.crg import CRG, SimpleCRG
@ -108,7 +110,23 @@ bitgen -g Binary:Yes -w {build_name}-routed.ncd {build_name}.bit
if r != 0:
raise OSError("Subprocess failed")
class XilinxMultiRegImpl(MultiRegImpl):
def get_fragment(self):
disable_srl = set(SynthesisDirective("attribute shreg_extract of {r} is no", r=r)
for r in self.regs)
return MultiRegImpl.get_fragment(self) + Fragment(specials=disable_srl)
class XilinxMultiReg:
@staticmethod
def lower(dr):
return XilinxMultiRegImpl(dr.i, dr.idomain, dr.o, dr.odomain, dr.n)
class XilinxISEPlatform(GenericPlatform):
def get_verilog(self, *args, special_overrides=dict(), **kwargs):
so = {MultiReg: XilinxMultiReg}
so.update(special_overrides)
return GenericPlatform.get_verilog(self, *args, special_overrides=so, **kwargs)
def build(self, fragment, clock_domains=None, build_dir="build", build_name="top",
ise_path="/opt/Xilinx", run=True):
tools.mkdir_noerror(build_dir)