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drtio: add repeater input support

pull/1212/head
Sebastien Bourdeauducq 2018-09-17 23:45:27 +08:00
parent c33f74dabe
commit 2b44786f73
2 changed files with 158 additions and 6 deletions
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102
artiq/gateware/drtio/rt_packet_repeater.py
View File

@ -103,6 +103,61 @@ class RTPacketRepeater(Module):
timeout_counter = ClockDomainsRenamer("rtio")(WaitTimer(8191))
self.submodules += timeout_counter
# Read
rb_chan_sel = Signal(24)
rb_timeout = Signal(64)
self.sync.rtio += If(self.cri.cmd == cri.commands["read"],
rb_chan_sel.eq(self.cri.chan_sel),
rb_timeout.eq(self.cri.timestamp))
read_not = Signal()
read_no_event = Signal()
read_is_overflow = Signal()
read_data = Signal(32)
read_timestamp = Signal(64)
rtio_read_not = Signal()
rtio_read_not_ack = Signal()
rtio_read_no_event = Signal()
rtio_read_is_overflow = Signal()
rtio_read_data = Signal(32)
rtio_read_timestamp = Signal(64)
self.submodules += CrossDomainNotification("rtio_rx", "rtio",
read_not,
Cat(read_no_event, read_is_overflow, read_data, read_timestamp),
rtio_read_not, rtio_read_not_ack,
Cat(rtio_read_no_event, rtio_read_is_overflow,
rtio_read_data, rtio_read_timestamp))
self.comb += [
read_is_overflow.eq(rx_dp.packet_as["read_reply_noevent"].overflow),
read_data.eq(rx_dp.packet_as["read_reply"].data),
read_timestamp.eq(rx_dp.packet_as["read_reply"].timestamp)
]
# input status
i_status_wait_event = Signal()
i_status_overflow = Signal()
i_status_wait_status = Signal()
self.comb += self.cri.i_status.eq(Cat(
i_status_wait_event, i_status_overflow, i_status_wait_status))
load_read_reply = Signal()
self.sync.rtio += [
If(load_read_reply,
i_status_wait_event.eq(0),
i_status_overflow.eq(0),
If(rtio_read_no_event,
If(rtio_read_is_overflow,
i_status_overflow.eq(1)
).Else(
i_status_wait_event.eq(1)
)
),
self.cri.i_data.eq(rtio_read_data),
self.cri.i_timestamp.eq(rtio_read_timestamp)
)
]
# Missed commands
cri_ready = Signal()
self.sync.rtio += [
@ -111,7 +166,7 @@ class RTPacketRepeater(Module):
self.command_missed_cmd.eq(self.cri.cmd)
]
# TX FSM
# TX and CRI FSM
tx_fsm = ClockDomainsRenamer("rtio")(FSM(reset_state="IDLE"))
self.submodules += tx_fsm
@ -126,9 +181,11 @@ class RTPacketRepeater(Module):
).Else(
cri_ready.eq(1),
If(self.cri.cmd == cri.commands["write"], NextState("WRITE")),
If(self.cri.cmd == cri.commands["get_buffer_space"], NextState("BUFFER_SPACE"))
If(self.cri.cmd == cri.commands["get_buffer_space"], NextState("BUFFER_SPACE")),
If(self.cri.cmd == cri.commands["read"], NextState("READ"))
)
)
tx_fsm.act("SET_TIME",
tx_dp.send("set_time", timestamp=tsc_value),
If(tx_dp.packet_last,
@ -136,6 +193,7 @@ class RTPacketRepeater(Module):
NextState("IDLE")
)
)
tx_fsm.act("WRITE",
tx_dp.send("write",
timestamp=wb_timestamp,
@ -158,26 +216,46 @@ class RTPacketRepeater(Module):
NextState("IDLE")
)
)
tx_fsm.act("BUFFER_SPACE",
tx_dp.send("buffer_space_request", destination=self.buffer_space_destination),
If(tx_dp.packet_last,
buffer_space_not_ack.eq(1),
NextState("WAIT_BUFFER_SPACE")
NextState("GET_BUFFER_SPACE_REPLY")
)
)
tx_fsm.act("WAIT_BUFFER_SPACE",
tx_fsm.act("GET_BUFFER_SPACE_REPLY",
timeout_counter.wait.eq(1),
If(timeout_counter.done,
self.err_buffer_space_timeout.eq(1),
NextState("IDLE")
NextState("READY")
).Else(
If(buffer_space_not,
self.cri.o_buffer_space_valid.eq(1),
NextState("IDLE")
NextState("READY")
),
)
)
tx_fsm.act("READ",
i_status_wait_status.eq(1),
tx_dp.send("read_request",
chan_sel=rb_chan_sel,
timeout=rb_timeout),
rtio_read_not_ack.eq(1),
If(tx_dp.packet_last,
NextState("GET_READ_REPLY")
)
)
tx_fsm.act("GET_READ_REPLY",
i_status_wait_status.eq(1),
rtio_read_not_ack.eq(1),
If(rtio_read_not,
load_read_reply.eq(1),
NextState("READY")
)
)
# RX FSM
rx_fsm = ClockDomainsRenamer("rtio_rx")(FSM(reset_state="INPUT"))
self.submodules += rx_fsm
@ -192,6 +270,8 @@ class RTPacketRepeater(Module):
If(rx_dp.packet_last,
Case(rx_dp.packet_type, {
rx_plm.types["buffer_space_reply"]: NextState("BUFFER_SPACE"),
rx_plm.types["read_reply"]: NextState("READ_REPLY"),
rx_plm.types["read_reply_noevent"]: NextState("READ_REPLY_NOEVENT"),
"default": self.err_unknown_packet_type.eq(1)
})
).Else(
@ -207,3 +287,13 @@ class RTPacketRepeater(Module):
rx_buffer_space.eq(rx_dp.packet_as["buffer_space_reply"].space),
NextState("INPUT")
)
rx_fsm.act("READ_REPLY",
read_not.eq(1),
read_no_event.eq(0),
NextState("INPUT")
)
rx_fsm.act("READ_REPLY_NOEVENT",
read_not.eq(1),
read_no_event.eq(1),
NextState("INPUT")
)

62
artiq/gateware/test/drtio/test_rt_packet_repeater.py
View File

@ -128,3 +128,65 @@ class TestRepeater(unittest.TestCase):
current_request = field_dict["destination"]
run_simulation(dut, [send_requests(), send_replies(), pr.receive(receive)])
def test_input(self):
for nwords in range(1, 8):
pt, pr, ts, dut = create_dut(nwords)
def read(chan_sel, timeout):
yield dut.cri.chan_sel.eq(chan_sel)
yield dut.cri.timestamp.eq(timeout)
yield dut.cri.cmd.eq(cri.commands["read"])
yield
yield dut.cri.cmd.eq(cri.commands["nop"])
yield
status = yield dut.cri.i_status
while status & 4:
yield
status = yield dut.cri.i_status
if status & 0x1:
return "timeout"
if status & 0x2:
return "overflow"
if status & 0x8:
return "destination unreachable"
return ((yield dut.cri.i_data),
(yield dut.cri.i_timestamp))
def send_requests():
for timeout in range(20, 200000, 100000):
for chan_sel in range(3):
data, timestamp = yield from read(chan_sel, timeout)
self.assertEqual(data, chan_sel*2)
self.assertEqual(timestamp, timeout//2)
i2 = yield from read(10, 400000)
self.assertEqual(i2, "timeout")
i3 = yield from read(11, 400000)
self.assertEqual(i3, "overflow")
current_request = None
@passive
def send_replies():
nonlocal current_request
while True:
while current_request is None:
yield
chan_sel, timeout = current_request
if chan_sel == 10:
yield from pt.send("read_reply_noevent", overflow=0)
elif chan_sel == 11:
yield from pt.send("read_reply_noevent", overflow=1)
else:
yield from pt.send("read_reply", data=chan_sel*2, timestamp=timeout//2)
current_request = None
def receive(packet_type, field_dict, trailer):
nonlocal current_request
self.assertEqual(packet_type, "read_request")
self.assertEqual(trailer, [])
self.assertEqual(current_request, None)
current_request = (field_dict["chan_sel"], field_dict["timeout"])
run_simulation(dut, [send_requests(), send_replies(), pr.receive(receive)])