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bus: Wishbone to CSR bridge

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1 parent af74a89 commit 05d91c7104721c0dc475514cf10aaa7066d5d53b @sbourdeauducq sbourdeauducq committed Dec 11, 2011
Showing with 21 additions and 0 deletions.
  1. +21 −0 migen/bus/wishbone2csr.py
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+from migen.fhdl import structure as f
+from migen.corelogic import timeline
+from . import wishbone
+from . import csr
+
+class Inst():
+ def __init__(self):
+ self.wishbone = wishbone.Slave("to_csr")
+ self.csr = csr.Master("from_wishbone")
+ self.timeline = timeline.Inst(self.wishbone.cyc_i & self.wishbone.stb_i,
+ [(2, [f.Assign(self.wishbone.ack_o, 1)])])
+
+ def GetFragment(self):
+ sync = [
+ f.Assign(self.csr.we_o, self.wishbone.we_i),
+ f.Assign(self.csr.d_o, self.wishbone.dat_i),
+ f.Assign(self.csr.a_o, self.wishbone.adr_i[:16]),
+ f.Assign(self.wishbone.ack_o, 0),
+ f.Assign(self.wishbone.dat_o, self.csr.d_i)
+ ]
+ return f.Fragment(sync=sync) + self.timeline.GetFragment()

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