def __init__(self, endianness="big"):
self.source = source = stream.Endpoint(spi_core2phy_layout)
self.sink = sink = stream.Endpoint(spi_phy2core_layout)
self.bus = bus = wishbone.Interface()
self.cs = cs = Signal()
# # #
# Burst Control.
burst_cs = Signal()
burst_adr = Signal(len(bus.adr), reset_less=True)
burst_timeout = WaitTimer(MMAP_DEFAULT_TIMEOUT)
self.submodules += burst_timeout
# FSM.
self.submodules.fsm = fsm = FSM(reset_state="IDLE")
fsm.act(
"IDLE",
# Keep CS active after Burst for Timeout.
burst_timeout.wait.eq(1),
NextValue(burst_cs, burst_cs & ~burst_timeout.done),
cs.eq(burst_cs),
# On Bus Read access...
If(
bus.cyc & bus.stb & ~bus.we,
# If CS is still active and Bus address matches previous Burst address:
# Just continue the current Burst.
If(burst_cs & (bus.adr == burst_adr),
NextState("BURST-REQ")
# Otherwise initialize a new Burst.
).Else(cs.eq(0), NextState("BURST-CMD"))))
fsm.act(
"BURST-CMD",
cs.eq(1),
source.valid.eq(1),
source.cmd.eq(CMD),
source.data.eq(Cat(Signal(2), bus.adr)), # Words to Bytes.
NextValue(burst_cs, 1),
NextValue(burst_adr, bus.adr),
If(
source.ready,
NextState("BURST-REQ"),
))
fsm.act("BURST-REQ", cs.eq(1), source.valid.eq(1), source.cmd.eq(READ),
source.last.eq(1), If(
source.ready,
NextState("BURST-DAT"),
))
fsm.act(
"BURST-DAT", cs.eq(1), sink.ready.eq(1),
bus.dat_r.eq({
"big": sink.data,
"little": reverse_bytes(sink.data)
}[endianness]),
If(
sink.valid,
bus.ack.eq(1),
NextValue(burst_adr, burst_adr + 1),
NextState("IDLE"),
))
def __init__(self,
platform,
core_irq_out=Signal(),
int_level_in=Signal(16),
endianness="big",
variant="standard"):
self.variant = variant
self.icp_bus = icp_bus = wishbone.Interface(data_width=32,
adr_width=12)
self.ics_bus = ics_bus = wishbone.Interface(data_width=32,
adr_width=12)
# Bus endianness handlers
self.icp_dat_w = Signal(32)
self.icp_dat_r = Signal(32)
self.comb += self.icp_dat_w.eq(icp_bus.dat_w if endianness ==
"big" else reverse_bytes(icp_bus.dat_w))
self.comb += icp_bus.dat_r.eq(self.icp_dat_r if endianness ==
"big" else reverse_bytes(self.icp_dat_r))
self.ics_dat_w = Signal(32)
self.ics_dat_r = Signal(32)
self.comb += self.ics_dat_w.eq(ics_bus.dat_w if endianness ==
"big" else reverse_bytes(ics_bus.dat_w))
self.comb += ics_bus.dat_r.eq(self.ics_dat_r if endianness ==
"big" else reverse_bytes(self.ics_dat_r))
# XICS signals
self.ics_icp_xfer_src = Signal(4)
self.ics_icp_xfer_pri = Signal(8)
self.icp_params = dict(
# Clock / Reset
i_clk=ClockSignal(),
i_rst=ResetSignal(),
# Wishbone bus
o_wishbone_dat_r=self.icp_dat_r,
o_wishbone_ack=icp_bus.ack,
i_wishbone_adr=icp_bus.adr,
i_wishbone_dat_w=self.icp_dat_w,
i_wishbone_cyc=icp_bus.cyc,
i_wishbone_stb=icp_bus.stb,
i_wishbone_sel=icp_bus.sel,
i_wishbone_we=icp_bus.we,
i_ics_in_src=self.ics_icp_xfer_src,
i_ics_in_pri=self.ics_icp_xfer_pri,
o_core_irq_out=core_irq_out,
)
self.ics_params = dict(
# Clock / Reset
i_clk=ClockSignal(),
i_rst=ResetSignal(),
# Wishbone bus
o_wishbone_dat_r=self.ics_dat_r,
o_wishbone_ack=ics_bus.ack,
i_wishbone_adr=ics_bus.adr,
i_wishbone_dat_w=self.ics_dat_w,
i_wishbone_cyc=ics_bus.cyc,
i_wishbone_stb=ics_bus.stb,
i_wishbone_sel=ics_bus.sel,
i_wishbone_we=ics_bus.we,
i_int_level_in=int_level_in,
o_icp_out_src=self.ics_icp_xfer_src,
o_icp_out_pri=self.ics_icp_xfer_pri,
)
# add vhdl sources
self.add_sources(platform,
use_ghdl_yosys_plugin="ghdl" in self.variant)
def format_bytes(s, endianness):
return {"big": s, "little": reverse_bytes(s)}[endianness]
def __init__(self,
flash,
clock_domain="sys",
endianness="big",
with_csr=True):
self.source = source = stream.Endpoint(spi_core2phy_layout)
self.sink = sink = stream.Endpoint(spi_phy2core_layout)
self.bus = bus = wishbone.Interface()
self.cs = cs = Signal()
# Burst Control.
burst_cs = Signal()
burst_adr = Signal(len(bus.adr), reset_less=True)
burst_timeout = WaitTimer(MMAP_DEFAULT_TIMEOUT)
self.submodules += burst_timeout
cmd_bits = 8
data_bits = 32
if flash.cmd_width == 1:
self._default_dummy_bits = flash.dummy_bits if flash.fast_mode else 0
elif flash.cmd_width == 4:
self._default_dummy_bits = flash.dummy_bits * 3 if flash.fast_mode else 0
else:
raise NotImplementedError(
f'Command width of {flash.cmd_width} bits is currently not supported!'
)
self._spi_dummy_bits = spi_dummy_bits = Signal(8)
if with_csr:
self.dummy_bits = dummy_bits = CSRStorage(
8, reset=self._default_dummy_bits)
if clock_domain != "sys":
self.specials += MultiReg(dummy_bits.storage, spi_dummy_bits,
clock_domain)
else:
self.comb += spi_dummy_bits.eq(dummy_bits.storage)
else:
self.comb += spi_dummy_bits.eq(self._default_dummy_bits)
dummy = Signal(data_bits, reset=0xdead)
# FSM.
self.submodules.fsm = fsm = FSM(reset_state="IDLE")
fsm.act(
"IDLE",
# Keep CS active after Burst for Timeout.
burst_timeout.wait.eq(1),
NextValue(burst_cs, burst_cs & ~burst_timeout.done),
cs.eq(burst_cs),
# On Bus Read access...
If(
bus.cyc & bus.stb & ~bus.we,
# If CS is still active and Bus address matches previous Burst address:
# Just continue the current Burst.
If(burst_cs & (bus.adr == burst_adr),
NextState("BURST-REQ")
# Otherwise initialize a new Burst.
).Else(cs.eq(0), NextState("BURST-CMD"))))
fsm.act(
"BURST-CMD",
cs.eq(1),
source.valid.eq(1),
source.data.eq(flash.read_opcode.code), # send command.
source.len.eq(cmd_bits),
source.width.eq(flash.cmd_width),
source.mask.eq(cmd_oe_mask[flash.cmd_width]),
NextValue(burst_adr, bus.adr),
If(
source.ready,
NextState("CMD-RET"),
))
fsm.act("CMD-RET", cs.eq(1), sink.ready.eq(1),
If(
sink.valid,
NextState("BURST-ADDR"),
))
fsm.act(
"BURST-ADDR",
cs.eq(1),
source.valid.eq(1),
source.width.eq(flash.addr_width),
source.mask.eq(addr_oe_mask[flash.addr_width]),
source.data.eq(Cat(Signal(2), bus.adr)), # send address.
source.len.eq(flash.addr_bits),
NextValue(burst_cs, 1),
NextValue(burst_adr, bus.adr),
If(
source.ready,
NextState("ADDR-RET"),
))
fsm.act(
"ADDR-RET", cs.eq(1), sink.ready.eq(1),
If(
sink.valid,
If(
spi_dummy_bits == 0,
NextState("BURST-REQ"),
).Else(NextState("DUMMY"), )))
fsm.act("DUMMY", cs.eq(1), source.valid.eq(1),
source.width.eq(flash.addr_width),
source.mask.eq(addr_oe_mask[flash.addr_width]),
source.data.eq(dummy), source.len.eq(spi_dummy_bits),
If(
source.ready,
NextState("DUMMY-RET"),
))
fsm.act("DUMMY-RET", cs.eq(1), sink.ready.eq(1),
If(
sink.valid,
NextState("BURST-REQ"),
))
fsm.act("BURST-REQ", cs.eq(1), source.valid.eq(1), source.last.eq(1),
source.width.eq(flash.bus_width), source.len.eq(data_bits),
source.mask.eq(0), If(
source.ready,
NextState("BURST-DAT"),
))
fsm.act(
"BURST-DAT", cs.eq(1), sink.ready.eq(1),
bus.dat_r.eq({
"big": sink.data,
"little": reverse_bytes(sink.data)
}[endianness]),
If(
sink.valid,
bus.ack.eq(1),
NextValue(burst_adr, burst_adr + 1),
NextState("IDLE"),
))
