boards/platforms: Add Arty S7 Board.

diff --git a/litex/boards/platforms/arty_s7.py b/litex/boards/platforms/arty_s7.py
new file mode 100644 (file)
index 0000000..fdec208
--- /dev/null
+++ b/litex/boards/platforms/arty_s7.py
@@ -0,0 +1,116 @@
+# This file is Copyright (c) 2018 William D. Jones <thor0505@comcast.net>
+# License: BSD
+
+from litex.build.generic_platform import *
+from litex.build.xilinx import XilinxPlatform, XC3SProg, VivadoProgrammer
+
+_io = [
+    ("user_led", 0, Pins("E18"), IOStandard("LVCMOS33")),
+    ("user_led", 1, Pins("F13"), IOStandard("LVCMOS33")),
+    ("user_led", 2, Pins("E13"), IOStandard("LVCMOS33")),
+    ("user_led", 3, Pins("H15"), IOStandard("LVCMOS33")),
+
+    ("rgb_leds", 0,
+        Subsignal("r", Pins("J15 E15")),
+        Subsignal("g", Pins("G17 F18")),
+        Subsignal("b", Pins("F15 E14")),
+        IOStandard("LVCMOS33")
+    ),
+
+    ("user_sw", 0, Pins("H14"), IOStandard("LVCMOS33")),
+    ("user_sw", 1, Pins("H18"), IOStandard("LVCMOS33")),
+    ("user_sw", 2, Pins("G18"), IOStandard("LVCMOS33")),
+    ("user_sw", 3, Pins("M5"), IOStandard("LVCMOS33")),
+
+    ("user_btn", 0, Pins("G15"), IOStandard("LVCMOS33")),
+    ("user_btn", 1, Pins("K16"), IOStandard("LVCMOS33")),
+    ("user_btn", 2, Pins("J16"), IOStandard("LVCMOS33")),
+    ("user_btn", 3, Pins("H13"), IOStandard("LVCMOS33")),
+
+    ("clk100", 0, Pins("R2"), IOStandard("LVCMOS33")),
+
+    ("cpu_reset", 0, Pins("C18"), IOStandard("LVCMOS33")),
+
+    ("serial", 0,
+        Subsignal("tx", Pins("R12")),
+        Subsignal("rx", Pins("V12")),
+        IOStandard("LVCMOS33")),
+
+    ("spi", 0,
+        Subsignal("clk", Pins("G16")),
+        Subsignal("cs_n", Pins("H16")),
+        Subsignal("mosi", Pins("H17")),
+        Subsignal("miso", Pins("K14")),
+        IOStandard("LVCMOS33")
+    ),
+
+    ("spiflash_4x", 0,  # clock needs to be accessed through STARTUPE2
+        Subsignal("cs_n", Pins("M13")),
+        Subsignal("dq", Pins("K17", "K18", "L14", "M15")),
+        IOStandard("LVCMOS33")
+    ),
+    ("spiflash_1x", 0,  # clock needs to be accessed through STARTUPE2
+        Subsignal("cs_n", Pins("M13")),
+        Subsignal("mosi", Pins("K17")),
+        Subsignal("miso", Pins("K18")),
+        Subsignal("wp", Pins("L14")),
+        Subsignal("hold", Pins("M15")),
+        IOStandard("LVCMOS33")
+    ),
+
+    ("ddram", 0,
+        Subsignal("a", Pins(
+            "U2 R4 V2 V4 T3 R7 V6 T6",
+            "U7 V7 P6 T5 R6 U6"),
+            IOStandard("SSTL135")),
+        Subsignal("ba", Pins("V5 T1 U3"), IOStandard("SSTL135")),
+        Subsignal("ras_n", Pins("U1"), IOStandard("SSTL135")),
+        Subsignal("cas_n", Pins("V3"), IOStandard("SSTL135")),
+        Subsignal("we_n", Pins("P7"), IOStandard("SSTL135")),
+        Subsignal("cs_n", Pins("R3"), IOStandard("SSTL135")),
+        Subsignal("dm", Pins("K4 M3"), IOStandard("SSTL135")),
+        Subsignal("dq", Pins(
+            "K2 K3 L4 M6 K6 M4 L5 L6",
+            "N4 R1 N1 N5 M2 P1 M1 P2"),
+            IOStandard("SSTL135"),
+            Misc("IN_TERM=UNTUNED_SPLIT_40")),
+        Subsignal("dqs_p", Pins("K1 N3"), IOStandard("DIFF_SSTL135")),
+        Subsignal("dqs_n", Pins("L1 N2"), IOStandard("DIFF_SSTL135")),
+        Subsignal("clk_p", Pins("R5"), IOStandard("DIFF_SSTL135")),
+        Subsignal("clk_n", Pins("T4"), IOStandard("DIFF_SSTL135")),
+        Subsignal("cke", Pins("T2"), IOStandard("SSTL135")),
+        Subsignal("odt", Pins("P5"), IOStandard("SSTL135")),
+        Subsignal("reset_n", Pins("J6"), IOStandard("SSTL135")),
+        Misc("SLEW=FAST"),
+    ),
+
+    ("pmoda", 0, Pins("L17 L18 M14 N14 M16 M17 M18 N18"), IOStandard("LVCMOS33")),
+    ("pmodb", 0, Pins("P17 P18 R18 T18 P14 P15 N15 P16"), IOStandard("LVCMOS33")),
+    ("pmodc", 0, Pins("U15 V16 U17 U18 U16 P13 R13 V14"), IOStandard("LVCMOS33")),
+    ("pmodd", 0, Pins("V15 U12 V13 T12 T13 R11 T11 U11"), IOStandard("LVCMOS33")),
+]
+
+
+class Platform(XilinxPlatform):
+    default_clk_name = "clk100"
+    default_clk_period = 10.0
+
+    def __init__(self, toolchain="vivado", programmer="vivado"):
+        XilinxPlatform.__init__(self, "xc7s50csga324-1", _io,
+                                toolchain=toolchain)
+        self.toolchain.bitstream_commands = \
+            ["set_property BITSTREAM.CONFIG.SPI_BUSWIDTH 4 [current_design]"]
+        self.toolchain.additional_commands = \
+            ["write_cfgmem -force -format bin -interface spix4 -size 16 "
+             "-loadbit \"up 0x0 {build_name}.bit\" -file {build_name}.bin"]
+        self.programmer = programmer
+        self.add_platform_command("set_property INTERNAL_VREF 0.675 [get_iobanks 34]")
+
+    def create_programmer(self):
+        if self.programmer == "xc3sprog":
+            return XC3SProg("nexys4")
+        elif self.programmer == "vivado":
+            return VivadoProgrammer(flash_part="n25q128-3.3v-spi-x1_x2_x4")
+        else:
+            raise ValueError("{} programmer is not supported"
+                             .format(self.programmer))