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serdes-transceiver
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debug delay tap solver

master
occheung 2023-04-24 06:13:05 +08:00
parent e2a8433f83
commit ff7c892fd6
1 changed files with 109 additions and 12 deletions
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121
single_serdes_loopback.py
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@ -24,9 +24,16 @@ class SingleSerDesLoopBack(Module):
self.submodules.tx = SingleLineTX()
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()
# self.submodules.delay_optimizer = DelayOptimizer()
# The actual channel
@ -55,21 +62,21 @@ class SingleSerDesLoopBack(Module):
# Start the reader initially
self.bitslip_reader.start.eq(1),
# Delay tap optimizer will start after the reader is done
# self.delay_optimizer.start.eq(0),
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),
# TODO: Reconnet
# self.delay_optimizer.loopback_rxdata.eq(self.rx.rxdata),
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),
# TODO: Reconnet
# self.delay_optimizer.delay_tap.eq(self.rx.cnt_out),
self.phase_reader.delay_tap.eq(self.rx.cnt_out),
self.delay_solver.delay_tap.eq(self.rx.cnt_out),
# Increment control enable, such that phase_reader can
# increment tap value after delay measurement
@ -79,7 +86,10 @@ class SingleSerDesLoopBack(Module):
# ).Else(
# self.rx.ce.eq(self.phase_reader.inc_en),
# )
# self.rx.ce.eq(self.phase_reader.inc_en),
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 |
@ -93,7 +103,7 @@ class SingleSerDesLoopBack(Module):
]
# Show measured result on UART
delay_tap = Signal(6)
delay_tap_count = Signal(6)
bitslip_count = Signal(3)
post_align_bitslip_count = Signal(3)
@ -109,7 +119,7 @@ class SingleSerDesLoopBack(Module):
fsm.act("WRITE_UPPER",
# Exist state if all results are sent
If(bitslip_count == 5,
NextState("FIND_OPT_DELAY"),
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:]),
@ -124,13 +134,13 @@ class SingleSerDesLoopBack(Module):
NextState("WRITE_UPPER"),
)
fsm.act("FIND_OPT_DELAY",
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("FIND_OPT_DELAY")
NextState("START_SLAVE_ALIGNER")
)
)
@ -163,7 +173,7 @@ class SingleSerDesLoopBack(Module):
fsm.act("REWRITE_UPPER",
# Exist state if all results are sent
If(post_align_bitslip_count == 5,
NextState("TERMINATE"),
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:]),
@ -178,6 +188,93 @@ class SingleSerDesLoopBack(Module):
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,
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("TERMINATE"),
),
)
fsm.act("TERMINATE",
NextState("TERMINATE"),
)