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dds monitor: relax timing (for pipistrello)

This commit is contained in:
Robert Jördens 2015-07-19 21:36:51 -06:00
parent 1a0dc499dd
commit 47191eda91
1 changed files with 22 additions and 21 deletions
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39
artiq/gateware/rtio/phy/dds.py
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@ -14,39 +14,40 @@ class _AD9xxx(Module):
# # #
# buffer the current address/data on the rtlink output
current_address = Signal.like(self.rtlink.o.address)
current_data = Signal.like(self.rtlink.o.data)
self.sync.rio += If(self.rtlink.o.stb,
current_address.eq(self.rtlink.o.address),
current_data.eq(self.rtlink.o.data))
# keep track of the currently selected channel
current_channel = Signal(max=nchannels)
self.sync.rio += If(self.rtlink.o.stb &
(self.rtlink.o.address == 2**flen(pads.a)+1),
current_channel.eq(self.rtlink.o.data))
self.sync.rio += If(current_address == 2**flen(pads.a) + 1,
current_channel.eq(current_data))
# keep track of frequency tuning words, before they are FUDed
ftws = [Signal(32) for i in range(nchannels)]
for c, ftw in enumerate(ftws):
if flen(pads.d) == 8:
for i in range(4):
self.sync.rio += \
If(self.rtlink.o.stb & \
(self.rtlink.o.address == ftw_base+i) & \
(current_channel == c),
ftw[i*8:(i+1)*8].eq(self.rtlink.o.data)
)
If(current_channel == c, [
If(current_address == ftw_base+i,
ftw[i*8:(i+1)*8].eq(current_data))
for i in range(4)])
elif flen(pads.d) == 16:
for i in range(2):
self.sync.rio += \
If(self.rtlink.o.stb & \
(self.rtlink.o.address == ftw_base+2*i) & \
(current_channel == c),
ftw[i*16:(i+1)*16].eq(self.rtlink.o.data)
)
If(current_channel == c, [
If(current_address == ftw_base+2*i,
ftw[i*16:(i+1)*16].eq(current_data))
for i in range(2)])
else:
raise NotImplementedError
# FTW to probe on FUD
for c, (probe, ftw) in enumerate(zip(self.probes, ftws)):
fud = self.rtlink.o.stb & \
(self.rtlink.o.address == 2**flen(pads.a))
self.sync.rio += If(fud & (current_channel == c), probe.eq(ftw))
self.sync.rio += If(current_address == 2**flen(pads.a), [
If(current_channel == c, probe.eq(ftw))
for c, (probe, ftw) in enumerate(zip(self.probes, ftws))])
class AD9858(_AD9xxx):