84 lines
2.6 KiB
Python
84 lines
2.6 KiB
Python
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#
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# This file is part of LiteX-Boards.
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#
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# Copyright (c) 2021 Florent Kermarrec <florent@enjoy-digital.fr>
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# SPDX-License-Identifier: BSD-2-Clause
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# Board diagram/pinout:
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# http://www.fabienm.eu/flf/wp-content/uploads/2021/08/Tang-Nano-4K-specifications.jpg
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# http://www.fabienm.eu/flf/wp-content/uploads/2021/08/Tang-Nano-4K-GW1NSR-4C-FPGA-board-pinout-diagram.jpg
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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.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("52"), IOStandard("LVCMOS33")),
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# Leds
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("user_led", 0, Pins("10"), IOStandard("LVCMOS18")),
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("user_led", 1, Pins("11"), IOStandard("LVCMOS18")),
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("user_led", 2, Pins("13"), IOStandard("LVCMOS18")),
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("user_led", 3, Pins("14"), IOStandard("LVCMOS18")),
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("user_led", 4, Pins("15"), IOStandard("LVCMOS18")),
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("user_led", 5, Pins("16"), IOStandard("LVCMOS18")),
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# Buttons.
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("user_btn", 0, Pins("3"), IOStandard("LVCMOS18")),
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("user_btn", 1, Pins("4"), IOStandard("LVCMOS18")),
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# Serial
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("serial", 0,
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Subsignal("rx", Pins("18")),
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Subsignal("tx", Pins("17")),
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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("60"), IOStandard("LVCMOS33")),
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Subsignal("clk", Pins("59"), IOStandard("LVCMOS33")),
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Subsignal("miso", Pins("62"), IOStandard("LVCMOS33")),
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Subsignal("mosi", Pins("61"), IOStandard("LVCMOS33")),
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),
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("spisdcard", 0,
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Subsignal("clk", Pins("36")),
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Subsignal("mosi", Pins("37")),
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Subsignal("cs_n", Pins("38")),
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Subsignal("miso", Pins("39")),
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IOStandard("LVCMOS33"),
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),
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# TODO: SPI/RGB LCD, copackaged PSRAM
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]
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# Connectors ---------------------------------------------------------------------------------------
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_connectors = [
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# TODO
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]
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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):
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GowinPlatform.__init__(self, "GW1NR-LV9QN88PC6/I5", _io, _connectors, toolchain="gowin", devicename="GW1NR-9C")
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self.toolchain.options["use_mspi_as_gpio"] = 1
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def create_programmer(self):
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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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