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drtio: collision/replace fixes

This commit is contained in:
Sebastien Bourdeauducq 2017-04-06 16:33:49 +08:00
parent 83d87b5805
commit 729e7b52f0
1 changed files with 14 additions and 10 deletions
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24
artiq/gateware/drtio/rt_ios_satellite.py
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@ -50,6 +50,9 @@ class IOS(Module):
we = Signal()
self.comb += we.eq(rt_packet.write_stb
& (rt_packet.write_channel == n))
write_timestamp = rt_packet.write_timestamp[max_fine_ts_width-fine_ts_width:]
write_timestamp_coarse = rt_packet.write_timestamp[max_fine_ts_width:]
write_timestamp_fine = rt_packet.write_timestamp[max_fine_ts_width-fine_ts_width:max_fine_ts_width]
# latency compensation
if interface.delay:
@ -89,11 +92,10 @@ class IOS(Module):
if interface.enable_replace:
# Note: replace may be asserted at the same time as collision
# when addresses are different. In that case, it is a collision.
self.sync.rio += replace.eq(rt_packet.write_timestamp == buf.timestamp)
# Detect sequence errors on coarse timestamps only
# so that they are mutually exclusive with collision errors.
self.sync.rio += sequence_error.eq(rt_packet.write_timestamp[fine_ts_width:] <
buf.timestamp[fine_ts_width:])
self.sync.rio += replace.eq(write_timestamp == buf.timestamp)
# Detect sequence errors on coarse timestamps only
# so that they are mutually exclusive with collision errors.
self.sync.rio += sequence_error.eq(write_timestamp_coarse < buf.timestamp[fine_ts_width:])
if interface.enable_replace:
if address_width:
different_addresses = rt_packet.write_address != buf.address
@ -101,12 +103,15 @@ class IOS(Module):
different_addresses = 0
if fine_ts_width:
self.sync.rio += collision.eq(
(rt_packet.write_timestamp[fine_ts_width:] == buf.timestamp[fine_ts_width:])
& ((rt_packet.write_timestamp[:fine_ts_width] != buf.timestamp[:fine_ts_width])
(write_timestamp_coarse == buf.timestamp[fine_ts_width:])
& ((write_timestamp_fine != buf.timestamp[:fine_ts_width])
|different_addresses))
else:
self.sync.rio += collision.eq(
(write_timestamp == buf.timestamp) & different_addresses)
else:
self.sync.rio += collision.eq(
rt_packet.write_timestamp[fine_ts_width:] == buf.timestamp[fine_ts_width:])
write_timestamp_coarse == buf.timestamp[fine_ts_width:])
self.comb += any_error.eq(sequence_error | collision)
self.sync.rio += [
If(we & sequence_error, self.write_sequence_error.eq(1)),
@ -142,8 +147,7 @@ class IOS(Module):
If(we & ~any_error,
buf_just_written.eq(1),
buf_pending.eq(1),
buf.timestamp.eq(
rt_packet.write_timestamp[max_fine_ts_width-fine_ts_width:]),
buf.timestamp.eq(write_timestamp),
buf.data.eq(rt_packet.write_data) if data_width else [],
buf.address.eq(rt_packet.write_address) if address_width else [],
),