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rtio: collapse zero-length intervals

This commit is contained in:
Sebastien Bourdeauducq 2014-09-10 21:21:02 +08:00
parent 7e889b014d
commit a158b87d9f
1 changed files with 13 additions and 11 deletions
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24
soc/artiqlib/rtio/core.py
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@ -14,7 +14,6 @@ class _RTIOBankO(Module):
self.writable = Signal()
self.we = Signal()
self.underflow = Signal()
self.pileup = Signal()
self.level = Signal(bits_for(fifo_depth))
# # #
@ -29,16 +28,19 @@ class _RTIOBankO(Module):
self.comb += we_filtered.eq(self.we & (self.value != prev_value))
self.sync += If(self.we & self.writable, prev_value.eq(self.value))
# detect underflows and pileups
# collapse zero-length intervals
replace = Signal()
prev_ts_coarse = Signal(counter_width)
ts_coarse = self.timestamp[fine_ts_width:]
self.sync += If(we_filtered & self.writable,
prev_ts_coarse.eq(self.timestamp[fine_ts_width:]))
self.comb += replace.eq(
self.timestamp[fine_ts_width:] == prev_ts_coarse)
# detect underflows
self.sync += \
If(we_filtered & self.writable,
If(ts_coarse < counter + 2,
self.underflow.eq(1)),
If(ts_coarse == prev_ts_coarse,
self.pileup.eq(1)),
prev_ts_coarse.eq(ts_coarse)
If(self.timestamp[fine_ts_width:] < counter + 2,
self.underflow.eq(1))
)
fifos = []
@ -53,7 +55,8 @@ class _RTIOBankO(Module):
self.comb += [
fifo.din.timestamp.eq(self.timestamp),
fifo.din.value.eq(self.value),
fifo.we.eq(we_filtered & (self.sel == n))
fifo.we.eq(we_filtered & (self.sel == n)),
fifo.replace.eq(replace)
]
# FIFO read
@ -201,8 +204,7 @@ class RTIO(Module, AutoCSR):
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_error.status.eq(
Cat(self.bank_o.underflow, self.bank_o.pileup)),
self._r_o_error.status.eq(self.bank_o.underflow),
self._r_o_level.status.eq(self.bank_o.level)
]