litex-boards/litex_boards/targets/numato_mimas_a7.py

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2020-01-14 23:30:49 -05:00
#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2018-2019 Rohit Singh <rohit@rohitksingh.in>
# Copyright (c) 2020 Feliks Montez <feliks.montez@gmail.com>
# SPDX-License-Identifier: BSD-2-Clause
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from migen import *
from litex.gen import LiteXModule
from litex_boards.platforms import numato_mimas_a7
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from litex.soc.cores.clock import *
from litex.soc.integration.soc_core import *
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from litex.soc.integration.builder import *
from litex.soc.cores.led import LedChaser
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from litedram.modules import MT41J128M16
from litedram.phy import s7ddrphy
from liteeth.phy.s7rgmii import LiteEthPHYRGMII
# CRG ----------------------------------------------------------------------------------------------
class _CRG(LiteXModule):
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def __init__(self, platform, sys_clk_freq):
self.rst = Signal()
self.cd_sys = ClockDomain()
self.cd_sys4x = ClockDomain()
self.cd_sys4x_dqs = ClockDomain()
self.cd_idelay = ClockDomain()
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# # #
self.pll = pll = S7PLL(speedgrade=-1)
self.comb += pll.reset.eq(platform.request("cpu_reset") | self.rst)
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pll.register_clkin(platform.request("clk100"), 100e6)
pll.create_clkout(self.cd_sys, sys_clk_freq)
pll.create_clkout(self.cd_sys4x, 4*sys_clk_freq)
pll.create_clkout(self.cd_sys4x_dqs, 4*sys_clk_freq, phase=90)
pll.create_clkout(self.cd_idelay, 200e6)
platform.add_false_path_constraints(self.cd_sys.clk, pll.clkin) # Ignore sys_clk to pll.clkin path created by SoC's rst.
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self.idelayctrl = S7IDELAYCTRL(self.cd_idelay)
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# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
def __init__(self, sys_clk_freq=int(100e6), with_led_chaser=True, with_ethernet=False,
**kwargs):
platform = numato_mimas_a7.Platform()
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# CRG --------------------------------------------------------------------------------------
self.crg = _CRG(platform, sys_clk_freq)
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# SoCCore ----------------------------------------------------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Mimas A7", **kwargs)
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# DDR3 SDRAM -------------------------------------------------------------------------------
if not self.integrated_main_ram_size:
self.ddrphy = s7ddrphy.A7DDRPHY(platform.request("ddram"),
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memtype = "DDR3",
nphases = 4,
sys_clk_freq = sys_clk_freq)
self.add_sdram("sdram",
phy = self.ddrphy,
module = MT41J128M16(sys_clk_freq, "1:4"),
l2_cache_size = kwargs.get("l2_size", 8192)
)
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# Ethernet ---------------------------------------------------------------------------------
if with_ethernet:
self.ethphy = LiteEthPHYRGMII(
clock_pads = self.platform.request("eth_clocks"),
pads = self.platform.request("eth"))
self.add_ethernet(phy=self.ethphy)
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# Leds -------------------------------------------------------------------------------------
if with_led_chaser:
self.leds = LedChaser(
pads = platform.request_all("user_led"),
sys_clk_freq = sys_clk_freq)
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# Build --------------------------------------------------------------------------------------------
def main():
from litex.build.parser import LiteXArgumentParser
parser = LiteXArgumentParser(platform=numato_mimas_a7.Platform, description="LiteX SoC on Mimas A7")
parser.add_target_argument("--sys-clk-freq", default=100e6, help="System clock frequency.")
parser.add_target_argument("--with-ethernet", action="store_true", help="Enable Ethernet support.")
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args = parser.parse_args()
soc = BaseSoC(
sys_clk_freq = int(float(args.sys_clk_freq)),
with_ethernet = args.with_ethernet,
**parser.soc_core_argdict
)
builder = Builder(soc, **parser.builder_argdict)
if args.build:
builder.build(**parser.toolchain_argdict)
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if args.load:
prog = soc.platform.create_programmer()
prog.load_bitstream(builder.get_bitstream_filename(mode="sram"))
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if __name__ == "__main__":
main()