107 lines
3.6 KiB
Python
107 lines
3.6 KiB
Python
#
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# This file is part of LiteX-Boards.
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#
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# Copyright (c) 2023 Icenowy Zheng <uwu@icenowy.me>
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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("4"), IOStandard("LVCMOS33")),
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# Serial.
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("serial", 0,
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Subsignal("rx", Pins("70")),
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Subsignal("tx", Pins("69")),
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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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# SDCard.
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("spisdcard", 0,
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Subsignal("clk", Pins("83")),
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Subsignal("mosi", Pins("82")),
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Subsignal("cs_n", Pins("81")),
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Subsignal("miso", Pins("84")),
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IOStandard("LVCMOS33"),
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),
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("sdcard", 0,
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Subsignal("data", Pins("84 85 80 81")),
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Subsignal("cmd", Pins("82")),
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Subsignal("clk", Pins("83")),
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IOStandard("LVCMOS33"),
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),
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# Leds
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("led_n", 0, Pins("15"), IOStandard("LVCMOS33")),
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("led_n", 1, Pins("16"), IOStandard("LVCMOS33")),
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("led_n", 2, Pins("17"), IOStandard("LVCMOS33")),
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("led_n", 3, Pins("18"), IOStandard("LVCMOS33")),
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("led_n", 4, Pins("19"), IOStandard("LVCMOS33")),
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("led_n", 5, Pins("20"), IOStandard("LVCMOS33")),
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# RGB Led.
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("rgb_led", 0, Pins("79"), IOStandard("LVCMOS33")),
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# Buttons.
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("btn", 0, Pins("88"), IOStandard("LVCMOS33")),
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("btn", 1, Pins("87"), IOStandard("LVCMOS33")),
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# SDRAM (embedded in SIP, requires specific IO naming)
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("O_sdram_clk", 0, Pins(1), IOStandard("LVCMOS33")),
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("O_sdram_cke", 0, Pins(1), IOStandard("LVCMOS33")),
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("O_sdram_cs_n", 0, Pins(1), IOStandard("LVCMOS33")),
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("O_sdram_cas_n", 0, Pins(1), IOStandard("LVCMOS33")),
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("O_sdram_ras_n", 0, Pins(1), IOStandard("LVCMOS33")),
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("O_sdram_wen_n", 0, Pins(1), IOStandard("LVCMOS33")),
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("O_sdram_dqm", 0, Pins(4), IOStandard("LVCMOS33")),
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("O_sdram_addr", 0, Pins(11), IOStandard("LVCMOS33")),
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("O_sdram_ba", 0, Pins(2), IOStandard("LVCMOS33")),
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("IO_sdram_dq", 0, Pins(32), IOStandard("LVCMOS33")),
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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, dock="standard", toolchain="gowin"):
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GowinPlatform.__init__(self, "GW2AR-LV18QN88C8/I7", _io, _connectors, toolchain=toolchain, devicename="GW2AR-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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self.toolchain.options["use_ready_as_gpio"] = 1
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self.toolchain.options["use_done_as_gpio"] = 1
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self.toolchain.options["rw_check_on_ram"] = 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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