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cores/icap/ICAP: Rewrite using with an FSM instead of Timeline (will be easier to extend).

This commit is contained in:
Florent Kermarrec 2021-10-04 15:06:03 +02:00
parent 9416e30249
commit 3504904c09
2 changed files with 76 additions and 32 deletions
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106
litex/soc/cores/icap.py
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@ -8,7 +8,6 @@ from enum import IntEnum
from migen import *
from migen.genlib.misc import timeline
from migen.genlib.cdc import PulseSynchronizer
from litex.soc.interconnect.csr import *
@ -97,50 +96,95 @@ class ICAP(Module, AutoCSR):
self.submodules += ps_send
self.comb += ps_send.i.eq(self.send)
# Generate ICAP bitstream write sequence.
# Generate ICAP bitstream sequence.
self._csib = _csib = Signal(reset=1)
self._rdwrb = _rdwrb = Signal()
self._i = _i = Signal(32)
self.sync.icap += [
_i.eq(ICAP_DUMMY), # Dummy (Default).
timeline(ps_send.o, [
# Clear Done.
(1, [_csib.eq(1), self.done.eq(0)]),
# Synchronize.
(2, [_csib.eq(0), _i.eq(ICAP_NOOP)]), # No Op.
(3, [_csib.eq(0), _i.eq(ICAP_SYNC)]), # Sync Word.
(4, [_csib.eq(0), _i.eq(ICAP_NOOP)]), # No Op.
(5, [_csib.eq(0), _i.eq(ICAP_NOOP)]), # No Op.
count = Signal(4)
fsm = FSM(reset_state="WAIT")
fsm = ClockDomainsRenamer("icap")(fsm)
self.submodules += fsm
# Write User's data to addr Register.
(6, [_csib.eq(0), _i.eq(ICAP_WRITE | (self.addr << 13) | 1)]), # Set Register.
(7, [_csib.eq(0), _i.eq(self.data)]), # Set Register Data.
(8, [_csib.eq(0), _i.eq(ICAP_NOOP)]), # No Op.
(9, [_csib.eq(0), _i.eq(ICAP_NOOP)]), # No Op.
# De-Synchronize.
(10, [_csib.eq(0), _i.eq(ICAP_WRITE | (ICAPRegisters.CMD << 13) | 1)]), # Write to CMD Register.
(11, [_csib.eq(0), _i.eq(ICAPCMDs.DESYNC)]), # DESYNC CMD.
(12, [_csib.eq(0), _i.eq(ICAP_NOOP)]), # No Op.
(13, [_csib.eq(0), _i.eq(ICAP_NOOP)]), # No Op.
# Wait User Command.
fsm.act("WAIT",
# Set ICAP in IDLE state.
_csib.eq(1),
_rdwrb.eq(0),
_i.eq(ICAP_DUMMY),
# Set Done.
(14, [_csib.eq(1), self.done.eq(1)]),
])
]
self.done.eq(1),
# ICAP instance
# Wait User Command.
If(ps_send.o,
NextValue(count, 0),
NextState("SYNC")
)
)
# Send ICAP Synchronization sequence.
fsm.act("SYNC",
_csib.eq(0),
_rdwrb.eq(0),
Case(count, {
0 : _i.eq(ICAP_NOOP), # No Op.
1 : _i.eq(ICAP_SYNC), # Sync Word.
2 : _i.eq(ICAP_NOOP), # No Op.
3 : _i.eq(ICAP_NOOP), # No Op.
}),
NextValue(count, count + 1),
If(count == (4-1),
NextValue(count, 0),
NextState("WRITE")
)
)
# Send ICAP Write sequence.
fsm.act("WRITE",
_csib.eq(0),
_rdwrb.eq(0),
Case(count, {
0 : _i.eq(ICAP_WRITE | (self.addr << 13) | 1), # Set Register.
1 : _i.eq(self.data), # Set Register Data.
2 : _i.eq(ICAP_NOOP), # No Op.
3 : _i.eq(ICAP_NOOP), # No Op.
}),
NextValue(count, count + 1),
If(count == (4-1),
NextValue(count, 0),
NextState("DESYNC")
)
)
# Send ICAP Desynchronization sequence.
fsm.act("DESYNC",
_csib.eq(0),
_rdwrb.eq(0),
Case(count, {
0 : _i.eq(ICAP_WRITE | (ICAPRegisters.CMD << 13) | 1), # Write to CMD Register.
1 : _i.eq(ICAPCMDs.DESYNC), # DESYNC CMD.
2 : _i.eq(ICAP_NOOP), # No Op.
3 : _i.eq(ICAP_NOOP), # No Op.
}),
NextValue(count, count + 1),
If(count == (4-1),
NextValue(count, 0),
NextState("WAIT")
)
)
# ICAP Instance.
if not simulation:
self.specials += Instance("ICAPE2",
p_ICAP_WIDTH = "X32",
i_CLK = ClockSignal("icap"),
i_CSIB = _csib,
i_RDWRB = 0,
i_RDWRB = _rdwrb,
i_I = Cat(*[_i[8*i:8*(i+1)][::-1] for i in range(4)]),
)
# CSR
# CSR.
if with_csr:
self.add_csr()
@ -167,8 +211,8 @@ class ICAP(Module, AutoCSR):
)
)
fsm.act("RELOAD",
self.addr.eq(0x4),
self.data.eq(0xf),
self.addr.eq(ICAPRegisters.CMD),
self.data.eq(ICAPCMDs.IPROG),
self.send.eq(1),
)