litex-boards/litex_boards/platforms/sipeed_tang_nano.py

61 lines
1.9 KiB
Python

#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2021 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause
# Board diagram/pinout:
# https://user-images.githubusercontent.com/1450143/133655492-532d5e9a-0635-4889-85c9-68683d06cae0.png
# http://dl.sipeed.com/TANG/Nano/HDK/Tang-NANO-2704(Schematic).pdf
from migen import *
from litex.build.generic_platform import *
from litex.build.gowin.platform import GowinPlatform
from litex.build.openfpgaloader import OpenFPGALoader
# IOs ----------------------------------------------------------------------------------------------
_io = [
# Clk / Rst
("clk24", 0, Pins("35"), IOStandard("LVCMOS33")),
# Leds
("user_led", 0, Pins("16"), IOStandard("LVCMOS33")),
("user_led", 1, Pins("17"), IOStandard("LVCMOS33")),
("user_led", 2, Pins("18"), IOStandard("LVCMOS33")),
# Buttons.
("user_btn", 0, Pins("15"), IOStandard("LVCMOS33")),
("user_btn", 1, Pins("14"), IOStandard("LVCMOS33")),
# Serial
("serial", 0,
Subsignal("tx", Pins("8")),
Subsignal("rx", Pins("9")),
IOStandard("LVCMOS33")
),
]
# Connectors ---------------------------------------------------------------------------------------
_connectors = []
# Platform -----------------------------------------------------------------------------------------
class Platform(GowinPlatform):
default_clk_name = "clk24"
default_clk_period = 1e9/24e6
def __init__(self):
GowinPlatform.__init__(self, "GW1N-LV1QN48C6/I5", _io, _connectors, toolchain="gowin", devicename="GW1N-1")
self.toolchain.options["use_done_as_gpio"] = 1
self.toolchain.options["use_reconfign_as_gpio"] = 1
def create_programmer(self):
return OpenFPGALoader("tangnano")
def do_finalize(self, fragment):
GowinPlatform.do_finalize(self, fragment)
self.add_period_constraint(self.lookup_request("clk24", loose=True), 1e9/24e6)