74 lines
2.3 KiB
Python
74 lines
2.3 KiB
Python
#
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# This file is part of LiteX-Boards.
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#
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# Copyright (c) 2022 Icenowy Zheng <icenowy@aosc.io>
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# SPDX-License-Identifier: BSD-2-Clause
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from migen import *
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from litex.build.generic_platform import *
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from litex.build.gowin.platform import GowinPlatform
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from litex.build.gowin.programmer import GowinProgrammer
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from litex.build.openfpgaloader import OpenFPGALoader
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# IOs ----------------------------------------------------------------------------------------------
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_io = [
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# Clk / Rst
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("clk27", 0, Pins("H11"), IOStandard("LVCMOS33")),
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# Serial
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("serial", 0,
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Subsignal("rx", Pins("T13")),
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Subsignal("tx", Pins("M11")),
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IOStandard("LVCMOS33")
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),
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# SPIFlash
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("spiflash", 0,
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Subsignal("cs_n", Pins("M9"), IOStandard("LVCMOS33")),
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Subsignal("clk", Pins("L10"), IOStandard("LVCMOS33")),
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Subsignal("miso", Pins("P10"), IOStandard("LVCMOS33")),
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Subsignal("mosi", Pins("R10"), IOStandard("LVCMOS33")),
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),
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# SDCard
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("spisdcard", 0,
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Subsignal("clk", Pins("N10")),
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Subsignal("mosi", Pins("R14")),
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Subsignal("cs_n", Pins("N11")),
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Subsignal("miso", Pins("M8")),
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IOStandard("LVCMOS33"),
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),
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("sdcard", 0,
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Subsignal("data", Pins("M8 M7 M10 N11")),
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Subsignal("cmd", Pins("R14")),
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Subsignal("clk", Pins("N10")),
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Subsignal("cd", Pins("D15")),
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IOStandard("LVCMOS33"),
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),
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]
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# Connectors ---------------------------------------------------------------------------------------
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_connectors = []
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# Platform -----------------------------------------------------------------------------------------
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class Platform(GowinPlatform):
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default_clk_name = "clk27"
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default_clk_period = 1e9/27e6
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def __init__(self, toolchain="gowin"):
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GowinPlatform.__init__(self, "GW2A-LV18PG256C8/I7", _io, _connectors, toolchain=toolchain, devicename="GW2A-18C")
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self.toolchain.options["use_mspi_as_gpio"] = 1
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self.toolchain.options["use_sspi_as_gpio"] = 1
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def create_programmer(self, kit="openfpgaloader"):
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return OpenFPGALoader(cable="ft2232")
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def do_finalize(self, fragment):
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GowinPlatform.do_finalize(self, fragment)
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self.add_period_constraint(self.lookup_request("clk27", loose=True), 1e9/27e6)
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