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sawg: wir up limiting, saturating addition

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This commit is contained in:
Robert Jördens 2016-11-19 15:53:33 +01:00
parent e53d0bcd5b
commit 04813ea29b
1 changed files with 17 additions and 11 deletions
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28
artiq/gateware/dsp/sawg.py
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@ -104,10 +104,11 @@ class Config(Module):
def __init__(self, width):
self.clr = Signal(4, reset=0b1111)
self.iq_en = Signal(2, reset=0b01)
self.limit = [[Signal((width, True), reset=-(1 << width - 1)),
self.limits = [[Signal((width, True), reset=-(1 << width - 1)),
Signal((width, True), reset=(1 << width - 1) - 1)]
for i in range(2)]
self.i = Endpoint([("addr", bits_for(4 + 2*len(self.limit))),
for i in range(3)]
self.clipped = [Signal(2) for i in range(3)] # TODO
self.i = Endpoint([("addr", bits_for(4 + len(self.limits))),
("data", 16)])
self.ce = Signal()
@ -118,7 +119,7 @@ class Config(Module):
pad = Signal()
reg = Array([Cat(div, n), self.clr, self.iq_en, pad] +
sum(self.limit, []))
[Cat(*l) for l in self.limits])
self.comb += [
self.i.ack.eq(1),
@ -161,7 +162,7 @@ class Channel(Module, SatAddMixin):
self.widths = widths
self.orders = orders
self.parallelism = parallelism
self.latency = a1.latency + b.latency + 1
self.latency = a1.latency + b.latency + 2
self.cordic_gain = a1.gain*b.gain
###
@ -172,17 +173,22 @@ class Channel(Module, SatAddMixin):
b.ce.eq(cfg.ce),
u.o.ack.eq(cfg.ce),
Cat(a1.clr, a2.clr, b.clr).eq(cfg.clr),
b.i.x.eq(self.sat_add([a1.xo[0], a2.xo[0]])),
b.i.y.eq(self.sat_add([a1.yo[0], a2.yo[0]])),
]
self.sync += [
b.i.x.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],
limits=cfg.limits[1],
clipped=cfg.clipped[1])),
eqh(du.i, u.o.a0),
]
# wire up outputs and q_{i,o} exchange
for o, x, y in zip(self.o, b.xo, self.y_in):
self.sync += [
o.eq(self.sat_add([
du.o,
Mux(cfg.iq_en[0], x, 0),
Mux(cfg.iq_en[1], y, 0)])),
o.eq(self.sat_add(
du.o, Mux(cfg.iq_en[0], x, 0), Mux(cfg.iq_en[1], y, 0),
limits=cfg.limits[2], clipped=cfg.clipped[2])),
]
def connect_y(self, buddy):