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dvisampler: replace parity with sof

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This commit is contained in:
Sebastien Bourdeauducq 2014-02-13 22:45:27 +01:00
parent 88d4962a1c
commit bdb47e7977
2 changed files with 11 additions and 17 deletions
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16
misoclib/dvisampler/analysis.py
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@ -116,7 +116,7 @@ class FrameExtraction(Module, AutoCSR):
self.b = Signal(8)
# in sys clock domain
word_layout = [("parity", 1), ("pixels", word_width)]
word_layout = [("sof", 1), ("pixels", word_width)]
self.frame = Source(word_layout)
self.busy = Signal()
@ -159,11 +159,12 @@ class FrameExtraction(Module, AutoCSR):
fifo.din.pixels.eq(cur_word),
fifo.we.eq(cur_word_valid)
]
new_frame_r = Signal()
self.sync.pix += [
If(new_frame_r, fifo.din.parity.eq(~fifo.din.parity)),
new_frame_r.eq(new_frame)
]
self.sync.pix += \
If(new_frame,
fifo.din.sof.eq(1)
).Elif(cur_word_valid,
fifo.din.sof.eq(0)
)
self.comb += [
self.frame.stb.eq(fifo.readable),
self.frame.payload.eq(fifo.dout),
@ -196,10 +197,9 @@ class FrameExtraction(Module, AutoCSR):
self._r_overflow.w.eq(sys_overflow & ~overflow_mask),
self.overflow_reset.i.eq(self._r_overflow.re)
]
self.sync += [
self.sync += \
If(self._r_overflow.re,
overflow_mask.eq(1)
).Elif(self.overflow_reset_ack.o,
overflow_mask.eq(0)
)
]

12
misoclib/dvisampler/dma.py
View file

@ -64,19 +64,13 @@ class DMA(Module):
alignment_bits = bits_for(bus_dw//8) - 1
fifo_word_width = 24*bus_dw//32
self.frame = Sink([("parity", 1), ("pixels", fifo_word_width)])
self.frame = Sink([("sof", 1), ("pixels", fifo_word_width)])
self._r_frame_size = CSRStorage(bus_aw + alignment_bits, alignment_bits=alignment_bits)
self.submodules._slot_array = _SlotArray(nslots, bus_aw, alignment_bits)
self.ev = self._slot_array.ev
###
# start of frame detection
sof = Signal()
parity_r = Signal()
self.sync += If(self.frame.stb & self.frame.ack, parity_r.eq(self.frame.payload.parity))
self.comb += sof.eq(parity_r ^ self.frame.payload.parity)
# address generator + maximum memory word count to prevent DMA buffer overrun
reset_words = Signal()
count_word = Signal()
@ -122,8 +116,8 @@ class DMA(Module):
fsm.act("WAIT_SOF",
reset_words.eq(1),
self.frame.ack.eq(~self._slot_array.address_valid | ~sof),
If(self._slot_array.address_valid & sof & self.frame.stb, NextState("TRANSFER_PIXELS"))
self.frame.ack.eq(~self._slot_array.address_valid | ~self.frame.payload.sof),
If(self._slot_array.address_valid & self.frame.payload.sof & self.frame.stb, NextState("TRANSFER_PIXELS"))
)
fsm.act("TRANSFER_PIXELS",
self.frame.ack.eq(self._bus_accessor.address_data.ack),