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sawg: use ParallelHBFCascade to AA [WIP]

This commit is contained in:
Robert Jördens 2016-12-08 15:32:57 +01:00
parent a629eb1665
commit 3eef6229cc
1 changed files with 17 additions and 10 deletions
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19
artiq/gateware/dsp/sawg.py
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@ -4,9 +4,10 @@ from migen import *
from misoc.interconnect.stream import Endpoint
from misoc.cores.cordic import Cordic
from .accu import PhasedAccu, Accu
from .accu import PhasedAccu
from .tools import eqh, Delay, SatAddMixin
from .spline import Spline
from .fir import ParallelHBFUpsampler, halfgen4_cascade
_Widths = namedtuple("_Widths", "t a p f")
@ -145,13 +146,17 @@ class Channel(Module, SatAddMixin):
self.submodules.a1 = a1 = SplineParallelDDS(widths, orders)
self.submodules.a2 = a2 = SplineParallelDDS(widths, orders)
coeff = [[int(round((1 << 26) * ci)) for ci in c]
for c in halfgen4_cascade(parallelism, width=.4, order=8)]
hbf = [ParallelHBFUpsampler(coeff, width=width, shift=25)
for i in range(2)]
self.submodules.b = b = SplineParallelDUC(
widths._replace(a=len(a1.xo[0]), f=widths.f - width), orders,
parallelism=parallelism, a_delay=-a1.latency)
parallelism=parallelism, a_delay=-a1.latency-hbf[0].latency)
cfg = Config(widths.a)
u = Spline(width=widths.a, order=orders.a)
du = Delay(width, a1.latency + b.latency - u.latency)
self.submodules += cfg, u, du
du = Delay(width, a1.latency + hbf[0].latency + b.latency - u.latency)
self.submodules += cfg, u, du, hbf
self.u = u.tri(widths.t)
self.i = [cfg.i, self.u, a1.a, a1.f, a1.p, a2.a, a2.f, a2.p, b.f, b.p]
self.i_names = "cfg u a1 f1 p1 a2 f2 p2 f0 p0".split()
@ -174,12 +179,14 @@ class Channel(Module, SatAddMixin):
Cat(a1.clr, a2.clr, b.clr).eq(cfg.clr),
]
self.sync += [
b.i.x.eq(self.sat_add(a1.xo[0], a2.xo[0],
hbf[0].i.eq(self.sat_add(a1.xo[0], a2.xo[0],
limits=cfg.limits[0],
clipped=cfg.clipped[0])),
b.i.y.eq(self.sat_add(a1.yo[0], a2.yo[0],
hbf[1].i.eq(self.sat_add(a1.yo[0], a2.yo[0],
limits=cfg.limits[1],
clipped=cfg.clipped[1])),
b.i.x.eq(hbf[0].o[0]), # FIXME: rip up
b.i.y.eq(hbf[1].o[0]),
eqh(du.i, u.o.a0),
]
# wire up outputs and q_{i,o} exchange