def __init__(self,
platform,
with_cpu=False,
with_analyzer=True,
with_loopback=False):
clk_freq = int(100e6)
SoCSDRAM.__init__(self,
platform,
clk_freq,
cpu_type="lm32" if with_cpu else None,
integrated_rom_size=0x8000 if with_cpu else 0,
integrated_sram_size=0x8000,
with_uart=with_cpu,
ident="PCIe Injector example design",
with_timer=with_cpu)
self.submodules.crg = _CRG(platform)
if not with_cpu:
# use serial as wishbone bridge when no cpu
self.add_cpu_or_bridge(
UARTWishboneBridge(platform.request("serial"),
clk_freq,
baudrate=3000000))
self.add_wb_master(self.cpu_or_bridge.wishbone)
# sdram
self.submodules.ddrphy = a7ddrphy.A7DDRPHY(platform.request("ddram"))
sdram_module = MT41K256M16(self.clk_freq, "1:4")
self.register_sdram(self.ddrphy, sdram_module.geom_settings,
sdram_module.timing_settings)
# pcie endpoint
self.submodules.pciephy = S7PCIEPHY(platform,
platform.request("pcie_x1"),
cd="sys")
# usb core
usb_pads = platform.request("usb_fifo")
# self.submodules.usb_phy = FT245PHYSynchronous(usb_pads, clk_freq, fifo_depth=16)
self.submodules.usb_phy = FT601Sync(usb_pads, dw=32, timeout=1024)
if with_loopback:
self.submodules.usb_loopback_fifo = stream.SyncFIFO(
phy_description(32), 2048)
self.comb += [
self.usb_phy.source.connect(self.usb_loopback_fifo.sink),
self.usb_loopback_fifo.source.connect(self.usb_phy.sink)
]
else:
self.submodules.usb_core = USBCore(self.usb_phy, clk_freq)
# usb <--> wishbone
self.submodules.etherbone = Etherbone(self.usb_core,
self.usb_map["wishbone"])
self.add_wb_master(self.etherbone.master.bus)
# usb <--> tlp
self.submodules.tlp = TLP(self.usb_core, self.usb_map["tlp"])
self.comb += [
self.pciephy.source.connect(self.tlp.sender.sink),
self.tlp.receiver.source.connect(self.pciephy.sink)
]
# wishbone --> msi
self.submodules.msi = MSI()
self.comb += self.msi.source.connect(self.pciephy.msi)
# led blink
usb_counter = Signal(32)
self.sync.usb += usb_counter.eq(usb_counter + 1)
self.comb += platform.request("user_led", 0).eq(usb_counter[26])
pcie_counter = Signal(32)
self.sync.pcie += pcie_counter.eq(pcie_counter + 1)
self.comb += platform.request("user_led", 1).eq(pcie_counter[26])
# timing constraints
self.crg.cd_sys.clk.attr.add("keep")
self.crg.cd_usb.clk.attr.add("keep")
self.platform.add_period_constraint(self.crg.cd_sys.clk, 10.0)
self.platform.add_period_constraint(self.crg.cd_usb.clk, 10.0)
self.platform.add_period_constraint(
self.platform.lookup_request("pcie_x1").clk_p, 10.0)
if with_analyzer:
analyzer_signals = [
self.pciephy.sink.valid, self.pciephy.sink.ready,
self.pciephy.sink.last, self.pciephy.sink.dat,
self.pciephy.sink.be, self.pciephy.source.valid,
self.pciephy.source.ready, self.pciephy.source.last,
self.pciephy.source.dat, self.pciephy.source.be
]
self.submodules.analyzer = LiteScopeAnalyzer(analyzer_signals,
1024,
cd="sys")
def __init__(self, pads, dw=32, timeout=1024):
read_fifo = ClockDomainsRenamer({
"write": "usb",
"read": "sys"
})(stream.AsyncFIFO(phy_description(dw), 128))
write_fifo = ClockDomainsRenamer({
"write": "sys",
"read": "usb"
})(stream.AsyncFIFO(phy_description(dw), 128))
read_buffer = ClockDomainsRenamer("usb")(stream.SyncFIFO(
phy_description(dw), 4))
self.comb += read_buffer.source.connect(read_fifo.sink)
self.submodules += read_fifo
self.submodules += read_buffer
self.submodules += write_fifo
self.read_buffer = read_buffer
self.sink = write_fifo.sink
self.source = read_fifo.source
self.tdata_w = tdata_w = Signal(dw)
self.data_r = data_r = Signal(dw)
self.data_oe = data_oe = Signal()
self.specials += Tristate(pads.data, tdata_w, data_oe, data_r)
data_w = Signal(dw)
_data_w = Signal(dw)
self.sync.usb += [_data_w.eq(data_w)]
for i in range(dw):
self.specials += [
Instance("ODDR",
p_DDR_CLK_EDGE="SAME_EDGE",
i_C=ClockSignal("usb"),
i_CE=1,
i_S=0,
i_R=0,
i_D1=_data_w[i],
i_D2=data_w[i],
o_Q=tdata_w[i])
]
self.rd_n = rd_n = Signal()
_rd_n = Signal(reset=1)
self.wr_n = wr_n = Signal()
_wr_n = Signal(reset=1)
self.oe_n = oe_n = Signal()
_oe_n = Signal(reset=1)
self.sync.usb += [
_rd_n.eq(rd_n),
_wr_n.eq(wr_n),
_oe_n.eq(oe_n),
]
self.specials += [
Instance("ODDR",
p_DDR_CLK_EDGE="SAME_EDGE",
i_C=ClockSignal("usb"),
i_CE=1,
i_S=0,
i_R=0,
i_D1=_rd_n,
i_D2=rd_n,
o_Q=pads.rd_n),
Instance("ODDR",
p_DDR_CLK_EDGE="SAME_EDGE",
i_C=ClockSignal("usb"),
i_CE=1,
i_S=0,
i_R=0,
i_D1=_wr_n,
i_D2=wr_n,
o_Q=pads.wr_n),
Instance("ODDR",
p_DDR_CLK_EDGE="SAME_EDGE",
i_C=ClockSignal("usb"),
i_CE=1,
i_S=0,
i_R=0,
i_D1=_oe_n,
i_D2=oe_n,
o_Q=pads.oe_n)
]
self.comb += [
pads.rst.eq(~ResetSignal("usb")),
pads.be.eq(0xf),
pads.siwua.eq(1),
data_oe.eq(oe_n),
]
fsm = FSM()
self.submodules.fsm = ClockDomainsRenamer("usb")(fsm)
self.tempsendval = tempsendval = Signal(dw)
self.temptosend = temptosend = Signal()
self.tempreadval = tempreadval = Signal(dw)
self.temptoread = temptoread = Signal()
self.wants_read = wants_read = Signal()
self.wants_write = wants_write = Signal()
self.cnt_write = cnt_write = Signal(max=timeout + 1)
self.cnt_read = cnt_read = Signal(max=timeout + 1)
first_write = Signal()
self.comb += [
wants_read.eq(~temptoread & ~pads.rxf_n),
wants_write.eq((temptosend | write_fifo.source.valid)
& (pads.txe_n == 0)),
]
self.fsmstate = Signal(4)
self.comb += [
self.fsmstate.eq(
Cat(fsm.ongoing("IDLE"), fsm.ongoing("WRITE"),
fsm.ongoing("RDWAIT"), fsm.ongoing("READ")))
]
self.sync.usb += [
If(~fsm.ongoing("READ"),
If(temptoread, If(read_buffer.sink.ready, temptoread.eq(0))))
]
self.comb += [
If(
~fsm.ongoing("READ"),
If(
temptoread,
read_buffer.sink.data.eq(tempreadval),
read_buffer.sink.valid.eq(1),
))
]
fsm.act(
"IDLE", rd_n.eq(1), wr_n.eq(1),
If(
wants_write,
oe_n.eq(1),
NextValue(cnt_write, 0),
NextValue(first_write, 1),
NextState("WRITE"),
).Elif(wants_read, oe_n.eq(0),
NextState("RDWAIT")).Else(oe_n.eq(1), ))
fsm.act(
"WRITE", If(
wants_read,
NextValue(cnt_write, cnt_write + 1),
), NextValue(first_write, 0), rd_n.eq(1),
If(
pads.txe_n, oe_n.eq(1), wr_n.eq(1),
write_fifo.source.ready.eq(0),
If(write_fifo.source.valid & ~first_write,
NextValue(temptosend, 1)),
NextState("IDLE")).Elif(
temptosend, oe_n.eq(1), data_w.eq(tempsendval), wr_n.eq(0),
NextValue(temptosend,
0)).Elif(cnt_write > timeout, oe_n.eq(0),
NextState("RDWAIT")).Elif(
write_fifo.source.valid,
oe_n.eq(1),
data_w.eq(write_fifo.source.data),
write_fifo.source.ready.eq(1),
NextValue(tempsendval,
write_fifo.source.data),
NextValue(temptosend, 0),
wr_n.eq(0),
).Else(oe_n.eq(1), wr_n.eq(1),
NextValue(temptosend, 0),
NextState("IDLE")))
fsm.act("RDWAIT", rd_n.eq(0), oe_n.eq(0), wr_n.eq(1),
NextValue(cnt_read, 0), NextState("READ"))
fsm.act(
"READ", If(
wants_write,
NextValue(cnt_read, cnt_read + 1),
), wr_n.eq(1),
If(
pads.rxf_n,
oe_n.eq(0),
rd_n.eq(1),
NextState("IDLE"),
).Elif(
cnt_read > timeout,
NextValue(cnt_write, 0),
NextValue(first_write, 1),
NextState("WRITE"),
oe_n.eq(1),
).Else(
oe_n.eq(0), read_buffer.sink.valid.eq(1),
read_buffer.sink.data.eq(data_r),
NextValue(tempreadval, data_r),
If(read_buffer.sink.ready,
rd_n.eq(0)).Else(NextValue(temptoread, 1),
NextState("IDLE"), rd_n.eq(1))))