smh_ac440b_board.py

   1 from litex.build.generic_platform import *
   2 from litex.build.altera import AlteraPlatform
   3 from litex.build.altera.programmer import USBBlaster
   4
   5 # I/O --------------------------------------------------------------------------
   6
   7 _io = [
   8
   9     # Persistent I/O - fixed on the AC440B itself ------------------------------
  10
  11     # Clk
  12     ("clk50",   0, Pins("T2"),  IOStandard("3.3-V LVTTL")),
  13
  14     # D1-D4
  15     ("u_led_n", 0, Pins("V22"), IOStandard("3.3-V LVTTL")),
  16     ("u_led_n", 1, Pins("V21"), IOStandard("3.3-V LVTTL")),
  17     ("u_led_n", 2, Pins("U22"), IOStandard("3.3-V LVTTL")),
  18     ("u_led_n", 3, Pins("U21"), IOStandard("3.3-V LVTTL")),
  19
  20     # RST, K1-K2
  21     ("rst_n",   0, Pins("D2"),  IOStandard("3.3-V LVTTL")),
  22     ("u_key_n", 0, Pins("W1"),  IOStandard("3.3-V LVTTL")),
  23     ("u_key_n", 1, Pins("V1"),  IOStandard("3.3-V LVTTL")),
  24
  25     # Persistent I/O end -------------------------------------------------------
  26
  27     ("serial", 0,
  28         Subsignal("tx", Pins("Y22"), IOStandard("3.3-V LVTTL")),
  29         Subsignal("rx", Pins("W22"), IOStandard("3.3-V LVTTL"))
  30     ),
  31
  32  ]
  33
  34 _connectors = [
  35
  36 ]
  37
  38 # Platform ---------------------------------------------------------------------
  39
  40 class Platform(AlteraPlatform):
  41     default_clk_name   = "clk50"
  42     default_clk_period = 1e9/50e6
  43
  44     def __init__(self, toolchain="quartus"):
  45         AlteraPlatform.__init__(self, "EP4CE40F23C8", _io, _connectors, toolchain=toolchain)
  46         self.add_platform_command("set_global_assignment -name CYCLONEII_RESERVE_NCEO_AFTER_CONFIGURATION \"USE AS REGULAR IO\"")
  47
  48     def create_programmer(self):
  49         return USBBlaster()
  50
  51     def do_finalize(self, fragment):
  52         AlteraPlatform.do_finalize(self, fragment)
  53         self.add_period_constraint(self.lookup_request("clk50", loose=True), 1e9/50e6)