Initial support for the MIST board (https://github.com/mist-devel/mist-board/wiki)

litex_boards/platforms/mist.py

+# 
+# This file is part of LiteX-Boards.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+
+from litex.build.generic_platform import *
+from litex.build.altera import AlteraPlatform
+from litex.build.altera.programmer import USBBlaster
+
+# IOs ----------------------------------------------------------------------------------------------
+
+_io = [
+    ("clk27", 0, Pins("54")),
+    ("clk27", 0, Pins("54")),
+
+    ("user_led", 0, Pins("7"), 
+        Misc("CURRENT_STRENGTH_NEW 4MA")),
+
+    ("vga", 0,
+        Subsignal("r", Pins("135 137 141 142 143 144")),
+        Subsignal("g", Pins("106 110 111 112 113 114")),
+        Subsignal("b", Pins("115 120 121 125 132 133")),
+        Subsignal("vsync", Pins("136")),
+        Subsignal("hsync", Pins("119")),
+        Misc("CURRENT_STRENGTH_NEW \"MAXIMUM CURRENT\""),
+    ),
+
+    ("audio", 0,
+        Subsignal("l", Pins("65")),
+        Subsignal("r", Pins("80")),
+        Misc("CURRENT_STRENGTH_NEW 4MA"),
+    ),
+
+    ("serial", 0,
+        Subsignal("tx", Pins("46")),
+        Subsignal("rx", Pins("31")),
+    ),
+
+    ("spi", 0,
+        Subsignal("do", Pins("105")),
+        Subsignal("di", Pins("88")),
+        Subsignal("sck", Pins("126")),
+        Subsignal("ss2", Pins("127")),
+        Subsignal("ss3", Pins("91")),
+        Subsignal("ss4", Pins("90")),
+    ),
+
+    ("conf_data0", 0, Pins("13")),
+
+    ("sdram_clock", 0, Pins("43"), 
+        Misc("CURRENT_STRENGTH_NEW \"MAXIMUM CURRENT\""), IOStandard("3.3-V LVTTL")),
+    ("sdram", 0,
+        Subsignal("a", Pins("49 44 42 39 4 6 8 10 11 28 50 30 32")),
+        Subsignal("dq", Pins("83 79 77 76 72 71 69 68 86 87 98 99 100 101 103 104"), 
+            Misc("FAST_INPUT_REGISTER ON"), Misc("FAST_OUTPUT_ENABLE_REGISTER ON")),
+        Subsignal("ba", Pins("58 51")),
+        Subsignal("dm", Pins("67 85")),     # DQML, DQMH
+        Subsignal("ras_n", Pins("60")),
+        Subsignal("cas_n", Pins("64")),
+        Subsignal("we_n", Pins("66")),
+        Subsignal("cs_n", Pins("59")),
+        Subsignal("cke", Pins("33")),
+        Misc("FAST_OUTPUT_REGISTER ON"),
+        Misc("CURRENT_STRENGTH_NEW \"MAXIMUM CURRENT\""),
+    ),
+]
+
+# Platform -----------------------------------------------------------------------------------------
+
+class Platform(AlteraPlatform):
+    default_clk_name   = "clk27"
+    default_clk_period = 1e9/27e6
+
+    def __init__(self):
+        AlteraPlatform.__init__(self, "EP3C25E144C8", _io)
+        self.add_platform_command("set_global_assignment -name FAMILY \"Cyclone III\"")
+        self.add_platform_command("set_global_assignment -name DEVICE_FILTER_PIN_COUNT 144")
+        self.add_platform_command("set_global_assignment -name CYCLONEII_OPTIMIZATION_TECHNIQUE BALANCED")
+        self.add_platform_command("set_global_assignment -name USE_CONFIGURATION_DEVICE OFF")
+        self.add_platform_command("set_global_assignment -name CYCLONEIII_CONFIGURATION_SCHEME \"PASSIVE SERIAL\"")
+        self.add_platform_command("set_global_assignment -name RESERVE_ALL_UNUSED_PINS_WEAK_PULLUP \"AS INPUT TRI-STATED\"")
+        self.add_platform_command("set_global_assignment -name CYCLONEII_RESERVE_NCEO_AFTER_CONFIGURATION \"USE AS REGULAR IO\"")
+        self.add_platform_command("set_global_assignment -name RESERVE_DATA0_AFTER_CONFIGURATION \"USE AS REGULAR IO\"")
+        self.add_platform_command("set_global_assignment -name RESERVE_DATA1_AFTER_CONFIGURATION \"USE AS REGULAR IO\"")
+        self.add_platform_command("set_global_assignment -name RESERVE_FLASH_NCE_AFTER_CONFIGURATION \"USE AS REGULAR IO\"")
+        self.add_platform_command("set_global_assignment -name RESERVE_DCLK_AFTER_CONFIGURATION \"USE AS REGULAR IO\"")
+        self.add_platform_command("set_global_assignment -name STRATIX_DEVICE_IO_STANDARD \"3.3-V LVTTL\"")
+
+    def create_programmer(self):
+        return USBBlaster()
+
+    def do_finalize(self, fragment):
+        AlteraPlatform.do_finalize(self, fragment)
+        self.add_period_constraint(self.lookup_request("clk27", 0, loose=True), 1e9/27e6)
+        self.add_period_constraint(self.lookup_request("clk27", 1, loose=True), 1e9/27e6)
+

litex_boards/targets/mist.py

+#!/usr/bin/env python3
+
+#
+# This file is part of LiteX-Boards.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+
+import os
+import argparse
+
+from migen import *
+from migen.genlib.resetsync import AsyncResetSynchronizer
+
+from litex.build.io import DDROutput
+
+from litex_boards.platforms import mist
+
+from litex.soc.cores.clock import CycloneIVPLL
+from litex.soc.integration.soc import SoCRegion
+from litex.soc.integration.soc_core import *
+from litex.soc.integration.soc_sdram import *
+from litex.soc.integration.builder import *
+from litex.soc.cores.led import LedChaser
+
+from litedram.modules import MT48LC16M16
+from litedram.phy import GENSDRPHY
+
+from litevideo.terminal.core import Terminal
+
+# CRG ----------------------------------------------------------------------------------------------
+
+class _CRG(Module):
+    def __init__(self, platform, sys_clk_freq):
+        self.clock_domains.cd_sys    = ClockDomain()
+        self.clock_domains.cd_sys_ps = ClockDomain(reset_less=True)
+        self.clock_domains.cd_vga    = ClockDomain(reset_less=True)
+
+        # # #
+
+        # Clk / Rst
+        clk27 = platform.request("clk27")
+
+        # PLL
+        self.submodules.pll = pll = CycloneIVPLL(speedgrade="-8")
+        pll.register_clkin(clk27, 27e6)
+        pll.create_clkout(self.cd_sys,    sys_clk_freq)
+        pll.create_clkout(self.cd_sys_ps, sys_clk_freq, phase=90)
+        pll.create_clkout(self.cd_vga, 25e6)
+
+        # SDRAM clock
+        self.specials += DDROutput(1, 0, platform.request("sdram_clock"), ClockSignal("sys_ps"))
+
+# BaseSoC ------------------------------------------------------------------------------------------
+
+class BaseSoC(SoCCore):
+    def __init__(self, sys_clk_freq=int(50e6), with_vga=False, **kwargs):
+        platform = mist.Platform()
+
+        # SoCCore ----------------------------------------------------------------------------------
+        SoCCore.__init__(self, platform, sys_clk_freq,
+            ident          = "LiteX SoC on MIST",
+            ident_version  = True,
+            **kwargs)
+
+        # CRG --------------------------------------------------------------------------------------
+        self.submodules.crg = _CRG(platform, sys_clk_freq)
+
+        # SDR SDRAM --------------------------------------------------------------------------------
+        if not self.integrated_main_ram_size:
+            self.submodules.sdrphy = GENSDRPHY(platform.request("sdram"))
+            self.add_sdram("sdram",
+                phy                     = self.sdrphy,
+                module                  = MT48LC16M16(sys_clk_freq, "1:1"),
+                origin                  = self.mem_map["main_ram"],
+                size                    = kwargs.get("max_sdram_size", 0x2000000),
+                l2_cache_size           = kwargs.get("l2_size", 8192),
+                l2_cache_min_data_width = kwargs.get("min_l2_data_width", 128),
+                l2_cache_reverse        = True
+            )
+
+        # VGA Terminal -----------------------------------------------------------------------------
+        if with_vga:
+            self.submodules.terminal = terminal = Terminal()
+            self.bus.add_slave("terminal", self.terminal.bus, region=SoCRegion(origin=0x30000000, size=0x10000))
+            vga_pads = platform.request("vga")
+            self.comb += [
+                vga_pads.vsync.eq(terminal.vsync),
+                vga_pads.hsync.eq(terminal.hsync),
+                vga_pads.r.eq(terminal.red[2:8]),
+                vga_pads.g.eq(terminal.green[2:8]),
+                vga_pads.b.eq(terminal.blue[2:8])
+            ]
+
+        # Leds -------------------------------------------------------------------------------------
+        self.submodules.leds = LedChaser(
+            pads         = platform.request_all("user_led"),
+            sys_clk_freq = sys_clk_freq)
+        self.add_csr("leds")
+
+# Build --------------------------------------------------------------------------------------------
+
+def main():
+    parser = argparse.ArgumentParser(description="LiteX SoC on MIST")
+    parser.add_argument("--build", action="store_true", help="Build bitstream")
+    parser.add_argument("--load",  action="store_true", help="Load bitstream")
+    builder_args(parser)
+    soc_sdram_args(parser)
+    parser.add_argument("--with-vga", action="store_true", help="Enable VGA support")
+    args = parser.parse_args()
+
+    soc = BaseSoC(with_vga=args.with_vga, **soc_sdram_argdict(args))
+    builder = Builder(soc, **builder_argdict(args))
+    builder.build(run=args.build)
+
+    if args.load:
+        prog = soc.platform.create_programmer()
+        prog.load_bitstream(os.path.join(builder.gateware_dir, soc.build_name + ".sof"))
+
+if __name__ == "__main__":
+    main()
+

test/test_targets.py

@@ -72,6 +72,9 @@ class TestTargets(unittest.TestCase):
         # Xilinx Virtex Ultrascale+
         platforms.append("vcu118")
 
+        # Intel Cyclone3
+        platforms.append("mist")
+
         # Intel Cyclone4
         platforms.append("de0nano")
         platforms.append("de2_115")