def __init__(self, lane_count, seqn_width, layout_fifo_payload, layout_output_network_payload):
self.input = [Record(layouts.fifo_egress(seqn_width, layout_fifo_payload))
for _ in range(lane_count)]
self.output = [Record(layouts.output_network_node(seqn_width, layout_output_network_payload),
reset_less=True)
for _ in range(lane_count)]
if hasattr(self.output[0].payload, "fine_ts"):
glbl_fine_ts_width = len(self.output[0].payload.fine_ts)
else:
glbl_fine_ts_width = 0
self.coarse_timestamp = Signal(64-glbl_fine_ts_width)
# # #
for input, output in zip(self.input, self.output):
for field, _ in output.payload.layout:
if field == "fine_ts":
self.sync += output.payload.fine_ts.eq(input.payload.timestamp[:glbl_fine_ts_width])
else:
self.sync += getattr(output.payload, field).eq(getattr(input.payload, field))
self.sync += output.seqn.eq(input.seqn)
self.comb += [
output.replace_occured.eq(0),
output.nondata_replace_occured.eq(0)
]
self.comb += input.re.eq(input.payload.timestamp[glbl_fine_ts_width:] == self.coarse_timestamp)
output.valid.reset_less = False
self.sync += output.valid.eq(input.re & input.readable)
def __init__(self,
lane_count,
fifo_depth,
layout_payload,
mode,
report_buffer_space=False):
seqn_width = layouts.seqn_width(lane_count, fifo_depth)
self.input = [
Record(layouts.fifo_ingress(seqn_width, layout_payload))
for _ in range(lane_count)
]
self.output = [
Record(layouts.fifo_egress(seqn_width, layout_payload))
for _ in range(lane_count)
]
if report_buffer_space:
self.buffer_space = Signal(max=fifo_depth + 1)
# # #
if mode == "sync":
fifo_cls = SyncFIFOBuffered
elif mode == "async":
fifo_cls = AsyncFIFOBuffered
else:
raise ValueError
fifos = []
for input, output in zip(self.input, self.output):
fifo = fifo_cls(seqn_width + layout_len(layout_payload),
fifo_depth)
self.submodules += fifo
fifos.append(fifo)
self.comb += [
fifo.din.eq(Cat(input.seqn, input.payload.raw_bits())),
fifo.we.eq(input.we),
input.writable.eq(fifo.writable),
Cat(output.seqn, output.payload.raw_bits()).eq(fifo.dout),
output.readable.eq(fifo.readable),
fifo.re.eq(output.re)
]
if report_buffer_space:
if mode != "sync":
raise NotImplementedError
def compute_max(elts):
l = len(elts)
if l == 1:
return elts[0], 0
else:
maximum1, latency1 = compute_max(elts[:l // 2])
maximum2, latency2 = compute_max(elts[l // 2:])
maximum = Signal(max(len(maximum1), len(maximum2)))
self.sync += [
If(maximum1 > maximum2,
maximum.eq(maximum1)).Else(maximum.eq(maximum2))
]
latency = max(latency1, latency2) + 1
return maximum, latency
max_level, latency = compute_max([fifo.level for fifo in fifos])
max_level_valid = Signal()
max_level_valid_counter = Signal(max=latency)
self.sync += [
If(reduce(or_, [fifo.we for fifo in fifos]),
max_level_valid.eq(0),
max_level_valid_counter.eq(latency - 1)).Elif(
max_level_valid_counter == 0,
max_level_valid.eq(1)).Else(
max_level_valid_counter.eq(max_level_valid_counter -
1))
]
self.comb += If(max_level_valid,
self.buffer_space.eq(fifo_depth - max_level))
def __init__(self, lane_count, fifo_depth, layout_payload, mode, report_buffer_space=False):
seqn_width = layouts.seqn_width(lane_count, fifo_depth)
self.input = [Record(layouts.fifo_ingress(seqn_width, layout_payload))
for _ in range(lane_count)]
self.output = [Record(layouts.fifo_egress(seqn_width, layout_payload))
for _ in range(lane_count)]
if report_buffer_space:
self.buffer_space = Signal(max=fifo_depth+1)
# # #
if mode == "sync":
fifo_cls = SyncFIFOBuffered
elif mode == "async":
fifo_cls = AsyncFIFOBuffered
else:
raise ValueError
fifos = []
for input, output in zip(self.input, self.output):
fifo = fifo_cls(seqn_width + layout_len(layout_payload), fifo_depth)
self.submodules += fifo
fifos.append(fifo)
self.comb += [
fifo.din.eq(Cat(input.seqn, input.payload.raw_bits())),
fifo.we.eq(input.we),
input.writable.eq(fifo.writable),
Cat(output.seqn, output.payload.raw_bits()).eq(fifo.dout),
output.readable.eq(fifo.readable),
fifo.re.eq(output.re)
]
if report_buffer_space:
if mode != "sync":
raise NotImplementedError
def compute_max(elts):
l = len(elts)
if l == 1:
return elts[0], 0
else:
maximum1, latency1 = compute_max(elts[:l//2])
maximum2, latency2 = compute_max(elts[l//2:])
maximum = Signal(max(len(maximum1), len(maximum2)))
self.sync += [
If(maximum1 > maximum2,
maximum.eq(maximum1)
).Else(
maximum.eq(maximum2)
)
]
latency = max(latency1, latency2) + 1
return maximum, latency
max_level, latency = compute_max([fifo.level for fifo in fifos])
max_level_valid = Signal()
max_level_valid_counter = Signal(max=latency)
self.sync += [
If(reduce(or_, [fifo.we for fifo in fifos]),
max_level_valid.eq(0),
max_level_valid_counter.eq(latency - 1)
).Elif(max_level_valid_counter == 0,
max_level_valid.eq(1)
).Else(
max_level_valid_counter.eq(max_level_valid_counter - 1)
)
]
self.comb += If(max_level_valid, self.buffer_space.eq(fifo_depth - max_level))