2015-02-09 06:57:05 -05:00
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from liteeth.common import *
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2015-02-11 19:19:36 -05:00
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from liteeth.generic import *
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2015-02-09 06:57:05 -05:00
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class LiteEthMACGap(Module):
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def __init__(self, dw, ack_on_gap=False):
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self.sink = sink = Sink(eth_phy_description(dw))
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self.source = source = Source(eth_phy_description(dw))
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###
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gap = math.ceil(eth_interpacket_gap/(dw//8))
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self.submodules.counter = counter = Counter(max=gap)
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self.submodules.fsm = fsm = FSM(reset_state="COPY")
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fsm.act("COPY",
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counter.reset.eq(1),
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Record.connect(sink, source),
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If(sink.stb & sink.eop & sink.ack,
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NextState("GAP")
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)
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)
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fsm.act("GAP",
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counter.ce.eq(1),
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sink.ack.eq(int(ack_on_gap)),
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If(counter.value == (gap-1),
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NextState("COPY")
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)
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)
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