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drtio: fifo level -> fifo space

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This commit is contained in:
Sebastien Bourdeauducq 2016-10-24 15:59:12 +08:00
parent aa8e211735
commit 83bec06226
2 changed files with 44 additions and 42 deletions
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6
artiq/gateware/drtio/iot.py
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@ -41,9 +41,9 @@ class IOT(Module):
# FIFO level
self.sync += \
If(rt_packets.fifo_level_update &
(rt_packets.fifo_level_channel == n),
rt_packets.fifo_level.eq(fifo.level))
If(rt_packets.fifo_space_update &
(rt_packets.fifo_space_channel == n),
rt_packets.fifo_space.eq(channel.ofifo_depth - fifo.level))
# FIFO write
self.comb += fifo.we.eq(rt_packets.write_stb)

80
artiq/gateware/drtio/rt_packets.py
View File

@ -37,7 +37,7 @@ def get_m2s_layouts(alignment):
("address", 16),
("data_len", 8),
("short_data", 8))
plm.add_type("fifo_level_request", ("channel", 16))
plm.add_type("fifo_space_request", ("channel", 16))
return plm
@ -45,7 +45,7 @@ def get_s2m_layouts(alignment):
plm = PacketLayoutManager(alignment)
plm.add_type("error", ("code", 8))
plm.add_type("echo_reply")
plm.add_type("fifo_level_reply", ("level", 16))
plm.add_type("fifo_space_reply", ("space", 16))
return plm
@ -176,9 +176,9 @@ class RTPacketSatellite(Module):
self.tsc_load = Signal()
self.tsc_value = Signal(64)
self.fifo_level_channel = Signal(16)
self.fifo_level_update = Signal()
self.fifo_level = Signal(16)
self.fifo_space_channel = Signal(16)
self.fifo_space_update = Signal()
self.fifo_space = Signal(16)
self.write_stb = Signal()
self.write_timestamp = Signal(64)
@ -210,14 +210,14 @@ class RTPacketSatellite(Module):
err_set = Signal()
err_req = Signal()
err_ack = Signal()
fifo_level_set = Signal()
fifo_level_req = Signal()
fifo_level_ack = Signal()
fifo_space_set = Signal()
fifo_space_req = Signal()
fifo_space_ack = Signal()
self.sync += [
If(err_ack, err_req.eq(0)),
If(err_set, err_req.eq(1)),
If(fifo_level_ack, fifo_level_req.eq(0)),
If(fifo_level_set, fifo_level_req.eq(1)),
If(fifo_space_ack, fifo_space_req.eq(0)),
If(fifo_space_set, fifo_space_req.eq(1)),
]
err_code = Signal(max=len(error_codes)+1)
@ -225,8 +225,8 @@ class RTPacketSatellite(Module):
self.comb += [
self.tsc_value.eq(
rx_dp.packet_as["set_time"].timestamp),
self.fifo_level_channel.eq(
rx_dp.packet_as["fifo_level_request"].channel),
self.fifo_space_channel.eq(
rx_dp.packet_as["fifo_space_request"].channel),
self.write_timestamp.eq(
rx_dp.packet_as["write"].timestamp),
self.write_channel.eq(
@ -250,8 +250,8 @@ class RTPacketSatellite(Module):
rx_plm.types["echo_request"]: echo_req.eq(1),
rx_plm.types["set_time"]: NextState("SET_TIME"),
rx_plm.types["write"]: NextState("WRITE"),
rx_plm.types["fifo_level_request"]:
NextState("FIFO_LEVEL"),
rx_plm.types["fifo_space_request"]:
NextState("FIFO_SPACE"),
"default": [
err_set.eq(1),
NextValue(err_code, error_codes["unknown_type"])]
@ -267,9 +267,9 @@ class RTPacketSatellite(Module):
self.write_stb.eq(1),
NextState("INPUT")
)
rx_fsm.act("FIFO_LEVEL",
fifo_level_set.eq(1),
self.fifo_level_update.eq(1),
rx_fsm.act("FIFO_SPACE",
fifo_space_set.eq(1),
self.fifo_space_update.eq(1),
NextState("INPUT")
)
@ -279,7 +279,7 @@ class RTPacketSatellite(Module):
tx_fsm.act("IDLE",
If(echo_req, NextState("ECHO")),
If(fifo_level_req, NextState("FIFO_LEVEL")),
If(fifo_space_req, NextState("FIFO_SPACE")),
If(self.write_overflow, NextState("ERROR_WRITE_OVERFLOW")),
If(self.write_underflow, NextState("ERROR_WRITE_UNDERFLOW")),
If(err_req, NextState("ERROR"))
@ -289,9 +289,9 @@ class RTPacketSatellite(Module):
tx_dp.stb.eq(1),
If(tx_dp.done, NextState("IDLE"))
)
tx_fsm.act("FIFO_LEVEL",
fifo_level_ack.eq(1),
tx_dp.send("fifo_level_reply", level=self.fifo_level),
tx_fsm.act("FIFO_SPACE",
fifo_space_ack.eq(1),
tx_dp.send("fifo_space_reply", space=self.fifo_space),
tx_dp.stb.eq(1),
If(tx_dp.done, NextState("IDLE"))
)
@ -378,12 +378,12 @@ class RTPacketMaster(Module):
self.write_address = Signal(16)
self.write_data = Signal(256)
# fifo level interface
# write with timestamp[48:] == 0xffff to make a fifo level request
# (level requests have to be ordered wrt writes)
self.fifo_level_not = Signal()
self.fifo_level_not_ack = Signal()
self.fifo_level = Signal(16)
# fifo space interface
# write with timestamp[48:] == 0xffff to make a fifo space request
# (space requests have to be ordered wrt writes)
self.fifo_space_not = Signal()
self.fifo_space_not_ack = Signal()
self.fifo_space = Signal(16)
# echo interface
self.echo_stb = Signal()
@ -394,7 +394,9 @@ class RTPacketMaster(Module):
# set_time interface
self.set_time_stb = Signal()
self.set_time_ack = Signal()
self.tsc_value = Signal(64) # in rtio domain, must be valid all time
# in rtio domain, must be valid all time while there is
# a set_time request pending
self.tsc_value = Signal(64)
# errors
self.error_not = Signal()
@ -419,11 +421,11 @@ class RTPacketMaster(Module):
write_address, write_data).eq(fifo.dout)
]
fifo_level_not = Signal()
fifo_level = Signal(16)
fifo_space_not = Signal()
fifo_space = Signal(16)
self.submodules += _CrossDomainNotification("rtio_rx",
fifo_level_not, fifo_level,
self.fifo_level_not, self.fifo_level_not_ack, self.fifo_level)
fifo_space_not, fifo_space,
self.fifo_space_not, self.fifo_space_not_ack, self.fifo_space)
set_time_stb = Signal()
set_time_ack = Signal()
@ -474,7 +476,7 @@ class RTPacketMaster(Module):
short_data=write_data),
If(wfifo.readable,
If(write_timestamp[48:] == 0xffff,
NextState("FIFO_LEVEL")
NextState("FIFO_SPACE")
).Else(
tx_dp.stb.eq(1),
wfifo.re.eq(tx_dp.done)
@ -489,8 +491,8 @@ class RTPacketMaster(Module):
)
)
)
tx_fsm.act("FIFO_LEVEL",
tx_dp.send("fifo_level_request", channel=write_channel),
tx_fsm.act("FIFO_SPACE",
tx_dp.send("fifo_space_request", channel=write_channel),
tx_dp.stb.eq(1),
If(tx_dp.done, NextState("IDLE_WRITE"))
)
@ -519,7 +521,7 @@ class RTPacketMaster(Module):
Case(rx_dp.packet_type, {
rx_plm.types["error"]: NextState("ERROR"),
rx_plm.types["echo_reply"]: echo_received_now.eq(1),
rx_plm.types["fifo_level_reply"]: NextState("FIFO_LEVEL"),
rx_plm.types["fifo_space_reply"]: NextState("FIFO_SPACE"),
"default": [
error_not.eq(1),
error_code.eq(error_codes["unknown_type"])
@ -533,8 +535,8 @@ class RTPacketMaster(Module):
error_code.eq(rx_dp.packet_as["error"].code),
NextState("INPUT")
)
rx_fsm.act("FIFO_LEVEL",
fifo_level_not.eq(1),
fifo_level.eq(rx_dp.packet_as["fifo_level_reply"].level),
rx_fsm.act("FIFO_SPACE",
fifo_space_not.eq(1),
fifo_space.eq(rx_dp.packet_as["fifo_space_reply"].space),
NextState("INPUT")
)