litex-boards/litex_boards/platforms/aliexpress_xc7k420t.py

99 lines
3.1 KiB
Python

#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2022 Alex Petrov <sysman@sysman.net>
# SPDX-License-Identifier: BSD-2-Clause
from litex.build.generic_platform import *
from litex.build.xilinx import XilinxPlatform, VivadoProgrammer
from litex.build.openocd import OpenOCD
# IOs ----------------------------------------------------------------------------------------------
_io = [
# Clk / Rst
("clk100", 0, Pins("G27"), IOStandard("LVCMOS33")),
("cpu_reset", 0, Pins("W12"), IOStandard("LVCMOS33")),
# Leds
("user_led", 0, Pins("AJ22"), IOStandard("LVCMOS33")), # D3
("user_led", 1, Pins("AJ21"), IOStandard("LVCMOS33")), # D4
("user_led", 2, Pins("AK21"), IOStandard("LVCMOS33")), # D5
("user_led", 3, Pins("AK20"), IOStandard("LVCMOS33")), # D6
("user_led", 4, Pins("AK19"), IOStandard("LVCMOS33")), # D7
("user_led", 5, Pins("AJ19"), IOStandard("LVCMOS33")), # D8
("user_led", 6, Pins("AK18"), IOStandard("LVCMOS33")), # D9
("user_led", 7, Pins("AJ18"), IOStandard("LVCMOS33")), # D10
# Buttons
("user_btn_k3", 0, Pins("AK15"), IOStandard("LVCMOS33")),
("user_btn_k2", 0, Pins("AK16"), IOStandard("LVCMOS33")),
# Serial (CH340)
("serial", 0,
Subsignal("tx", Pins("AK23")),
Subsignal("rx", Pins("AJ23")),
IOStandard("LVCMOS33")
),
# SPIFlash (Micron N25Q256A (32MB))
("spiflash", 0,
Subsignal("cs_n", Pins("V26"), IOStandard("LVCMOS33")),
Subsignal("mosi", Pins("R30"), IOStandard("LVCMOS33")),
Subsignal("miso", Pins("T30"), IOStandard("LVCMOS33")),
Subsignal("wp", Pins("R28"), IOStandard("LVCMOS33")),
Subsignal("hold", Pins("T28"), IOStandard("LVCMOS33"))
),
("spiflash4x", 0,
Subsignal("cs_n", Pins("V26"), IOStandard("LVCMOS33")),
Subsignal("dq", Pins("R30 T30 R28 T28"), IOStandard("LVCMOS33"))
),
]
# Connectors ---------------------------------------------------------------------------------------
_connectors = [
# main board connector, pins as marked
( "main", {
# usb- 1 2 usb+ not used U3 usb3320 don't use
# GND 3 4 GND
# QSPI_CS 5 6 QSPI_D1
# QSPI_D0 7 8 QSPI_CLK
9: "B29",
# 10: "Program_B" key3 reset button
11: "A28",
12: "B27",
13: "A27",
14: "A26",
15: "B25",
16: "A25",
17: "B24",
18: "B23",
19: "A23",
20: "B22",
21: "A22",
22: "A21",
23: "B20",
24: "A20",
# 25,26,27,28: GND
# 29,30,31,32: V12
})
]
# Platform -----------------------------------------------------------------------------------------
class Platform(XilinxPlatform):
default_clk_name = "clk100"
default_clk_period = 1e9/100e6
def __init__(self, toolchain="vivado"):
XilinxPlatform.__init__(self, "xc7k420tl-ffg901", _io, toolchain=toolchain)
def create_programmer(self):
return OpenOCD("openocd_xc7_ft2232.cfg", "bscan_spi_xc7a420t.bit")
def do_finalize(self, fragment):
XilinxPlatform.do_finalize(self, fragment)
self.add_period_constraint(self.lookup_request("clk100", loose=True), 1e9/100e6)