From adda930c682a6b2e2bb4e8b8d6da0ab055755645 Mon Sep 17 00:00:00 2001 From: Sebastien Bourdeauducq Date: Thu, 12 Dec 2013 17:37:31 +0100 Subject: [PATCH] fhdl/simplify: add FullMemoryWE decorator that splits memories to remove partial WEs --- migen/fhdl/simplify.py | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 migen/fhdl/simplify.py diff --git a/migen/fhdl/simplify.py b/migen/fhdl/simplify.py new file mode 100644 index 00000000..5876b013 --- /dev/null +++ b/migen/fhdl/simplify.py @@ -0,0 +1,41 @@ +from migen.fhdl.std import * +from migen.fhdl.specials import _MemoryPort +from migen.fhdl.decorators import ModuleDecorator +from migen.util.misc import gcd_multiple + +class FullMemoryWE(ModuleDecorator): + def transform_fragment(self, f): + newspecials = set() + + for orig in f.specials: + if not isinstance(orig, Memory): + newspecials.add(orig) + continue + global_granularity = gcd_multiple([p.we_granularity if p.we_granularity else orig.width for p in orig.ports]) + if global_granularity == orig.width: + newspecials.add(orig) # nothing to do + else: + for i in range(orig.width//global_granularity): + if orig.init is None: + newinit = None + else: + newinit = [(v >> i*global_granularity) & (2**global_granularity - 1) for v in orig.init] + newmem = Memory(global_granularity, orig.depth, newinit, orig.name_override + "_grain" + str(i)) + newspecials.add(newmem) + for port in orig.ports: + port_granularity = port.we_granularity if port.we_granularity else orig.width + newport = _MemoryPort(adr=port.adr, + + dat_r=port.dat_r[i*global_granularity:(i+1)*global_granularity] if port.dat_r is not None else None, + we=port.we[i*port_granularity//global_granularity] if port.we is not None else None, + dat_w=port.dat_w[i*global_granularity:(i+1)*global_granularity] if port.dat_w is not None else None, + + async_read=port.async_read, + re=port.re, + we_granularity=0, + mode=port.mode, + clock_domain=port.clock) + newmem.ports.append(newport) + newspecials.add(newport) + + f.specials = newspecials -- 2.30.2