59 lines
1013 B
Python
59 lines
1013 B
Python
from migen.fhdl.std import *
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from migen.genlib.fsm import *
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from migen.actorlib.fifo import *
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from migen.flow.actor import EndpointDescription
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user_layout = EndpointDescription(
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[ ("dst", 8),
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("length", 4*8),
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("error", 1),
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("d", 8)
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],
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packetized=True
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)
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phy_layout = [
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("d", 8)
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]
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class LiteUSBPipe:
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def __init__(self, layout):
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self.sink = Sink(layout)
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self.source = Source(layout)
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class LiteUSBTimeout(Module):
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def __init__(self, clk_freq, length):
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cnt_max = int(clk_freq*length)
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width = bits_for(cnt_max)
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self.clear = Signal()
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self.done = Signal()
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cnt = Signal(width)
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self.sync += \
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If(self.clear,
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cnt.eq(0)
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).Elif(~self.done,
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cnt.eq(cnt+1)
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)
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self.comb += self.done.eq(cnt == cnt_max)
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#
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# TB
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#
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import random
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def randn(max_n):
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return random.randint(0, max_n-1)
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class RandRun:
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def __init__(self, level=0):
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self.run = True
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self.level = level
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def do_simulation(self, selfp):
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self.run = True
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n = randn(100)
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if n < self.level:
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self.run = False
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