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drtio: add buffering to repeater

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This commit is contained in:
Sebastien Bourdeauducq 2018-09-18 15:27:25 +08:00
parent 2b44786f73
commit eda15a596c
1 changed files with 66 additions and 38 deletions
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104
artiq/gateware/drtio/rt_packet_repeater.py
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@ -48,16 +48,57 @@ class RTPacketRepeater(Module):
tsc_value_load = Signal()
self.sync.rtio += If(tsc_value_load, tsc_value.eq(tsc.coarse_ts))
# Write buffer and extra data count
wb_timestamp = Signal(64)
wb_chan_sel = Signal(24)
wb_address = Signal(16)
wb_data = Signal(512)
self.sync.rtio += If(self.cri.cmd == cri.commands["write"],
wb_timestamp.eq(self.cri.timestamp),
wb_chan_sel.eq(self.cri.chan_sel),
wb_address.eq(self.cri.o_address),
wb_data.eq(self.cri.o_data))
# CRI buffer stage 1
cb0_loaded = Signal()
cb0_ack = Signal()
cb0_cmd = Signal(2)
cb0_timestamp = Signal(64)
cb0_chan_sel = Signal(24)
cb0_o_address = Signal(16)
cb0_o_data = Signal(512)
self.sync.rtio += [
If(cb0_ack,
cb0_loaded.eq(0),
cb0_cmd.eq(cri.commands["nop"])
),
If(~cb0_loaded & (self.cri.cmd != cri.commands["nop"]),
cb0_loaded.eq(1),
cb0_cmd.eq(self.cri.cmd),
cb0_timestamp.eq(self.cri.timestamp),
cb0_chan_sel.eq(self.cri.chan_sel),
cb0_o_address.eq(self.cri.o_address),
cb0_o_data.eq(self.cri.o_data)
),
self.err_command_missed.eq(cb0_loaded & (self.cri.cmd != cri.commands["nop"])),
self.command_missed_chan_sel.eq(self.cri.chan_sel),
self.command_missed_cmd.eq(self.cri.cmd)
]
# CRI buffer stage 2 and write data slicer
cb_loaded = Signal()
cb_ack = Signal()
cb_cmd = Signal(2)
cb_timestamp = Signal(64)
cb_chan_sel = Signal(24)
cb_o_address = Signal(16)
cb_o_data = Signal(512)
self.sync.rtio += [
If(cb_ack,
cb_loaded.eq(0),
cb_cmd.eq(cri.commands["nop"])
),
If(~cb_loaded & cb0_loaded,
cb_loaded.eq(1),
cb_cmd.eq(cb0_cmd),
cb_timestamp.eq(cb0_timestamp),
cb_chan_sel.eq(cb0_chan_sel),
cb_o_address.eq(cb0_o_address),
cb_o_data.eq(cb0_o_data)
)
]
self.comb += cb0_ack.eq(~cb_loaded)
wb_extra_data_cnt = Signal(8)
short_data_len = tx_plm.field_length("write", "short_data")
@ -104,12 +145,6 @@ class RTPacketRepeater(Module):
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()
@ -137,9 +172,8 @@ class RTPacketRepeater(Module):
# 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))
i_status_wait_event, i_status_overflow, cb0_loaded | cb_loaded))
load_read_reply = Signal()
self.sync.rtio += [
@ -158,14 +192,6 @@ class RTPacketRepeater(Module):
)
]
# Missed commands
cri_ready = Signal()
self.sync.rtio += [
self.err_command_missed.eq(~cri_ready & (self.cri.cmd != cri.commands["nop"])),
self.command_missed_chan_sel.eq(self.cri.chan_sel),
self.command_missed_cmd.eq(self.cri.cmd)
]
# TX and CRI FSM
tx_fsm = ClockDomainsRenamer("rtio")(FSM(reset_state="IDLE"))
self.submodules += tx_fsm
@ -179,10 +205,9 @@ class RTPacketRepeater(Module):
tsc_value_load.eq(1),
NextState("SET_TIME")
).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["read"], NextState("READ"))
If(cb_cmd == cri.commands["write"], NextState("WRITE")),
If(cb_cmd == cri.commands["get_buffer_space"], NextState("BUFFER_SPACE")),
If(cb_cmd == cri.commands["read"], NextState("READ"))
)
)
@ -196,13 +221,14 @@ class RTPacketRepeater(Module):
tx_fsm.act("WRITE",
tx_dp.send("write",
timestamp=wb_timestamp,
chan_sel=wb_chan_sel,
address=wb_address,
timestamp=cb_timestamp,
chan_sel=cb_chan_sel,
address=cb_o_address,
extra_data_cnt=wb_extra_data_cnt,
short_data=wb_data[:short_data_len]),
short_data=cb_o_data[:short_data_len]),
If(tx_dp.packet_last,
If(wb_extra_data_cnt == 0,
cb_ack.eq(1),
NextState("IDLE")
).Else(
NextState("WRITE_EXTRA")
@ -213,6 +239,7 @@ class RTPacketRepeater(Module):
tx_dp.raw_stb.eq(1),
extra_data_ce.eq(1),
If(extra_data_last,
cb_ack.eq(1),
NextState("IDLE")
)
)
@ -228,30 +255,31 @@ class RTPacketRepeater(Module):
timeout_counter.wait.eq(1),
If(timeout_counter.done,
self.err_buffer_space_timeout.eq(1),
cb_ack.eq(1),
NextState("READY")
).Else(
If(buffer_space_not,
self.cri.o_buffer_space_valid.eq(1),
cb_ack.eq(1),
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),
chan_sel=cb_chan_sel,
timeout=cb_timestamp),
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),
cb_ack.eq(1),
NextState("READY")
)
)