212 lines
8.5 KiB
Python
Executable File
212 lines
8.5 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
|
|
#
|
|
# This file is part of LiteX-Boards.
|
|
#
|
|
# Copyright (c) 2015 Robert Jordens <jordens@gmail.com>
|
|
# Copyright (c) 2015 Sebastien Bourdeauducq <sb@m-labs.hk>
|
|
# Copyright (c) 2015 Yann Sionneau <yann.sionneau@gmail.com>
|
|
# Copyright (c) 2016-2017 Tim 'mithro' Ansell <mithro@mithis.com>
|
|
# Copyright (c) 2019 Florent Kermarrec <florent@enjoy-digital.fr>
|
|
# SPDX-License-Identifier: BSD-2-Clause
|
|
|
|
from fractions import Fraction
|
|
|
|
from migen import *
|
|
from migen.genlib.resetsync import AsyncResetSynchronizer
|
|
|
|
from litex.gen import LiteXModule
|
|
|
|
from litex_boards.platforms import saanlima_pipistrello
|
|
|
|
from litex.soc.integration.soc_core import *
|
|
from litex.soc.integration.builder import *
|
|
from litex.soc.cores.led import LedChaser
|
|
|
|
from litedram.modules import MT46H32M16
|
|
from litedram.phy import s6ddrphy
|
|
|
|
# CRG ----------------------------------------------------------------------------------------------
|
|
|
|
class _CRG(LiteXModule):
|
|
def __init__(self, platform, sys_clk_freq):
|
|
self.rst = Signal()
|
|
self.cd_sys = ClockDomain()
|
|
self.cd_sdram_half = ClockDomain()
|
|
self.cd_sdram_full_wr = ClockDomain()
|
|
self.cd_sdram_full_rd = ClockDomain()
|
|
|
|
self.reset = Signal()
|
|
|
|
# # #
|
|
|
|
# Input clock ------------------------------------------------------------------------------
|
|
clk50_freq = int(50e6)
|
|
clk50 = platform.request("clk50")
|
|
clk50b = Signal()
|
|
self.specials += Instance("BUFIO2",
|
|
p_DIVIDE=1, p_DIVIDE_BYPASS="TRUE",
|
|
p_I_INVERT="FALSE",
|
|
i_I=clk50, o_DIVCLK=clk50b)
|
|
|
|
# PLL --------------------------------------------------------------------------------------
|
|
pll_lckd = Signal()
|
|
pll_fb = Signal()
|
|
pll_sdram_full = Signal()
|
|
pll_sdram_half_a = Signal()
|
|
pll_sdram_half_b = Signal()
|
|
pll_unused = Signal()
|
|
pll_sys = Signal()
|
|
pll_periph = Signal()
|
|
|
|
p = 12
|
|
f = Fraction(sys_clk_freq*p, clk50_freq)
|
|
n, d = f.numerator, f.denominator
|
|
assert 19e6 <= clk50_freq/d <= 500e6 # pfd
|
|
assert 400e6 <= clk50_freq*n/d <= 1080e6 # vco
|
|
|
|
self.specials.pll = Instance(
|
|
"PLL_ADV",
|
|
name="crg_pll_adv",
|
|
p_SIM_DEVICE="SPARTAN6", p_BANDWIDTH="OPTIMIZED", p_COMPENSATION="INTERNAL",
|
|
p_REF_JITTER=.01,
|
|
i_DADDR=0, i_DCLK=0, i_DEN=0, i_DI=0, i_DWE=0, i_RST=0, i_REL=0,
|
|
p_DIVCLK_DIVIDE=d,
|
|
# Input Clocks (50MHz)
|
|
i_CLKIN1=clk50b,
|
|
p_CLKIN1_PERIOD=1e9/clk50_freq,
|
|
i_CLKIN2=0,
|
|
p_CLKIN2_PERIOD=0.,
|
|
i_CLKINSEL=1,
|
|
# Feedback
|
|
i_CLKFBIN=pll_fb, o_CLKFBOUT=pll_fb, o_LOCKED=pll_lckd,
|
|
p_CLK_FEEDBACK="CLKFBOUT",
|
|
p_CLKFBOUT_MULT=n, p_CLKFBOUT_PHASE=0.,
|
|
# (333MHz) sdram wr rd
|
|
o_CLKOUT0=pll_sdram_full, p_CLKOUT0_DUTY_CYCLE=.5,
|
|
p_CLKOUT0_PHASE=0., p_CLKOUT0_DIVIDE=p//4,
|
|
# unused?
|
|
o_CLKOUT1=pll_unused, p_CLKOUT1_DUTY_CYCLE=.5,
|
|
p_CLKOUT1_PHASE=0., p_CLKOUT1_DIVIDE=15,
|
|
# (166MHz) sdram_half - sdram dqs adr ctrl
|
|
o_CLKOUT2=pll_sdram_half_a, p_CLKOUT2_DUTY_CYCLE=.5,
|
|
p_CLKOUT2_PHASE=270., p_CLKOUT2_DIVIDE=p//2,
|
|
# (166MHz) off-chip ddr
|
|
o_CLKOUT3=pll_sdram_half_b, p_CLKOUT3_DUTY_CYCLE=.5,
|
|
p_CLKOUT3_PHASE=250., p_CLKOUT3_DIVIDE=p//2,
|
|
# ( 50MHz) periph
|
|
o_CLKOUT4=pll_periph, p_CLKOUT4_DUTY_CYCLE=.5,
|
|
p_CLKOUT4_PHASE=0., p_CLKOUT4_DIVIDE=20,
|
|
# ( 83MHz) sysclk
|
|
o_CLKOUT5=pll_sys, p_CLKOUT5_DUTY_CYCLE=.5,
|
|
p_CLKOUT5_PHASE=0., p_CLKOUT5_DIVIDE=p//1,
|
|
)
|
|
|
|
# Power on reset
|
|
reset = platform.request("user_btn") | self.reset | self.rst
|
|
self.cd_por = ClockDomain()
|
|
por = Signal(max=1 << 11, reset=(1 << 11) - 1)
|
|
self.sync.por += If(por != 0, por.eq(por - 1))
|
|
self.specials += AsyncResetSynchronizer(self.cd_por, reset)
|
|
|
|
# System clock
|
|
self.specials += Instance("BUFG", i_I=pll_sys, o_O=self.cd_sys.clk)
|
|
self.comb += self.cd_por.clk.eq(self.cd_sys.clk)
|
|
self.specials += AsyncResetSynchronizer(self.cd_sys, ~pll_lckd | (por > 0))
|
|
platform.add_period_constraint(self.cd_sys.clk, 1e9/sys_clk_freq)
|
|
|
|
# SDRAM clocks -----------------------------------------------------------------------------
|
|
self.clk4x_wr_strb = Signal()
|
|
self.clk4x_rd_strb = Signal()
|
|
|
|
# SDRAM full clock
|
|
self.specials += Instance("BUFPLL", name="sdram_full_bufpll",
|
|
p_DIVIDE = 4,
|
|
i_PLLIN = pll_sdram_full, i_GCLK=self.cd_sys.clk,
|
|
i_LOCKED = pll_lckd,
|
|
o_IOCLK = self.cd_sdram_full_wr.clk,
|
|
o_SERDESSTROBE = self.clk4x_wr_strb)
|
|
self.comb += [
|
|
self.cd_sdram_full_rd.clk.eq(self.cd_sdram_full_wr.clk),
|
|
self.clk4x_rd_strb.eq(self.clk4x_wr_strb),
|
|
]
|
|
# SDRAM_half clock
|
|
self.specials += Instance("BUFG", name="sdram_half_a_bufpll",
|
|
i_I=pll_sdram_half_a, o_O=self.cd_sdram_half.clk)
|
|
clk_sdram_half_shifted = Signal()
|
|
self.specials += Instance("BUFG", name="sdram_half_b_bufpll",
|
|
i_I=pll_sdram_half_b, o_O=clk_sdram_half_shifted)
|
|
clk = platform.request("ddram_clock")
|
|
self.specials += Instance("ODDR2", p_DDR_ALIGNMENT="NONE",
|
|
p_INIT=0, p_SRTYPE="SYNC",
|
|
i_D0=1, i_D1=0, i_S=0, i_R=0, i_CE=1,
|
|
i_C0=clk_sdram_half_shifted,
|
|
i_C1=~clk_sdram_half_shifted,
|
|
o_Q=clk.p)
|
|
self.specials += Instance("ODDR2", p_DDR_ALIGNMENT="NONE",
|
|
p_INIT=0, p_SRTYPE="SYNC",
|
|
i_D0=0, i_D1=1, i_S=0, i_R=0, i_CE=1,
|
|
i_C0=clk_sdram_half_shifted,
|
|
i_C1=~clk_sdram_half_shifted,
|
|
o_Q=clk.n)
|
|
|
|
# BaseSoC ------------------------------------------------------------------------------------------
|
|
|
|
class BaseSoC(SoCCore):
|
|
def __init__(self, with_led_chaser=True, **kwargs):
|
|
sys_clk_freq = (83 + Fraction(1, 3))*1000*1000
|
|
platform = saanlima_pipistrello.Platform()
|
|
|
|
# CRG --------------------------------------------------------------------------------------
|
|
self.crg = _CRG(platform, sys_clk_freq)
|
|
|
|
# SoCCore ----------------------------------------------------------------------------------
|
|
SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Pipistrello", **kwargs)
|
|
|
|
# LPDDR SDRAM ------------------------------------------------------------------------------
|
|
if not self.integrated_main_ram_size:
|
|
self.ddrphy = s6ddrphy.S6HalfRateDDRPHY(platform.request("ddram"),
|
|
memtype = "LPDDR",
|
|
rd_bitslip = 1,
|
|
wr_bitslip = 3,
|
|
dqs_ddr_alignment = "C1")
|
|
self.comb += [
|
|
self.ddrphy.clk4x_wr_strb.eq(self.crg.clk4x_wr_strb),
|
|
self.ddrphy.clk4x_rd_strb.eq(self.crg.clk4x_rd_strb),
|
|
]
|
|
self.add_sdram("sdram",
|
|
phy = self.ddrphy,
|
|
module = MT46H32M16(sys_clk_freq, "1:2"),
|
|
l2_cache_size = kwargs.get("l2_size", 8192)
|
|
)
|
|
|
|
# Leds -------------------------------------------------------------------------------------
|
|
if with_led_chaser:
|
|
self.leds = LedChaser(
|
|
pads = platform.request_all("user_led"),
|
|
sys_clk_freq = sys_clk_freq)
|
|
|
|
# Build --------------------------------------------------------------------------------------------
|
|
|
|
def main():
|
|
from litex.soc.integration.soc import LiteXSoCArgumentParser
|
|
parser = LiteXSoCArgumentParser(description="LiteX SoC on Pipistrello")
|
|
target_group = parser.add_argument_group(title="Target options")
|
|
target_group.add_argument("--build", action="store_true", help="Build design.")
|
|
target_group.add_argument("--load", action="store_true", help="Load bitstream.")
|
|
builder_args(parser)
|
|
soc_core_args(parser)
|
|
args = parser.parse_args()
|
|
|
|
soc = BaseSoC(**soc_core_argdict(args))
|
|
builder = Builder(soc, **builder_argdict(args))
|
|
if args.build:
|
|
builder.build()
|
|
|
|
if args.load:
|
|
prog = soc.platform.create_programmer()
|
|
prog.load_bitstream(builder.get_bitstream_filename(mode="sram"))
|
|
|
|
if __name__ == "__main__":
|
|
main()
|