23 lines
756 B
Python
23 lines
756 B
Python
from migen.bus import wishbone
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from migen.bus import csr
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from migen.fhdl import structure as f
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from migen.corelogic import timeline
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class Inst():
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def __init__(self):
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self.wishbone = wishbone.Slave("to_csr")
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self.csr = csr.Master("from_wishbone")
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self.timeline = timeline.Inst(self.wishbone.cyc_i & self.wishbone.stb_i,
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[(1, [f.Assign(self.csr.we_o, self.wishbone.we_i)]),
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(2, [f.Assign(self.wishbone.ack_o, 1)]),
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(3, [f.Assign(self.wishbone.ack_o, 0)])])
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def get_fragment(self):
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sync = [
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f.Assign(self.csr.we_o, 0),
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f.Assign(self.csr.d_o, self.wishbone.dat_i),
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f.Assign(self.csr.a_o, self.wishbone.adr_i[2:16]),
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f.Assign(self.wishbone.dat_o, self.csr.d_i)
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]
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return f.Fragment(sync=sync) + self.timeline.get_fragment()
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