litex/migen/bus/csr.py

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2011-12-04 18:16:44 -05:00
from migen.fhdl import structure as f
from functools import partial
class Master:
def __init__(self):
d = partial(f.Declare, self)
d("a_o", f.BV(16))
d("we_o")
d("d_o", f.BV(32))
d("d_i", f.BV(32))
class Slave:
def __init__(self):
d = partial(f.Declare, self)
d("a_i", f.BV(16))
d("we_i")
d("d_i", f.BV(32))
d("d_o", f.BV(32))
class Interconnect:
def __init__(self, master, slaves):
self.master = master
self.slaves = slaves
def GetFragment(self):
a = f.Assign
comb = []
rb = f.Constant(0, f.BV(32))
for slave in self.slaves:
comb.append(a(slave.a_i, self.master.a_o))
comb.append(a(slave.we_i, self.master.we_o))
comb.append(a(slave.d_i, self.master.d_o))
rb = rb | slave.d_o
comb.append(a(master.d_i, rb))
return f.Fragment(comb)