litex-boards/litex_boards/platforms/tinyfpga_bx.py

80 lines
2.5 KiB
Python

#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2018 William D. Jones <thor0505@comcast.net>
# Copyright (c) 2019 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause
from litex.build.generic_platform import *
from litex.build.lattice import LatticePlatform
from litex.build.lattice.programmer import TinyProgProgrammer
# IOs ----------------------------------------------------------------------------------------------
_io = [
# Clk / Rst
("clk16", 0, Pins("B2"), IOStandard("LVCMOS33")),
# Leds
("user_led", 0, Pins("B3"), IOStandard("LVCMOS33")),
# USB
("usb", 0,
Subsignal("d_p", Pins("B4")),
Subsignal("d_n", Pins("A4")),
Subsignal("pullup", Pins("A3")),
IOStandard("LVCMOS33")
),
# SPIFlash
("spiflash", 0,
Subsignal("cs_n", Pins("F7"), IOStandard("LVCMOS33")),
Subsignal("clk", Pins("G7"), IOStandard("LVCMOS33")),
Subsignal("mosi", Pins("G6"), IOStandard("LVCMOS33")),
Subsignal("miso", Pins("H7"), IOStandard("LVCMOS33")),
Subsignal("wp", Pins("H4"), IOStandard("LVCMOS33")),
Subsignal("hold", Pins("J8"), IOStandard("LVCMOS33"))
),
("spiflash4x", 0,
Subsignal("cs_n", Pins("F7"), IOStandard("LVCMOS33")),
Subsignal("clk", Pins("G7"), IOStandard("LVCMOS33")),
Subsignal("dq", Pins("G6 H7 H4 J8"), IOStandard("LVCMOS33"))
),
]
# Connectors ---------------------------------------------------------------------------------------
_connectors = [
# A2-H2, Pins 1-13
# H9-A6, Pins 14-24
# G1-J2, Pins 25-31
("GPIO", "A2 A1 B1 C2 C1 D2 D1 E2 E1 G2 H1 J1 H2 H9 D9 D8 C9 A9 B8 A8 B7 A7 B6 A6"),
("EXTRA", "G1 J3 J4 G9 J9 E8 J2")
]
# Default peripherals
serial = [
("serial", 0,
Subsignal("tx", Pins("GPIO:0")),
Subsignal("rx", Pins("GPIO:1")),
IOStandard("LVCMOS33")
)
]
# Platform -----------------------------------------------------------------------------------------
class Platform(LatticePlatform):
default_clk_name = "clk16"
default_clk_period = 1e9/16e6
def __init__(self):
LatticePlatform.__init__(self, "ice40-lp8k-cm81", _io, _connectors, toolchain="icestorm")
self.add_extension(serial)
def create_programmer(self):
return TinyProgProgrammer()
def do_finalize(self, fragment):
LatticePlatform.do_finalize(self, fragment)
self.add_period_constraint(self.lookup_request("clk16", loose=True), 1e9/16e6)