litex/mibuild/platforms/ml605.py

from mibuild.generic_platform import *
from mibuild.xilinx.common import CRG_DS
from mibuild.xilinx.ise import XilinxISEPlatform

_io = [
	# System clock (Differential 200MHz)
	("clk200", 0,
		Subsignal("p", Pins("J9"), IOStandard("LVDS_25"), Misc("DIFF_TERM=TRUE")),
		Subsignal("n", Pins("H9"), IOStandard("LVDS_25"), Misc("DIFF_TERM=TRUE"))
	),

	# User clock (66MHz)
	("clk66", 0, Pins("U23"), IOStandard("LVCMOS25")),

	# CPU reset switch
	("cpu_reset", 0, Pins("H10"), IOStandard("SSTL15")),

	# LEDs
	("user_led", 0, Pins("AC22"), IOStandard("LVCMOS25"), Misc("SLEW=SLOW")),
	("user_led", 1, Pins("AC24"), IOStandard("LVCMOS25"), Misc("SLEW=SLOW")),
	("user_led", 2, Pins("AE22"), IOStandard("LVCMOS25"), Misc("SLEW=SLOW")),
	("user_led", 3, Pins("AE23"), IOStandard("LVCMOS25"), Misc("SLEW=SLOW")),
	("user_led", 4, Pins("AB23"), IOStandard("LVCMOS25"), Misc("SLEW=SLOW")),
	("user_led", 5, Pins("AG23"), IOStandard("LVCMOS25"), Misc("SLEW=SLOW")),
	("user_led", 6, Pins("AE24"), IOStandard("LVCMOS25"), Misc("SLEW=SLOW")),
	("user_led", 7, Pins("AD24"), IOStandard("LVCMOS25"), Misc("SLEW=SLOW")),

	# USB-to-UART
	("serial", 0,
		Subsignal("tx", Pins("J25"), IOStandard("LVCMOS25")),
		Subsignal("rx", Pins("J24"), IOStandard("LVCMOS25"))
	),

	# 10/100/1000 Tri-Speed Ethernet PHY
	("eth_clocks", 0,
		Subsignal("rx", Pins("AP11")),
		Subsignal("tx", Pins("AD12")),
		IOStandard("LVCMOS25")
	),
	("eth", 0,
		Subsignal("rst_n", Pins("AH13")),
		Subsignal("dv", Pins("AM13")),
		Subsignal("rx_er", Pins("AG12")),
		Subsignal("rx_data", Pins("AN13 AF14 AE14 AN12 AM12 AD11 AC12 AC13")),
		Subsignal("tx_en", Pins("AJ10")),
		Subsignal("tx_er", Pins("AH10")),
		Subsignal("tx_data", Pins("AM11 AL11 AG10 AG11 AL10 AM10 AE11 AF11")),
		Subsignal("col", Pins("AK13")),
		Subsignal("crs", Pins("AL13")),
		IOStandard("LVCMOS25")
	)
]

class Platform(XilinxISEPlatform):
	default_clk_name = "clk200"
	default_clk_period = 5
	def __init__(self):
		XilinxISEPlatform.__init__(self, "xc6vlx240t-ff1156-1", _io,
			lambda p: CRG_DS(p, "clk200", "user_btn"))

	def do_finalize(self, fragment):
		try:
			self.add_period_constraint(self.lookup_request("clk200").p, 5)
		except ConstraintError:
			pass