artiq/soc/artiqlib/rtio/core.py

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2014-07-26 06:23:35 +08:00
from migen.fhdl.std import *
from migen.bank.description import *
from migen.genlib.fifo import SyncFIFOBuffered
from migen.genlib.cdc import MultiReg
from artiqlib.rtio.rbus import get_fine_ts_width
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class _RTIOBankO(Module):
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def __init__(self, rbus, counter_width, fine_ts_width, fifo_depth, counter_init):
self.sel = Signal(max=len(rbus))
self.timestamp = Signal(counter_width+fine_ts_width)
self.value = Signal(2)
self.writable = Signal()
self.we = Signal()
self.underflow = Signal()
self.level = Signal(bits_for(fifo_depth))
# # #
counter = Signal(counter_width, reset=counter_init)
self.sync += [
counter.eq(counter + 1),
If(self.we & self.writable,
If(self.timestamp[fine_ts_width:] < counter + 2, self.underflow.eq(1))
)
]
fifos = []
for n, chif in enumerate(rbus):
fifo = SyncFIFOBuffered([
("timestamp", counter_width+fine_ts_width), ("value", 2)],
fifo_depth)
self.submodules += fifo
fifos.append(fifo)
# FIFO write
self.comb += [
fifo.din.timestamp.eq(self.timestamp),
fifo.din.value.eq(self.value),
fifo.we.eq(self.we & (self.sel == n))
]
# FIFO read
self.comb += [
chif.o_stb.eq(fifo.readable &
(fifo.dout.timestamp[fine_ts_width:] == counter)),
chif.o_value.eq(fifo.dout.value),
fifo.re.eq(chif.o_stb)
]
if fine_ts_width:
self.comb += chif.o_fine_ts.eq(fifo.dout.timestamp[:fine_ts_width])
selfifo = Array(fifos)[self.sel]
self.comb += self.writable.eq(selfifo.writable), self.level.eq(selfifo.level)
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class _RTIOBankI(Module):
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def __init__(self, rbus, counter_width, fine_ts_width, fifo_depth):
self.sel = Signal(max=len(rbus))
self.timestamp = Signal(counter_width+fine_ts_width)
self.value = Signal()
self.readable = Signal()
self.re = Signal()
self.overflow = Signal()
###
counter = Signal(counter_width)
self.sync += counter.eq(counter + 1)
timestamps = []
values = []
readables = []
overflows = []
for n, chif in enumerate(rbus):
if hasattr(chif, "oe"):
sensitivity = Signal(2)
self.sync += If(~chif.oe & chif.o_stb,
sensitivity.eq(chif.o_value))
fifo = SyncFIFOBuffered([
("timestamp", counter_width+fine_ts_width), ("value", 1)],
fifo_depth)
self.submodules += fifo
# FIFO write
if fine_ts_width:
full_ts = Cat(chif.i_fine_ts, counter)
else:
full_ts = counter
self.comb += [
fifo.din.timestamp.eq(full_ts),
fifo.din.value.eq(chif.i_value),
fifo.we.eq(~chif.oe & chif.i_stb &
((chif.i_value & sensitivity[0]) | (~chif.i_value & sensitivity[1])))
]
# FIFO read
timestamps.append(fifo.dout.timestamp)
values.append(fifo.dout.value)
readables.append(fifo.readable)
self.comb += fifo.re.eq(self.re & (self.sel == n))
overflow = Signal()
self.sync += If(fifo.we & ~fifo.writable, overflow.eq(1))
overflows.append(overflow)
else:
timestamps.append(0)
values.append(0)
readables.append(0)
overflows.append(0)
self.comb += [
self.timestamp.eq(Array(timestamps)[self.sel]),
self.value.eq(Array(values)[self.sel]),
self.readable.eq(Array(readables)[self.sel]),
self.overflow.eq(Array(overflows)[self.sel])
]
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class RTIO(Module, AutoCSR):
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def __init__(self, phy, counter_width=32, ofifo_depth=8, ififo_depth=8):
fine_ts_width = get_fine_ts_width(phy.rbus)
# Submodules
self.submodules.bank_o = InsertReset(_RTIOBankO(phy.rbus,
counter_width, fine_ts_width, ofifo_depth,
phy.loopback_latency))
self.submodules.bank_i = InsertReset(_RTIOBankI(phy.rbus,
counter_width, fine_ts_width, ofifo_depth))
# CSRs
self._r_reset = CSRStorage(reset=1)
self._r_chan_sel = CSRStorage(flen(self.bank_o.sel))
self._r_oe = CSR()
self._r_o_timestamp = CSRStorage(counter_width+fine_ts_width)
self._r_o_value = CSRStorage(2)
self._r_o_writable = CSRStatus()
self._r_o_we = CSR()
self._r_o_underflow = CSRStatus()
self._r_o_level = CSRStatus(bits_for(ofifo_depth))
self._r_i_timestamp = CSRStatus(counter_width+fine_ts_width)
self._r_i_value = CSRStatus()
self._r_i_readable = CSRStatus()
self._r_i_re = CSR()
self._r_i_overflow = CSRStatus()
# OE
oes = []
for n, chif in enumerate(phy.rbus):
if hasattr(chif, "oe"):
self.sync += \
If(self._r_oe.re & (self._r_chan_sel.storage == n),
chif.oe.eq(self._r_oe.r)
)
oes.append(chif.oe)
else:
oes.append(1)
self.comb += self._r_oe.w.eq(Array(oes)[self._r_chan_sel.storage])
# Output/Gate
self.comb += [
self.bank_o.reset.eq(self._r_reset.storage),
self.bank_o.sel.eq(self._r_chan_sel.storage),
self.bank_o.timestamp.eq(self._r_o_timestamp.storage),
self.bank_o.value.eq(self._r_o_value.storage),
self._r_o_writable.status.eq(self.bank_o.writable),
self.bank_o.we.eq(self._r_o_we.re),
self._r_o_underflow.status.eq(self.bank_o.underflow),
self._r_o_level.status.eq(self.bank_o.level)
]
# Input
self.comb += [
self.bank_i.reset.eq(self._r_reset.storage),
self.bank_i.sel.eq(self._r_chan_sel.storage),
self._r_i_timestamp.status.eq(self.bank_i.timestamp),
self._r_i_value.status.eq(self.bank_i.value),
self._r_i_readable.status.eq(self.bank_i.readable),
self.bank_i.re.eq(self._r_i_re.re),
self._r_i_overflow.status.eq(self.bank_i.overflow)
]