occheung/serdes-transceiver
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adjust register-wide bitslip right after slave bitslip

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This commit is contained in:
occheung 2023-04-24 07:10:18 +08:00
parent ff7c892fd6
commit e6902d1da5
1 changed files with 38 additions and 3 deletions
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41
sync_serdes.py
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@ -264,7 +264,7 @@ class SlaveAligner(Module):
self.master_bitslip.eq(1),
self.slave_bitslip.eq(1),
If(self.slip_count == 5,
NextState("TERMINATE"),
NextState("SHIFT_WAIT_TIMER"),
).Else(
NextState("WAIT_TIMER"),
)
@ -277,7 +277,7 @@ class SlaveAligner(Module):
fsm.act("CHECK_MASTER_BITSLIP",
# At any point if the odd and/or even bits from the master reads 0
# It implies the detuning is completed
NextState("TERMINATE"),
NextState("SHIFT_WAIT_TIMER"),
If(check_odd & (odd_master_rxdata != 0),
NextState("MASTER_HIGH_BITSLIP_FIRST"),
),
@ -308,13 +308,48 @@ class SlaveAligner(Module):
)
)
# After eliminating the potentially duplicating pattern,
# Shift the entire output pattern for delay tap optimization
# Ideally, the optimized first edge would be the middle pair
# So, shift it until bit 4/5 is set and bit 6 is not set
fsm.act("SHIFT_WAIT_TIMER",
self.stab_timer.wait.eq(1),
If(self.stab_timer.done,
NextState("SHIFT_SAMPLE_PATTERN"),
)
)
fsm.act("SHIFT_SAMPLE_PATTERN",
If((self.loopback_rxdata[4:6] != 0) & ~self.loopback_rxdata[6],
NextState("TERMINATE"),
).Else(
NextState("SHIFT_HIGH_BITSLIP_FIRST"),
)
)
fsm.act("SHIFT_HIGH_BITSLIP_FIRST",
self.master_bitslip.eq(1),
self.slave_bitslip.eq(1),
NextState("SHIFT_LOW_BITSLIP"),
)
fsm.act("SHIFT_LOW_BITSLIP",
# bitslip signal is auto-reset
NextState("SHIFT_HIGH_BITSLIP_SECOND"),
)
fsm.act("SHIFT_HIGH_BITSLIP_SECOND",
self.master_bitslip.eq(1),
self.slave_bitslip.eq(1),
NextState("SHIFT_WAIT_TIMER")
)
fsm.act("TERMINATE",
self.done.eq(1),
NextState("TERMINATE"),
)
class PhaseReader(Module):
def __init__(self):
# Drive IDELAYE2 CE pin to increment delay