litex-boards/litex_boards/targets/kx2.py

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#!/usr/bin/env python3
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# This file is Copyright (c) 2020 Mark Standke <mstandke@cern.ch>
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# License: BSD
import argparse
from migen import *
from litex.boards.platforms import kx2
from litex.soc.cores.clock import *
from litex.soc.integration.soc_sdram import *
from litex.soc.integration.builder import *
from litedram.modules import H5TC4G63CFR
from litedram.phy import s7ddrphy
# CRG ----------------------------------------------------------------------------------------------
class _CRG(Module):
def __init__(self, platform, sys_clk_freq):
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self.clock_domains.cd_sys = ClockDomain()
self.clock_domains.cd_sys4x = ClockDomain(reset_less=True)
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self.clock_domains.cd_clk200 = ClockDomain()
# # #
self.submodules.pll = pll = S7MMCM(speedgrade=-2)
self.comb += pll.reset.eq(~platform.request("cpu_reset_n"))
pll.register_clkin(platform.request("clk200"), 200e6)
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pll.create_clkout(self.cd_sys, sys_clk_freq)
pll.create_clkout(self.cd_sys4x, 4*sys_clk_freq)
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pll.create_clkout(self.cd_clk200, 200e6)
self.submodules.idelayctrl = S7IDELAYCTRL(self.cd_clk200)
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCSDRAM):
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def __init__(self, sys_clk_freq=int(125e6), **kwargs):
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platform = kx2.Platform()
# SoCSDRAM ---------------------------------------------------------------------------------
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SoCSDRAM.__init__(self, platform, clk_freq=sys_clk_freq, **kwargs)
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# CRG --------------------------------------------------------------------------------------
self.submodules.crg = _CRG(platform, sys_clk_freq)
# DDR3 SDRAM -------------------------------------------------------------------------------
if not self.integrated_main_ram_size:
self.submodules.ddrphy = s7ddrphy.K7DDRPHY(platform.request("ddram"),
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memtype = "DDR3",
nphases = 4,
sys_clk_freq = sys_clk_freq)
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self.add_csr("ddrphy")
sdram_module = H5TC4G63CFR(sys_clk_freq, "1:4")
self.register_sdram(self.ddrphy,
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geom_settings = sdram_module.geom_settings,
timing_settings = sdram_module.timing_settings)
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# Build --------------------------------------------------------------------------------------------
def main():
parser = argparse.ArgumentParser(description="LiteX SoC on KX2")
builder_args(parser)
soc_sdram_args(parser)
args = parser.parse_args()
soc = BaseSoC(**soc_sdram_argdict(args))
builder = Builder(soc, **builder_argdict(args))
builder.build()
if __name__ == "__main__":
main()