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drtio: fix transmit datapath with transceiver width > max packet width

This commit is contained in:
Sebastien Bourdeauducq 2016-11-27 13:19:12 +08:00
parent b2450c7c56
commit 046b8bfd33
1 changed files with 24 additions and 12 deletions
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36
artiq/gateware/drtio/rt_packets.py
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@ -140,7 +140,7 @@ class TransmitDatapath(Module):
self.packet_buffer = Signal(max(layout_len(l)
for l in plm.layouts.values()))
w_in_packet = len(self.packet_buffer)//ws
self.packet_last_n = Signal(max=w_in_packet)
self.packet_last_n = Signal(max=max(w_in_packet, 2))
self.packet_stb = Signal()
self.packet_last = Signal()
@ -149,18 +149,30 @@ class TransmitDatapath(Module):
# # #
packet_buffer_count = Signal(max=w_in_packet)
self.comb += self.packet_last.eq(packet_buffer_count == self.packet_last_n)
self.sync += frame.eq(0)
if w_in_packet > 1:
packet_buffer_count = Signal(max=w_in_packet)
self.comb += self.packet_last.eq(packet_buffer_count == self.packet_last_n)
self.sync += [
packet_buffer_count.eq(0),
If(self.packet_stb,
frame.eq(1),
Case(packet_buffer_count,
{i: data.eq(self.packet_buffer[i*ws:(i+1)*ws])
for i in range(w_in_packet)}),
packet_buffer_count.eq(packet_buffer_count + 1)
)
]
else:
self.comb += self.packet_last.eq(1)
self.sync += \
If(self.packet_stb,
frame.eq(1),
data.eq(self.packet_buffer)
)
self.sync += [
frame.eq(0),
packet_buffer_count.eq(0),
If(self.packet_stb,
frame.eq(1),
Case(packet_buffer_count,
{i: data.eq(self.packet_buffer[i*ws:(i+1)*ws])
for i in range(w_in_packet)}),
packet_buffer_count.eq(packet_buffer_count + 1)
),
If(self.raw_stb,
frame.eq(1),
data.eq(self.raw_data)