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serdes-transceiver
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make debug mode

This commit is contained in:
occheung 2023-04-24 12:09:34 +08:00
parent 7035082d7f
commit b38a4d6b8c
1 changed files with 341 additions and 248 deletions
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589
single_serdes_loopback.py
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@ -12,7 +12,7 @@ from io_loopback import SingleIOLoopback
SEPARATOR = Constant(0b0101)
class SingleSerDesLoopBack(Module):
def __init__(self, io_pad, sys_clk_freq):
def __init__(self, io_pad, sys_clk_freq, debug):
self.uart_rx = Signal()
self.uart_tx = Signal()
@ -26,14 +26,17 @@ class SingleSerDesLoopBack(Module):
self.submodules.rx = SingleLineRX()
# Primary adjustment to master-slave bitslip
self.submodules.bitslip_reader = BitSlipReader()
self.submodules.slave_aligner = SlaveAligner()
self.submodules.post_align_reader = BitSlipReader()
# Optimal delay solver
self.submodules.phase_reader = PhaseReader()
self.submodules.delay_solver = DelayOptimizer()
# Debugging readers
if debug:
self.submodules.bitslip_reader = BitSlipReader()
self.submodules.post_align_reader = BitSlipReader()
self.submodules.phase_reader = PhaseReader()
# The actual channel
self.submodules.channel = SingleIOLoopback(io_pad)
@ -57,243 +60,64 @@ class SingleSerDesLoopBack(Module):
# Route deserializer to phase_reader & the delay tap optimizer
self.comb += [
# Start the reader initially
self.bitslip_reader.start.eq(1),
# Delay tap optimizer will start after the reader is done
self.slave_aligner.start.eq(0),
self.post_align_reader.start.eq(0),
self.phase_reader.start.eq(0),
self.delay_solver.start.eq(0),
# RXDATA for both reader and optimzer
self.bitslip_reader.loopback_rxdata.eq(self.rx.rxdata),
# RXDATA for aligner & optimzer
self.slave_aligner.loopback_rxdata.eq(self.rx.rxdata),
self.post_align_reader.loopback_rxdata.eq(self.rx.rxdata),
self.phase_reader.loopback_rxdata.eq(self.rx.rxdata),
self.delay_solver.loopback_rxdata.eq(self.rx.rxdata),
# Delay tap value
self.phase_reader.delay_tap.eq(self.rx.cnt_out),
self.delay_solver.delay_tap.eq(self.rx.cnt_out),
# IDELAY delay tap control, such that phase_reader can
# change tap value after delay measurement
self.rx.ce.eq(
self.phase_reader.inc_en |
self.delay_solver.inc_en
),
self.rx.master_bitslip.eq(
self.bitslip_reader.bitslip |
self.slave_aligner.master_bitslip |
self.post_align_reader.bitslip
),
self.rx.slave_bitslip.eq(
self.bitslip_reader.bitslip |
self.slave_aligner.slave_bitslip |
self.post_align_reader.bitslip
),
self.rx.ce.eq(self.delay_solver.inc_en),
self.rx.master_bitslip.eq(self.slave_aligner.master_bitslip),
self.rx.slave_bitslip.eq(self.slave_aligner.slave_bitslip),
self.rx.ld.eq(self.delay_solver.ld),
self.rx.cnt_in.eq(self.delay_solver.opt_delay_tap),
]
# Show measured result on UART
delay_tap_count = Signal(6)
bitslip_count = Signal(3)
post_align_bitslip_count = Signal(3)
# Debugging logics
if debug:
self.comb += [
# Start the reader initially
self.bitslip_reader.start.eq(1),
self.post_align_reader.start.eq(0),
self.phase_reader.start.eq(0),
self.bitslip_reader.loopback_rxdata.eq(self.rx.rxdata),
self.post_align_reader.loopback_rxdata.eq(self.rx.rxdata),
self.phase_reader.loopback_rxdata.eq(self.rx.rxdata),
self.phase_reader.delay_tap.eq(self.rx.cnt_out),
self.rx.ce.eq(
self.phase_reader.inc_en |
self.delay_solver.inc_en
),
self.rx.master_bitslip.eq(
self.bitslip_reader.bitslip |
self.slave_aligner.master_bitslip |
self.post_align_reader.bitslip
),
self.rx.slave_bitslip.eq(
self.bitslip_reader.bitslip |
self.slave_aligner.slave_bitslip |
self.post_align_reader.bitslip
),
]
if debug:
delay_tap_count = Signal(6)
bitslip_count = Signal(3)
post_align_bitslip_count = Signal(3)
rx_intra_aligned = Signal()
select_odd = Signal()
fsm = FSM(reset_state="WAIT_DONE")
self.submodules += fsm
fsm.act("WAIT_DONE",
If(self.bitslip_reader.done,
NextState("WRITE_UPPER"),
),
)
fsm.act("WRITE_UPPER",
# Exist state if all results are sent
If(bitslip_count == 5,
NextState("START_SLAVE_ALIGNER"),
).Elif(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.bitslip_reader.data_result[bitslip_count][8:]),
NextState("WRITE_LOWER"),
),
)
fsm.act("WRITE_LOWER",
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.bitslip_reader.data_result[bitslip_count][:8]),
NextValue(bitslip_count, bitslip_count + 1),
NextState("WRITE_UPPER"),
)
fsm.act("START_SLAVE_ALIGNER",
self.slave_aligner.start.eq(1),
# self.rx.ce.eq(self.delay_optimizer.inc_en),
If(self.slave_aligner.done,
NextState("WRITE_DONE_UPPER"),
).Else(
NextState("START_SLAVE_ALIGNER")
)
)
fsm.act("WRITE_DONE_UPPER",
self.post_align_reader.start.eq(1),
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0xFF),
NextState("WRITE_DONE_LOWER")
)
)
fsm.act("WRITE_DONE_LOWER",
self.post_align_reader.start.eq(1),
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0xFF),
NextState("REREAD_BITSLIP")
)
)
fsm.act("REREAD_BITSLIP",
If(self.post_align_reader.done,
NextState("REWRITE_UPPER"),
).Else(
NextState("REREAD_BITSLIP"),
),
)
fsm.act("REWRITE_UPPER",
# Exist state if all results are sent
If(post_align_bitslip_count == 5,
NextState("WRITE_B2P_DIVIDER_UPPER"),
).Elif(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.post_align_reader.data_result[post_align_bitslip_count][8:]),
NextState("REWRITE_LOWER"),
),
)
fsm.act("REWRITE_LOWER",
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.post_align_reader.data_result[post_align_bitslip_count][:8]),
NextValue(post_align_bitslip_count, post_align_bitslip_count + 1),
NextState("REWRITE_UPPER"),
)
fsm.act("WRITE_B2P_DIVIDER_UPPER",
self.phase_reader.start.eq(1),
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0xFF),
NextState("WRITE_B2P_DIVIDER_LOWER"),
)
)
fsm.act("WRITE_B2P_DIVIDER_LOWER",
self.phase_reader.start.eq(1),
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0xFF),
NextState("WAIT_PHASE_READER"),
)
)
fsm.act("WAIT_PHASE_READER",
If(self.phase_reader.done,
NextState("WRITE_DELAY_UPPER"),
).Else(
NextState("WAIT_PHASE_READER"),
)
)
fsm.act("WRITE_DELAY_UPPER",
If(delay_tap_count == 32,
NextState("DELAY_SOLVER_DIVIDER_UPPER")
).Elif(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.phase_reader.data_result[delay_tap_count][8:]),
NextState("WRITE_DELAY_LOWER"),
),
)
fsm.act("WRITE_DELAY_LOWER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.phase_reader.data_result[delay_tap_count][:8]),
NextValue(delay_tap_count, delay_tap_count + 1),
NextState("WRITE_DELAY_UPPER")
),
)
fsm.act("DELAY_SOLVER_DIVIDER_UPPER",
self.delay_solver.start.eq(1),
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0xFF),
NextState("DELAY_SOLVER_DIVIDER_LOWER"),
)
)
fsm.act("DELAY_SOLVER_DIVIDER_LOWER",
self.delay_solver.start.eq(1),
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0xFF),
NextState("WAIT_DELAY_SOLVER"),
)
)
fsm.act("WAIT_DELAY_SOLVER",
If(self.delay_solver.done,
NextValue(select_odd, self.delay_solver.select_odd),
NextState("WRITE_UPPER_ZERO"),
).Else(
NextState("WAIT_DELAY_SOLVER"),
)
)
fsm.act("WRITE_UPPER_ZERO",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0x00),
NextState("WRITE_LOWER_OPT"),
)
)
fsm.act("WRITE_LOWER_OPT",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.delay_solver.opt_delay_tap),
NextState("RESAMPLE_RXDATA_UPPER"),
),
)
fsm.act("RESAMPLE_RXDATA_UPPER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.rx.rxdata[8:]),
NextState("RESAMPLE_RXDATA_LOWER"),
)
)
fsm.act("RESAMPLE_RXDATA_LOWER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.rx.rxdata[:8]),
NextState("INTRA_ALIGN_DONE"),
)
)
fsm.act("INTRA_ALIGN_DONE",
rx_intra_aligned.eq(1),
NextState("WAIT_TX_ZERO"),
)
rxdata_decimated = Signal(5)
rxdata_pulse_read = Signal(10)
self.comb += [
If(select_odd,
@ -303,40 +127,309 @@ class SingleSerDesLoopBack(Module):
),
]
fsm.act("WAIT_TX_ZERO",
If(rxdata_decimated == 0,
NextState("WAIT_PULSE"),
),
)
if not debug:
release_fsm = FSM(reset_state="WAIT_ALIGNER")
self.submodules += release_fsm
rxdata_pulse_read = Signal(10)
release_fsm.act("WAIT_ALIGNER",
self.slave_aligner.start.eq(1),
If(self.slave_aligner.done,
NextState("WAIT_DELAY_OPT"),
),
)
fsm.act("WAIT_PULSE",
If(rxdata_decimated != 0,
NextValue(rxdata_pulse_read, rxdata_decimated),
release_fsm.act("WAIT_DELAY_OPT",
self.delay_solver.start.eq(1),
If(self.delay_solver.done,
NextValue(select_odd, self.delay_solver.select_odd),
NextState("INTRA_ALIGN_DONE"),
),
)
release_fsm.act("INTRA_ALIGN_DONE",
rx_intra_aligned.eq(1),
NextState("WAIT_TX_ZERO"),
)
release_fsm.act("WAIT_TX_ZERO",
If(rxdata_decimated == 0,
NextState("WAIT_PULSE"),
),
)
release_fsm.act("WAIT_PULSE",
If(rxdata_decimated != 0,
NextValue(rxdata_pulse_read, rxdata_decimated),
NextState("NEXT_RXDATA"),
),
)
next_rxdata = Signal(5)
release_fsm.act("NEXT_RXDATA",
NextValue(next_rxdata, rxdata_decimated),
NextState("WRITE_PULSE_UPPER"),
)
)
fsm.act("WRITE_PULSE_UPPER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(rxdata_pulse_read[8:]),
NextState("WRITE_PULSE_LOWER"),
release_fsm.act("WRITE_PULSE_UPPER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0),
NextState("WRITE_PULSE_LOWER"),
),
)
)
fsm.act("WRITE_PULSE_LOWER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(rxdata_pulse_read[:8]),
release_fsm.act("WRITE_PULSE_LOWER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(rxdata_pulse_read),
NextState("WRITE_NEXT_UPPER"),
),
)
release_fsm.act("WRITE_NEXT_UPPER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0),
NextState("WRITE_NEXT_LOWER"),
),
)
release_fsm.act("WRITE_NEXT_LOWER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(next_rxdata),
NextState("TERMINATE"),
),
)
release_fsm.act("TERMINATE",
NextState("TERMINATE"),
)
)
fsm.act("TERMINATE",
NextState("TERMINATE"),
)
else:
fsm = FSM(reset_state="WAIT_DONE")
self.submodules += fsm
fsm.act("WAIT_DONE",
If(self.bitslip_reader.done,
NextState("WRITE_UPPER"),
),
)
fsm.act("WRITE_UPPER",
# Exist state if all results are sent
If(bitslip_count == 5,
NextState("START_SLAVE_ALIGNER"),
).Elif(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.bitslip_reader.data_result[bitslip_count][8:]),
NextState("WRITE_LOWER"),
),
)
fsm.act("WRITE_LOWER",
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.bitslip_reader.data_result[bitslip_count][:8]),
NextValue(bitslip_count, bitslip_count + 1),
NextState("WRITE_UPPER"),
)
fsm.act("START_SLAVE_ALIGNER",
self.slave_aligner.start.eq(1),
# self.rx.ce.eq(self.delay_optimizer.inc_en),
If(self.slave_aligner.done,
NextState("WRITE_DONE_UPPER"),
).Else(
NextState("START_SLAVE_ALIGNER")
)
)
fsm.act("WRITE_DONE_UPPER",
self.post_align_reader.start.eq(1),
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0xFF),
NextState("WRITE_DONE_LOWER")
)
)
fsm.act("WRITE_DONE_LOWER",
self.post_align_reader.start.eq(1),
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0xFF),
NextState("REREAD_BITSLIP")
)
)
fsm.act("REREAD_BITSLIP",
If(self.post_align_reader.done,
NextState("REWRITE_UPPER"),
).Else(
NextState("REREAD_BITSLIP"),
),
)
fsm.act("REWRITE_UPPER",
# Exist state if all results are sent
If(post_align_bitslip_count == 5,
NextState("WRITE_B2P_DIVIDER_UPPER"),
).Elif(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.post_align_reader.data_result[post_align_bitslip_count][8:]),
NextState("REWRITE_LOWER"),
),
)
fsm.act("REWRITE_LOWER",
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.post_align_reader.data_result[post_align_bitslip_count][:8]),
NextValue(post_align_bitslip_count, post_align_bitslip_count + 1),
NextState("REWRITE_UPPER"),
)
fsm.act("WRITE_B2P_DIVIDER_UPPER",
self.phase_reader.start.eq(1),
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0xFF),
NextState("WRITE_B2P_DIVIDER_LOWER"),
)
)
fsm.act("WRITE_B2P_DIVIDER_LOWER",
self.phase_reader.start.eq(1),
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0xFF),
NextState("WAIT_PHASE_READER"),
)
)
fsm.act("WAIT_PHASE_READER",
If(self.phase_reader.done,
NextState("WRITE_DELAY_UPPER"),
).Else(
NextState("WAIT_PHASE_READER"),
)
)
fsm.act("WRITE_DELAY_UPPER",
If(delay_tap_count == 32,
NextState("DELAY_SOLVER_DIVIDER_UPPER")
).Elif(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.phase_reader.data_result[delay_tap_count][8:]),
NextState("WRITE_DELAY_LOWER"),
),
)
fsm.act("WRITE_DELAY_LOWER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.phase_reader.data_result[delay_tap_count][:8]),
NextValue(delay_tap_count, delay_tap_count + 1),
NextState("WRITE_DELAY_UPPER")
),
)
fsm.act("DELAY_SOLVER_DIVIDER_UPPER",
self.delay_solver.start.eq(1),
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0xFF),
NextState("DELAY_SOLVER_DIVIDER_LOWER"),
)
)
fsm.act("DELAY_SOLVER_DIVIDER_LOWER",
self.delay_solver.start.eq(1),
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0xFF),
NextState("WAIT_DELAY_SOLVER"),
)
)
fsm.act("WAIT_DELAY_SOLVER",
If(self.delay_solver.done,
NextValue(select_odd, self.delay_solver.select_odd),
NextState("WRITE_UPPER_ZERO"),
).Else(
NextState("WAIT_DELAY_SOLVER"),
)
)
fsm.act("WRITE_UPPER_ZERO",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(0x00),
NextState("WRITE_LOWER_OPT"),
)
)
fsm.act("WRITE_LOWER_OPT",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.delay_solver.opt_delay_tap),
NextState("RESAMPLE_RXDATA_UPPER"),
),
)
fsm.act("RESAMPLE_RXDATA_UPPER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.rx.rxdata[8:]),
NextState("RESAMPLE_RXDATA_LOWER"),
)
)
fsm.act("RESAMPLE_RXDATA_LOWER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(self.rx.rxdata[:8]),
NextState("INTRA_ALIGN_DONE"),
)
)
fsm.act("INTRA_ALIGN_DONE",
rx_intra_aligned.eq(1),
NextState("WAIT_TX_ZERO"),
)
fsm.act("WAIT_TX_ZERO",
If(rxdata_decimated == 0,
NextState("WAIT_PULSE"),
),
)
fsm.act("WAIT_PULSE",
If(rxdata_decimated != 0,
NextValue(rxdata_pulse_read, rxdata_decimated),
NextState("WRITE_PULSE_UPPER"),
)
)
fsm.act("WRITE_PULSE_UPPER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(rxdata_pulse_read[8:]),
NextState("WRITE_PULSE_LOWER"),
)
)
fsm.act("WRITE_PULSE_LOWER",
If(self.tx_fifo.writable,
self.tx_fifo.we.eq(1),
self.tx_fifo.din.eq(rxdata_pulse_read[:8]),
NextState("TERMINATE"),
)
)
fsm.act("TERMINATE",
NextState("TERMINATE"),
)
tx_fsm = FSM(reset_state="SEND_TRAINING")
self.submodules += tx_fsm
@ -383,7 +476,7 @@ if __name__ == "__main__":
pad = platform.request("dio{}".format(eem), 0)
crg = KasliCRG(platform)
top = SingleSerDesLoopBack(pad, crg.sys_clk_freq)
top = SingleSerDesLoopBack(pad, crg.sys_clk_freq, False)
# Wire up UART core to the pads
uart_pads = platform.request("serial")