Gateware: WRPLL
ddmtd: add DDMTD and deglitcher wrpll: add helper clockdomain wrpll: add frequency counter wrpll: add skewtester wrpll: add gtx & main tag collection wrpll: add gtx & main tag eventmanager for shared peripheral interrupt wrpll: add SMA frequency multiplier to generate 125Mhz refclk si549: add i2c and adpll programmer
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67
src/gateware/ddmtd.py
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67
src/gateware/ddmtd.py
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from migen import *
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from migen.genlib.cdc import PulseSynchronizer, MultiReg
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from misoc.interconnect.csr import *
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class DDMTDSampler(Module):
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def __init__(self, cd_ref, main_clk_se):
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self.ref_beating = Signal()
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self.main_beating = Signal()
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# # #
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ref_beating_FF = Signal()
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main_beating_FF = Signal()
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self.specials += [
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# Two back to back FFs are used to prevent metastability
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Instance("FD", i_C=ClockSignal("helper"),
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i_D=cd_ref.clk, o_Q=ref_beating_FF),
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Instance("FD", i_C=ClockSignal("helper"),
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i_D=ref_beating_FF, o_Q=self.ref_beating),
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Instance("FD", i_C=ClockSignal("helper"),
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i_D=main_clk_se, o_Q=main_beating_FF),
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Instance("FD", i_C=ClockSignal("helper"),
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i_D=main_beating_FF, o_Q=self.main_beating)
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]
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class DDMTDDeglitcherFirstEdge(Module):
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def __init__(self, input_signal, blind_period=400):
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self.detect = Signal()
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rising = Signal()
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input_signal_r = Signal()
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# # #
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self.sync.helper += [
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input_signal_r.eq(input_signal),
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rising.eq(input_signal & ~input_signal_r)
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]
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blind_counter = Signal(max=blind_period)
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self.sync.helper += [
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If(blind_counter != 0, blind_counter.eq(blind_counter - 1)),
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If(input_signal_r, blind_counter.eq(blind_period - 1)),
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self.detect.eq(rising & (blind_counter == 0))
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]
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class DDMTD(Module):
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def __init__(self, counter, input_signal):
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# in helper clock domain
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self.h_tag = Signal(len(counter))
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self.h_tag_update = Signal()
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# # #
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deglitcher = DDMTDDeglitcherFirstEdge(input_signal)
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self.submodules += deglitcher
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self.sync.helper += [
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self.h_tag_update.eq(0),
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If(deglitcher.detect,
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self.h_tag_update.eq(1),
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self.h_tag.eq(counter)
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)
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]
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277
src/gateware/si549.py
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277
src/gateware/si549.py
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from migen import *
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from migen.genlib.fsm import *
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from misoc.interconnect.csr import *
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class I2CClockGen(Module):
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def __init__(self, width):
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self.load = Signal(width)
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self.clk2x = Signal()
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cnt = Signal.like(self.load)
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self.comb += [
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self.clk2x.eq(cnt == 0),
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]
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self.sync += [
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If(self.clk2x,
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cnt.eq(self.load),
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).Else(
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cnt.eq(cnt - 1),
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)
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]
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class I2CMasterMachine(Module):
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def __init__(self, clock_width):
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self.scl = Signal(reset=1)
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self.sda_o = Signal(reset=1)
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self.sda_i = Signal()
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self.submodules.cg = CEInserter()(I2CClockGen(clock_width))
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self.start = Signal()
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self.stop = Signal()
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self.write = Signal()
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self.ack = Signal()
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self.data = Signal(8)
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self.ready = Signal()
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# # #
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bits = Signal(4)
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data = Signal(8)
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fsm = CEInserter()(FSM("IDLE"))
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self.submodules += fsm
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fsm.act("IDLE",
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self.ready.eq(1),
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If(self.start,
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NextState("START0"),
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).Elif(self.stop,
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NextState("STOP0"),
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).Elif(self.write,
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NextValue(bits, 8),
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NextValue(data, self.data),
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NextState("WRITE0")
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)
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)
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fsm.act("START0",
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NextValue(self.scl, 1),
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NextState("START1")
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)
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fsm.act("START1",
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NextValue(self.sda_o, 0),
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NextState("IDLE")
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)
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fsm.act("STOP0",
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NextValue(self.scl, 0),
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NextState("STOP1")
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)
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fsm.act("STOP1",
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NextValue(self.sda_o, 0),
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NextState("STOP2")
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)
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fsm.act("STOP2",
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NextValue(self.scl, 1),
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NextState("STOP3")
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)
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fsm.act("STOP3",
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NextValue(self.sda_o, 1),
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NextState("IDLE")
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)
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fsm.act("WRITE0",
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NextValue(self.scl, 0),
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NextState("WRITE1")
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)
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fsm.act("WRITE1",
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If(bits == 0,
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NextValue(self.sda_o, 1),
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NextState("READACK0"),
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).Else(
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NextValue(self.sda_o, data[7]),
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NextState("WRITE2"),
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)
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)
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fsm.act("WRITE2",
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NextValue(self.scl, 1),
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NextValue(data[1:], data[:-1]),
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NextValue(bits, bits - 1),
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NextState("WRITE0"),
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)
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fsm.act("READACK0",
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NextValue(self.scl, 1),
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NextState("READACK1"),
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)
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fsm.act("READACK1",
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NextValue(self.ack, ~self.sda_i),
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NextState("IDLE")
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)
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run = Signal()
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idle = Signal()
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self.comb += [
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run.eq((self.start | self.stop | self.write) & self.ready),
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idle.eq(~run & fsm.ongoing("IDLE")),
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self.cg.ce.eq(~idle),
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fsm.ce.eq(run | self.cg.clk2x),
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]
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class ADPLLProgrammer(Module):
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def __init__(self):
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self.i2c_divider = Signal(16)
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self.i2c_address = Signal(7)
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self.adpll = Signal(24)
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self.stb = Signal()
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self.busy = Signal()
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self.nack = Signal()
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self.scl = Signal()
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self.sda_i = Signal()
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self.sda_o = Signal()
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# # #
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master = I2CMasterMachine(16)
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self.submodules += master
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self.comb += [
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master.cg.load.eq(self.i2c_divider),
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self.scl.eq(master.scl),
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master.sda_i.eq(self.sda_i),
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self.sda_o.eq(master.sda_o)
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]
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fsm = FSM()
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self.submodules += fsm
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fsm.act("IDLE",
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If(self.stb,
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NextValue(self.nack, 0),
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NextState("START")
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)
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)
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fsm.act("START",
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master.start.eq(1),
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If(master.ready, NextState("DEVADDRESS"))
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)
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fsm.act("DEVADDRESS",
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master.data.eq(self.i2c_address << 1),
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master.write.eq(1),
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If(master.ready, NextState("REGADRESS"))
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)
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fsm.act("REGADRESS",
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master.data.eq(231),
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master.write.eq(1),
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If(master.ready,
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If(master.ack,
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NextState("DATA0")
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).Else(
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NextValue(self.nack, 1),
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NextState("STOP")
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)
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)
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)
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fsm.act("DATA0",
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master.data.eq(self.adpll[0:8]),
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master.write.eq(1),
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If(master.ready,
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If(master.ack,
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NextState("DATA1")
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).Else(
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NextValue(self.nack, 1),
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NextState("STOP")
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)
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)
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)
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fsm.act("DATA1",
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master.data.eq(self.adpll[8:16]),
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master.write.eq(1),
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If(master.ready,
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If(master.ack,
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NextState("DATA2")
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).Else(
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NextValue(self.nack, 1),
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NextState("STOP")
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)
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)
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)
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fsm.act("DATA2",
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master.data.eq(self.adpll[16:24]),
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master.write.eq(1),
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If(master.ready,
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If(~master.ack, NextValue(self.nack, 1)),
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NextState("STOP")
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)
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)
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fsm.act("STOP",
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master.stop.eq(1),
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If(master.ready,
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If(~master.ack, NextValue(self.nack, 1)),
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NextState("IDLE")
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)
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)
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self.comb += self.busy.eq(~fsm.ongoing("IDLE"))
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class Si549(Module, AutoCSR):
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def __init__(self, pads):
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self.i2c_divider = CSRStorage(16, reset=75)
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self.i2c_address = CSRStorage(7)
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self.adpll = CSRStorage(24)
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self.adpll_stb = CSR()
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self.adpll_busy = CSRStatus()
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self.nack = CSRStatus()
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self.bitbang_enable = CSRStorage()
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self.sda_oe = CSRStorage()
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self.sda_out = CSRStorage()
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self.sda_in = CSRStatus()
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self.scl_oe = CSRStorage()
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self.scl_out = CSRStorage()
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# # #
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self.submodules.programmer = ADPLLProgrammer()
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self.sync += self.programmer.stb.eq(self.adpll_stb.re)
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self.comb += [
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self.programmer.i2c_divider.eq(self.i2c_divider.storage),
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self.programmer.i2c_address.eq(self.i2c_address.storage),
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self.programmer.adpll.eq(self.adpll.storage),
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self.adpll_busy.status.eq(self.programmer.busy),
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self.nack.status.eq(self.programmer.nack)
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]
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# I2C with bitbang/gateware mode select
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sda_t = TSTriple(1)
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scl_t = TSTriple(1)
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self.specials += [
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sda_t.get_tristate(pads.sda),
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scl_t.get_tristate(pads.scl)
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]
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self.comb += [
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If(self.bitbang_enable.storage,
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sda_t.oe.eq(self.sda_oe.storage),
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sda_t.o.eq(self.sda_out.storage),
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self.sda_in.status.eq(sda_t.i),
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scl_t.oe.eq(self.scl_oe.storage),
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scl_t.o.eq(self.scl_out.storage)
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).Else(
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sda_t.oe.eq(~self.programmer.sda_o),
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sda_t.o.eq(0),
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self.programmer.sda_i.eq(sda_t.i),
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scl_t.oe.eq(~self.programmer.scl),
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scl_t.o.eq(0),
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)
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]
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237
src/gateware/wrpll.py
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237
src/gateware/wrpll.py
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@ -0,0 +1,237 @@
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from migen import *
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from migen.genlib.cdc import MultiReg, AsyncResetSynchronizer, PulseSynchronizer
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from misoc.interconnect.csr import *
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from misoc.interconnect.csr_eventmanager import *
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from ddmtd import DDMTDSampler, DDMTD
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from si549 import Si549
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class FrequencyCounter(Module, AutoCSR):
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def __init__(self, domains, counter_width=24):
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self.update = CSR()
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self.busy = CSRStatus()
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counter_reset = Signal()
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counter_stb = Signal()
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timer = Signal(counter_width)
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# # #
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fsm = FSM()
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self.submodules += fsm
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fsm.act("IDLE",
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counter_reset.eq(1),
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If(self.update.re,
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NextValue(timer, 2**counter_width - 1),
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NextState("COUNTING")
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)
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)
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fsm.act("COUNTING",
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self.busy.status.eq(1),
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If(timer != 0,
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NextValue(timer, timer - 1)
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).Else(
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counter_stb.eq(1),
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NextState("IDLE")
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)
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)
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for domain in domains:
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name = "counter_" + domain
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counter_csr = CSRStatus(counter_width, name=name)
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setattr(self, name, counter_csr)
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divider = Signal(2)
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divided = Signal()
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divided_sys = Signal()
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divided_sys_r = Signal()
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divided_tick = Signal()
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counter = Signal(counter_width)
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# # #
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sync_domain = getattr(self.sync, domain)
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sync_domain +=[
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divider.eq(divider + 1),
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divided.eq(divider[-1])
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]
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self.specials += MultiReg(divided, divided_sys)
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self.sync += divided_sys_r.eq(divided_sys)
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self.comb += divided_tick.eq(divided_sys & ~divided_sys_r)
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self.sync += [
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If(counter_stb, counter_csr.status.eq(counter)),
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If(divided_tick, counter.eq(counter + 1)),
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If(counter_reset, counter.eq(0))
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]
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class SkewTester(Module, AutoCSR):
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def __init__(self, rx_synchronizer):
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self.error = CSR()
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# # #
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# The RX synchronizer is tested for setup/hold violations by feeding it a
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# toggling pattern and checking that the same toggling pattern comes out.
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toggle_in = Signal()
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self.sync.rtio_rx0 += toggle_in.eq(~toggle_in)
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toggle_out = rx_synchronizer.resync(toggle_in)
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toggle_out_expected = Signal()
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self.sync += toggle_out_expected.eq(~toggle_out)
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error = Signal()
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self.sync += [
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If(toggle_out != toggle_out_expected, error.eq(1)),
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If(self.error.re, error.eq(0))
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]
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self.specials += MultiReg(error, self.error.w)
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class WRPLL(Module, AutoCSR):
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def __init__(self, platform, cd_ref, main_clk_se, COUNTER_BIT=32):
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self.helper_reset = CSRStorage(reset=1)
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self.ref_tag = CSRStatus(COUNTER_BIT)
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self.main_tag = CSRStatus(COUNTER_BIT)
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ddmtd_counter = Signal(COUNTER_BIT)
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ref_tag_sys = Signal(COUNTER_BIT)
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main_tag_sys = Signal(COUNTER_BIT)
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ref_tag_stb_sys = Signal()
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main_tag_stb_sys = Signal()
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# # #
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self.submodules.main_dcxo = Si549(platform.request("ddmtd_main_dcxo_i2c"))
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self.submodules.helper_dcxo = Si549(platform.request("ddmtd_helper_dcxo_i2c"))
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helper_dcxo_pads = platform.request("ddmtd_helper_clk")
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self.clock_domains.cd_helper = ClockDomain()
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self.specials += [
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Instance("IBUFGDS",
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i_I=helper_dcxo_pads.p, i_IB=helper_dcxo_pads.n,
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o_O=self.cd_helper.clk),
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AsyncResetSynchronizer(self.cd_helper, self.helper_reset.storage)
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]
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self.submodules.frequency_counter = FrequencyCounter(["sys", cd_ref.name])
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self.submodules.ddmtd_sampler = DDMTDSampler(cd_ref, main_clk_se)
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self.sync.helper += ddmtd_counter.eq(ddmtd_counter + 1)
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self.submodules.ddmtd_ref = DDMTD(ddmtd_counter, self.ddmtd_sampler.ref_beating)
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self.submodules.ddmtd_main = DDMTD(ddmtd_counter, self.ddmtd_sampler.main_beating)
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# DDMTD tags collection
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self.specials += [
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MultiReg(self.ddmtd_ref.h_tag, ref_tag_sys),
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MultiReg(self.ddmtd_main.h_tag, main_tag_sys)
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]
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ref_tag_stb_ps = PulseSynchronizer("helper", "sys")
|
||||
main_tag_stb_ps = PulseSynchronizer("helper", "sys")
|
||||
self.submodules += [
|
||||
ref_tag_stb_ps,
|
||||
main_tag_stb_ps
|
||||
]
|
||||
self.sync.helper += [
|
||||
ref_tag_stb_ps.i.eq(self.ddmtd_ref.h_tag_update),
|
||||
main_tag_stb_ps.i.eq(self.ddmtd_main.h_tag_update)
|
||||
]
|
||||
self.sync += [
|
||||
ref_tag_stb_sys.eq(ref_tag_stb_ps.o),
|
||||
main_tag_stb_sys.eq(main_tag_stb_ps.o)
|
||||
]
|
||||
|
||||
self.sync += [
|
||||
If(ref_tag_stb_sys,
|
||||
self.ref_tag.status.eq(ref_tag_sys),
|
||||
),
|
||||
If(main_tag_stb_sys,
|
||||
self.main_tag.status.eq(main_tag_sys)
|
||||
)
|
||||
]
|
||||
|
||||
# EventMangers for firmware interrupt
|
||||
|
||||
self.submodules.ref_tag_ev = EventManager()
|
||||
self.ref_tag_ev.stb = EventSourcePulse()
|
||||
self.ref_tag_ev.finalize()
|
||||
|
||||
self.submodules.main_tag_ev = EventManager()
|
||||
self.main_tag_ev.stb = EventSourcePulse()
|
||||
self.main_tag_ev.finalize()
|
||||
|
||||
self.sync += [
|
||||
self.ref_tag_ev.stb.trigger.eq(ref_tag_stb_sys),
|
||||
self.main_tag_ev.stb.trigger.eq(main_tag_stb_sys)
|
||||
]
|
||||
|
||||
self.submodules.ev = SharedIRQ(self.ref_tag_ev, self.main_tag_ev)
|
||||
|
||||
|
||||
class SMAFrequencyMultiplier(Module, AutoCSR):
|
||||
def __init__(self, sma_clkin):
|
||||
sma_clkin_se = Signal()
|
||||
mmcm_locked = Signal()
|
||||
mmcm_fb_clk = Signal()
|
||||
ref_clk = Signal()
|
||||
self.clock_domains.cd_ref = ClockDomain()
|
||||
self.refclk_reset = CSRStorage(reset=1)
|
||||
|
||||
self.mmcm_bypass = CSRStorage()
|
||||
self.mmcm_locked = CSRStatus()
|
||||
self.mmcm_reset = CSRStorage(reset=1)
|
||||
|
||||
self.mmcm_daddr = CSRStorage(7)
|
||||
self.mmcm_din = CSRStorage(16)
|
||||
self.mmcm_dwen = CSRStorage()
|
||||
self.mmcm_den = CSRStorage()
|
||||
self.mmcm_dclk = CSRStorage()
|
||||
self.mmcm_dout = CSRStatus(16)
|
||||
self.mmcm_dready = CSRStatus()
|
||||
|
||||
# # #
|
||||
|
||||
self.specials += [
|
||||
Instance("IBUFDS",
|
||||
i_I=sma_clkin.p, i_IB=sma_clkin.n,
|
||||
o_O=sma_clkin_se),
|
||||
# MMCME2 is capable to accept 10MHz input while PLLE2 only support down to 19MHz input (DS191)
|
||||
# The MMCME2 can be reconfiged during runtime using the Dynamic Reconfiguration Ports
|
||||
Instance("MMCME2_ADV",
|
||||
p_BANDWIDTH="LOW", # lower jitter
|
||||
o_LOCKED=self.mmcm_locked.status,
|
||||
i_RST=self.mmcm_reset.storage,
|
||||
|
||||
p_CLKIN1_PERIOD=8, # ns
|
||||
i_CLKIN1=sma_clkin_se,
|
||||
i_CLKINSEL=1, # 1=CLKIN1 0=CLKIN2
|
||||
|
||||
# VCO @ 1.25GHz
|
||||
p_CLKFBOUT_MULT_F=10, p_DIVCLK_DIVIDE=1,
|
||||
i_CLKFBIN=mmcm_fb_clk, o_CLKFBOUT=mmcm_fb_clk,
|
||||
|
||||
# 125MHz for WRPLL
|
||||
p_CLKOUT0_DIVIDE_F=10, p_CLKOUT0_PHASE=0.0, o_CLKOUT0=ref_clk,
|
||||
|
||||
# Dynamic Reconfiguration Ports
|
||||
i_DADDR = self.mmcm_daddr.storage,
|
||||
i_DI = self.mmcm_din.storage,
|
||||
i_DWE = self.mmcm_dwen.storage,
|
||||
i_DEN = self.mmcm_den.storage,
|
||||
i_DCLK = self.mmcm_dclk.storage,
|
||||
o_DO = self.mmcm_dout.status,
|
||||
o_DRDY = self.mmcm_dready.status
|
||||
),
|
||||
Instance("BUFGMUX",
|
||||
i_I0=ref_clk,
|
||||
i_I1=sma_clkin_se,
|
||||
i_S=self.mmcm_bypass.storage,
|
||||
o_O=self.cd_ref.clk
|
||||
),
|
||||
AsyncResetSynchronizer(self.cd_ref, self.refclk_reset.storage),
|
||||
]
|
||||
Loading…
Reference in New Issue
Block a user