boards/targets: add target for de10lite platform

litex/boards/targets/de10lite.py

+#!/usr/bin/env python3
+
+import argparse
+
+from migen import *
+
+from litex.boards.platforms import de10lite
+
+from litex.soc.integration.soc_sdram import *
+from litex.soc.integration.builder import *
+
+from litedram.modules import IS42S16320
+from litedram.phy import GENSDRPHY
+
+# CRG ----------------------------------------------------------------------------------------------
+class _CRG(Module):
+    def __init__(self, platform):
+        self.clock_domains.cd_sys = ClockDomain()
+        self.clock_domains.cd_sys_ps = ClockDomain()
+        self.clock_domains.cd_por = ClockDomain(reset_less=True)
+
+        # # #
+
+        self.cd_sys.clk.attr.add("keep")
+        self.cd_sys_ps.clk.attr.add("keep")
+        self.cd_por.clk.attr.add("keep")
+
+        # power on rst
+        rst_n = Signal()
+        self.sync.por += rst_n.eq(1)
+        self.comb += [
+            self.cd_por.clk.eq(self.cd_sys.clk),
+            self.cd_sys.rst.eq(~rst_n),
+            self.cd_sys_ps.rst.eq(~rst_n)
+        ]
+
+        # sys clk / sdram clk
+        clk50 = platform.request("clk50")
+        self.comb += self.cd_sys.clk.eq(clk50)
+        self.specials += \
+            Instance("ALTPLL",
+                p_BANDWIDTH_TYPE="AUTO",
+                p_CLK0_DIVIDE_BY=1,
+                p_CLK0_DUTY_CYCLE=50,
+                p_CLK0_MULTIPLY_BY=1,
+                p_CLK0_PHASE_SHIFT="-10000",
+                p_COMPENSATE_CLOCK="CLK0",
+                p_INCLK0_INPUT_FREQUENCY=20000,
+                p_INTENDED_DEVICE_FAMILY="MAX 10",
+                p_LPM_TYPE = "altpll",
+                p_OPERATION_MODE = "NORMAL",
+                i_INCLK=clk50,
+                o_CLK=self.cd_sys_ps.clk,
+                i_ARESET=~rst_n,
+                i_CLKENA=0x3f,
+                i_EXTCLKENA=0xf,
+                i_FBIN=1,
+                i_PFDENA=1,
+                i_PLLENA=1,
+            )
+        self.comb += platform.request("sdram_clock").eq(self.cd_sys_ps.clk)
+
+# BaseSoC ------------------------------------------------------------------------------------------
+
+class BaseSoC(SoCSDRAM):
+    def __init__(self, sys_clk_freq=int(50e6), **kwargs):
+        assert sys_clk_freq == int(50e6)
+        platform = de10lite.Platform()
+        SoCSDRAM.__init__(self, platform, clk_freq=sys_clk_freq,
+                          integrated_rom_size=0x8000,
+                          **kwargs)
+
+        self.submodules.crg = _CRG(platform)
+
+        if not self.integrated_main_ram_size:
+            self.submodules.sdrphy = GENSDRPHY(platform.request("sdram"))
+            sdram_module = IS42S16320(self.clk_freq, "1:1")
+            self.register_sdram(self.sdrphy,
+                                sdram_module.geom_settings,
+                                sdram_module.timing_settings)
+
+# Build --------------------------------------------------------------------------------------------
+
+def main():
+    parser = argparse.ArgumentParser(description="LiteX SoC on DE10 Lite")
+    builder_args(parser)
+    soc_sdram_args(parser)
+    args = parser.parse_args()
+
+    soc = BaseSoC(**soc_sdram_argdict(args))
+    builder = Builder(soc, **builder_argdict(args))
+    builder.build()
+
+
+if __name__ == "__main__":
+    main()