# This file is Copyright (c) 2019 Florent Kermarrec <florent@enjoy-digital.fr>
# License: BSD

from litex.build.generic_platform import *
from litex.build.xilinx import XilinxPlatform, VivadoProgrammer

# IOs ----------------------------------------------------------------------------------------------

_io = [
    # clock
    ("clk50", 0, Pins("J19"), IOStandard("LVCMOS33")),

    # leds
    ("user_led", 0, Pins("M21"), IOStandard("LVCMOS33")),
    ("user_led", 1, Pins("N20"), IOStandard("LVCMOS33")),
    ("user_led", 2, Pins("L21"), IOStandard("LVCMOS33")),
    ("user_led", 3, Pins("AA21"), IOStandard("LVCMOS33")),
    ("user_led", 4, Pins("R19"), IOStandard("LVCMOS33")),
    ("user_led", 5, Pins("M16"), IOStandard("LVCMOS33")),

    # flash
    ("flash", 0,
        Subsignal("cs_n", Pins("T19")),
        Subsignal("mosi", Pins("P22")),
        Subsignal("miso", Pins("R22")),
        Subsignal("vpp", Pins("P21")),
        Subsignal("hold", Pins("R21")),
        IOStandard("LVCMOS33")
    ),

    # serial
    ("serial", 0,
        Subsignal("tx", Pins("E14")),
        Subsignal("rx", Pins("E13")),
        IOStandard("LVCMOS33"),
    ),

    # dram
    ("ddram", 0,
        Subsignal("a", Pins(
            "U6 V4 W5 V5 AA1 Y2 AB1 AB3",
            "AB2 Y3 W6 Y1 V2 AA3"
            ),
            IOStandard("SSTL15")),
        Subsignal("ba", Pins("U5 W4 V7"), IOStandard("SSTL15")),
        Subsignal("ras_n", Pins("Y9"), IOStandard("SSTL15")),
        Subsignal("cas_n", Pins("Y7"), IOStandard("SSTL15")),
        Subsignal("we_n", Pins("V8"), IOStandard("SSTL15")),
        Subsignal("dm", Pins("M5 L3"), IOStandard("SSTL15")),
        Subsignal("dq", Pins(
            "N2 M6 P1 N5 P2 N4 R1 P6 "
            "K3 M2 K4 M3 J6 L5 J4 K6 "
            ),
            IOStandard("SSTL15"),
            Misc("IN_TERM=UNTUNED_SPLIT_50")),
        Subsignal("dqs_p", Pins("P5 M1"), IOStandard("DIFF_SSTL15")),
        Subsignal("dqs_n", Pins("P4 L1"), IOStandard("DIFF_SSTL15")),
        Subsignal("clk_p", Pins("R3"), IOStandard("DIFF_SSTL15")),
        Subsignal("clk_n", Pins("R2"), IOStandard("DIFF_SSTL15")),
        Subsignal("cke", Pins("Y8"), IOStandard("SSTL15")),
        Subsignal("odt", Pins("W9"), IOStandard("SSTL15")),
        Subsignal("reset_n", Pins("AB5"), IOStandard("LVCMOS15")),
        Subsignal("cs_n", Pins("V9"), IOStandard("SSTL15")),
        Misc("SLEW=FAST"),
    ),

    # ethernet
    ("eth_clocks", 0,
        Subsignal("ref_clk", Pins("D17")),
        IOStandard("LVCMOS33"),
    ),

    ("eth", 0,
        Subsignal("rst_n", Pins("F16")),
        Subsignal("rx_data", Pins("A20 B18")),
        Subsignal("crs_dv", Pins("C20")),
        Subsignal("tx_en", Pins("A19")),
        Subsignal("tx_data", Pins("C18 C19")),
        Subsignal("mdc", Pins("F14")),
        Subsignal("mdio", Pins("F13")),
        Subsignal("rx_er", Pins("B20")),
        Subsignal("int_n", Pins("D21")),
        IOStandard("LVCMOS33")
     ),

     # sdcard
     ("sdcard", 0,
        Subsignal("data", Pins("L15 L16 K14 M13"), Misc("PULLUP True")),
        Subsignal("cmd", Pins("L13"), Misc("PULLUP True")),
        Subsignal("clk", Pins("K18")),
        IOStandard("LVCMOS33"), Misc("SLEW=FAST")
    ),
]

# Platform -----------------------------------------------------------------------------------------

class Platform(XilinxPlatform):
    default_clk_name = "clk50"
    default_clk_period = 20.0

    def __init__(self):
        XilinxPlatform.__init__(self, "xc7a35t-fgg484-2", _io, toolchain="vivado")