#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2019 Antony Pavlov <antonynpavlov@gmail.com>
# 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 = [
    # Clk
    ("clk50", 0, Pins("AF14"), IOStandard("3.3-V LVTTL")),

    # Serial
    ("serial", 0,
        Subsignal("tx", Pins("AC18"), IOStandard("3.3-V LVTTL")), # JP1 GPIO[0]
        Subsignal("rx", Pins("Y17"),  IOStandard("3.3-V LVTTL"))  # JP1 GPIO[1]
    ),

    # SDR SDRAM
    ("sdram_clock", 0, Pins("AH12"), IOStandard("3.3-V LVTTL")),
    ("sdram", 0,
        Subsignal("a",     Pins(
            "AK14 AH14 AG15 AE14 AB15 AC14 AD14 AF15",
            "AH15 AG13 AG12 AH13 AJ14")),
        Subsignal("ba",    Pins("AF13 AJ12")),
        Subsignal("cs_n",  Pins("AG11")),
        Subsignal("cke",   Pins("AK13")),
        Subsignal("ras_n", Pins("AE13")),
        Subsignal("cas_n", Pins("AF11")),
        Subsignal("we_n",  Pins("AA13")),
        Subsignal("dq", Pins(
            "AK6   AJ7 AK7 AK8 AK9 AG10 AK11 AJ11",
            "AH10 AJ10 AJ9 AH9 AH8  AH7  AJ6 AJ5")),
        Subsignal("dm", Pins("AB13 AK12")),
        IOStandard("3.3-V LVTTL")
    ),
]

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

class Platform(AlteraPlatform):
    default_clk_name   = "clk50"
    default_clk_period = 1e9/50e6

    def __init__(self):
        AlteraPlatform.__init__(self, "5CSEMA5F31C6", _io)

    def create_programmer(self):
        return USBBlaster()

    def do_finalize(self, fragment):
        AlteraPlatform.do_finalize(self, fragment)
        self.add_period_constraint(self.lookup_request("clk50", loose=True), 1e9/50e6)