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litex-boards/litex_boards/platforms/digilent_nexys4.py

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#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
# Copyright (c) 2021 Michael T. Mayers <michael@tweakoz.com>
# 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("E3"), IOStandard("LVCMOS33")),
("cpu_reset", 0, Pins("C12"), IOStandard("LVCMOS33")),
# Leds
("user_led", 0, Pins("T8"), IOStandard("LVCMOS33")),
("user_led", 1, Pins("V9"), IOStandard("LVCMOS33")),
("user_led", 2, Pins("R8"), IOStandard("LVCMOS33")),
("user_led", 3, Pins("T6"), IOStandard("LVCMOS33")),
("user_led", 4, Pins("T5"), IOStandard("LVCMOS33")),
("user_led", 5, Pins("T4"), IOStandard("LVCMOS33")),
("user_led", 6, Pins("U7"), IOStandard("LVCMOS33")),
("user_led", 7, Pins("U6"), IOStandard("LVCMOS33")),
("user_led", 8, Pins("V4"), IOStandard("LVCMOS33")),
("user_led", 9, Pins("U3"), IOStandard("LVCMOS33")),
("user_led", 10, Pins("V1"), IOStandard("LVCMOS33")),
("user_led", 11, Pins("R1"), IOStandard("LVCMOS33")),
("user_led", 12, Pins("P5"), IOStandard("LVCMOS33")),
("user_led", 13, Pins("U1"), IOStandard("LVCMOS33")),
("user_led", 14, Pins("R2"), IOStandard("LVCMOS33")),
("user_led", 15, Pins("P2"), IOStandard("LVCMOS33")),
# 7SEG DISPLAY
("segled_an", 0, Pins("N6"), IOStandard("LVCMOS33")),
("segled_an", 1, Pins("M6"), IOStandard("LVCMOS33")),
("segled_an", 2, Pins("M3"), IOStandard("LVCMOS33")),
("segled_an", 3, Pins("N5"), IOStandard("LVCMOS33")),
("segled_an", 4, Pins("N2"), IOStandard("LVCMOS33")),
("segled_an", 5, Pins("N4"), IOStandard("LVCMOS33")),
("segled_an", 6, Pins("L1"), IOStandard("LVCMOS33")),
("segled_an", 7, Pins("M1"), IOStandard("LVCMOS33")),
("segled_ca", 0, Pins("L3"), IOStandard("LVCMOS33")),
("segled_cb", 0, Pins("N1"), IOStandard("LVCMOS33")),
("segled_cc", 0, Pins("L5"), IOStandard("LVCMOS33")),
("segled_cd", 0, Pins("L4"), IOStandard("LVCMOS33")),
("segled_ce", 0, Pins("K3"), IOStandard("LVCMOS33")),
("segled_cf", 0, Pins("M2"), IOStandard("LVCMOS33")),
("segled_cg", 0, Pins("L6"), IOStandard("LVCMOS33")),
("segled_dp", 0, Pins("M4"), IOStandard("LVCMOS33")),
("rgb_led", 0,
Subsignal("r", Pins("K6")),
Subsignal("g", Pins("H6")),
Subsignal("b", Pins("L16")),
IOStandard("LVCMOS33"),
),
("rgb_led", 1,
Subsignal("r", Pins("K5")),
Subsignal("g", Pins("F13")),
Subsignal("b", Pins("F6")),
IOStandard("LVCMOS33"),
),
# Switches
("user_sw", 0, Pins("U9"), IOStandard("LVCMOS33")),
("user_sw", 1, Pins("U8"), IOStandard("LVCMOS33")),
("user_sw", 2, Pins("R7"), IOStandard("LVCMOS33")),
("user_sw", 3, Pins("R6"), IOStandard("LVCMOS33")),
("user_sw", 4, Pins("R5"), IOStandard("LVCMOS33")),
("user_sw", 5, Pins("V7"), IOStandard("LVCMOS33")),
("user_sw", 6, Pins("V6"), IOStandard("LVCMOS33")),
("user_sw", 7, Pins("V5"), IOStandard("LVCMOS33")),
("user_sw", 8, Pins("U4"), IOStandard("LVCMOS33")),
("user_sw", 9, Pins("V2"), IOStandard("LVCMOS33")),
("user_sw", 10, Pins("U2"), IOStandard("LVCMOS33")),
("user_sw", 11, Pins("T3"), IOStandard("LVCMOS33")),
("user_sw", 12, Pins("T1"), IOStandard("LVCMOS33")),
("user_sw", 13, Pins("R3"), IOStandard("LVCMOS33")),
("user_sw", 14, Pins("P3"), IOStandard("LVCMOS33")),
("user_sw", 15, Pins("P4"), IOStandard("LVCMOS33")),
# Buttons
("user_btn", 0, Pins("T16"), IOStandard("LVCMOS33")),
("user_btn", 1, Pins("R10"), IOStandard("LVCMOS33")),
("user_btn", 2, Pins("F15"), IOStandard("LVCMOS33")),
("user_btn", 3, Pins("V10"), IOStandard("LVCMOS33")),
("user_btn", 4, Pins("E16"), IOStandard("LVCMOS33")),
# Serial
("serial", 0,
Subsignal("tx", Pins("D4")),
Subsignal("rx", Pins("C4")),
IOStandard("LVCMOS33"),
),
# SDCard
("spisdcard", 0,
Subsignal("rst", Pins("E2")),
Subsignal("clk", Pins("B1")),
Subsignal("mosi", Pins("C1"), Misc("PULLUP True")),
Subsignal("cs_n", Pins("D2"), Misc("PULLUP True")),
Subsignal("miso", Pins("C2"), Misc("PULLUP True")),
Misc("SLEW=FAST"),
IOStandard("LVCMOS33"),
),
("sdcard", 0,
Subsignal("rst", Pins("E2"), Misc("PULLUP True")),
Subsignal("data", Pins("C2 E1 F1 D2"), Misc("PULLUP True")),
Subsignal("cmd", Pins("C1"), Misc("PULLUP True")),
Subsignal("clk", Pins("B1")),
Subsignal("cd", Pins("A1")),
Misc("SLEW=FAST"),
IOStandard("LVCMOS33"),
),
# SRAM
("cellularram", 0,
Subsignal("addr", Pins(
"J18 H17 H15 J17 H16 K15 K13 N15",
"V16 U14 V14 V12 P14 U16 R15 N14",
"N16 M13 V17 U17 T10 M16 U13"),
),
Subsignal("data", Pins(
"R12 T11 U12 R13 U18 R17 T18 R18",
"F18 G18 G17 M18 M17 P18 N17 P17"),
),
Subsignal("oen", Pins("H14")),
Subsignal("wen", Pins("R11")),
Subsignal("clk", Pins("T15")),
Subsignal("adv", Pins("T13")),
Subsignal("wait", Pins("T14")),
Subsignal("cen", Pins("L18")),
Subsignal("ub", Pins("J13")),
Subsignal("lb", Pins("J15")),
Subsignal("cre", Pins("J14")),
Misc("SLEW=FAST"),
IOStandard("LVCMOS33"),
),
# RMII Ethernet
("eth_clocks", 0,
Subsignal("ref_clk", Pins("D5")),
IOStandard("LVCMOS33"),
),
("aud_pwm", 0,
Subsignal("pwm_out", Pins("A11")),
Subsignal("enable", Pins("D12")),
IOStandard("LVCMOS33"),
),
("eth", 0,
Subsignal("rst_n", Pins("B3")),
Subsignal("rx_data", Pins("C11 D10")),
Subsignal("crs_dv", Pins("D9")),
Subsignal("tx_en", Pins("B9")),
Subsignal("tx_data", Pins("A10 A8")),
Subsignal("mdc", Pins("C9")),
Subsignal("mdio", Pins("A9")),
Subsignal("rx_er", Pins("C10")),
Subsignal("int_n", Pins("B8")),
IOStandard("LVCMOS33")
),
# VGA
("vga", 0,
Subsignal("hsync_n", Pins("B11")),
Subsignal("vsync_n", Pins("B12")),
Subsignal("r", Pins("A4 C5 B4 A3")),
Subsignal("g", Pins("A6 B6 A5 C6")),
Subsignal("b", Pins("D7 C7 B7 D8")),
IOStandard("LVCMOS33")
),
]
# Connectors ---------------------------------------------------------------------------------------
_connectors = [
("pmoda", "B13 F14 D17 E17 G13 C17 D18 E18"),
("pmodb", "G14 P15 V11 V15 K16 R16 T9 U11"),
("pmodc", "K2 E7 J3 J4 K1 E6 J2 G6"),
("pmodd", "H4 H1 G1 G3 H2 G4 G2 F3"),
("pmodxdac", "A13 A15 B16 B18 A14 A16 B17 A18"),
]
# PMODS --------------------------------------------------------------------------------------------
def sdcard_pmod_io(pmod):
return [
# SDCard PMOD:
# - https://store.digilentinc.com/pmod-microsd-microsd-card-slot/
("spisdcard", 0,
Subsignal("clk", Pins(f"{pmod}:3")),
Subsignal("mosi", Pins(f"{pmod}:1"), Misc("PULLUP True")),
Subsignal("cs_n", Pins(f"{pmod}:0"), Misc("PULLUP True")),
Subsignal("miso", Pins(f"{pmod}:2"), Misc("PULLUP True")),
Misc("SLEW=FAST"),
IOStandard("LVCMOS33"),
),
("sdcard", 0,
Subsignal("data", Pins(f"{pmod}:2 {pmod}:4 {pmod}:5 {pmod}:0"), Misc("PULLUP True")),
Subsignal("cmd", Pins(f"{pmod}:1"), Misc("PULLUP True")),
Subsignal("clk", Pins(f"{pmod}:3")),
Subsignal("cd", Pins(f"{pmod}:6")),
Misc("SLEW=FAST"),
IOStandard("LVCMOS33"),
),
]
_sdcard_pmod_io = sdcard_pmod_io("pmodd") # SDCARD PMOD on JD.
# Platform -----------------------------------------------------------------------------------------
class Platform(XilinxPlatform):
default_clk_name = "clk100"
default_clk_period = 1e9/100e6
def __init__(self, toolchain="vivado"):
XilinxPlatform.__init__(self, "xc7a100tcsg324-1", _io, _connectors, toolchain=toolchain)
self.add_platform_command("set_property INTERNAL_VREF 0.750 [get_iobanks 34]")
def create_programmer(self):
return OpenOCD("openocd_xc7_ft2232.cfg", "bscan_spi_xc7a100t.bit")
def do_finalize(self, fragment):
XilinxPlatform.do_finalize(self, fragment)
self.add_period_constraint(self.lookup_request("clk100", loose=True), 1e9/100e6)
self.add_period_constraint(self.lookup_request("eth_clocks:ref_clk", loose=True), 1e9/50e6)
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