53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
from migen.fhdl.structure import *
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from migen.fhdl.module import Module
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from migen.genlib.cdc import MultiReg
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from migen.genlib.fifo import SyncFIFO
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from migen.genlib.record import Record
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from migen.genlib.misc import optree
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from migen.bank.description import *
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from milkymist.dvisampler.common import channel_layout
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class ChanSync(Module, AutoReg):
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def __init__(self, nchan=3, depth=8):
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self.valid_i = Signal()
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self.chan_synced = Signal()
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self._r_channels_synced = RegisterField(1, READ_ONLY, WRITE_ONLY)
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lst_control_starts = []
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all_control_starts = Signal()
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for i in range(nchan):
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name = "data_in" + str(i)
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data_in = Record(channel_layout, name=name)
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setattr(self, name, data_in)
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name = "data_out" + str(i)
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data_out = Record(channel_layout, name=name)
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setattr(self, name, data_out)
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###
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fifo = SyncFIFO(10, depth)
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self.add_submodule(fifo, "pix")
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self.comb += [
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fifo.we.eq(self.valid_i),
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fifo.din.eq(Cat(*data_in.flatten())),
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Cat(*data_out.flatten()).eq(fifo.dout)
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]
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is_control = Signal()
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is_control_r = Signal()
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self.sync.pix += If(fifo.readable & fifo.re, is_control_r.eq(is_control))
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control_starts = Signal()
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self.comb += [
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is_control.eq(~data_out.de),
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control_starts.eq(is_control & ~is_control_r),
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fifo.re.eq(~is_control | all_control_starts)
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]
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lst_control_starts.append(control_starts)
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self.comb += all_control_starts.eq(optree("&", lst_control_starts))
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self.sync.pix += If(~self.valid_i,
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self.chan_synced.eq(0)
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).Elif(all_control_starts, self.chan_synced.eq(1))
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self.specials += MultiReg(self.chan_synced, self._r_channels_synced.field.w)
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