litex/mibuild/platforms/usrp_b100.py

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

_io = [
		("clk64", 0,
			Subsignal("p", Pins("R7")),
			Subsignal("n", Pins("T7")),
			IOStandard("LVDS_33"),
			Misc("DIFF_TERM=TRUE"),
		),

		("pps", 0, Pins("M14"), Misc("TIG")),
		("reset_n", 0, Pins("D5"), Misc("TIG")),
		("codec_reset", 0, Pins("B14")),
		# recycles fpga_cfg_cclk for reset from fw
		("ext_reset", 0, Pins("R14")),

		("i2c", 0,
			Subsignal("sda", Pins("T13")),
			Subsignal("scl", Pins("R13")),
		),

		("cgen", 0,
			Subsignal("st_ld", Pins("M13")),
			Subsignal("st_refmon", Pins("J14")),
			Subsignal("st_status", Pins("P6")),
			Subsignal("ref_sel", Pins("T2")),
			Subsignal("sync_b", Pins("H15")),
		),

		("fx2_ifclk", 0, Pins("T8")),
		("fx2_gpif", 0,
			Subsignal("d", Pins("P8 P9 N9 T9 R9 P11 P13 N12 "
								"T3 R3 P5 N6 T6 T5 N8 P7")),
			Subsignal("ctl", Pins("M7 M9 M11 P12")),
			Subsignal("slwr", Pins("T4")), # rdy0
			Subsignal("slrd", Pins("R5")), # rdy1
			#Subsignal("rdy2", Pins("T10")),
			#Subsignal("rdy3", Pins("N11")),
			#Subsignal("cs", Pins("P12")),
			Subsignal("sloe", Pins("R11")),
			Subsignal("pktend", Pins("P10")),
			Subsignal("adr", Pins("T11 H16")),
		),

		("user_led", 0, Pins("P4"), Misc("TIG")),
		("user_led", 1, Pins("N4"), Misc("TIG")),
		("user_led", 2, Pins("R2"), Misc("TIG")),

		("debug_clk", 0, Pins("K15 K14")),
		("debug", 0, Pins(
			"K16 J16 C16 C15 E13 D14 D16 D15 "
			"E14 F13 G13 F14 E16 F15 H13 G14 "
			"G16 F16 J12 J13 L14 L16 M15 M16 "
			"L13 K13 P16 N16 R15 P15 N13 N14")),

		("adc", 0,
			Subsignal("sync", Pins("D10")),
			Subsignal("d", Pins("A4 B3 A3 D9 C10 A9 C9 D8 "
								"C8 B8 A8 B15")),
		),
		("dac", 0,
			Subsignal("blank", Pins("K1")),
			Subsignal("sync", Pins("J2")),
			Subsignal("d", Pins("J1 H3 J3 G2 H1 N3 M4 R1 "
								"P2 P1 M1 N1 M3 L4")),
		),
		("codec_spi", 0,
			Subsignal("sclk", Pins("K3")),
			Subsignal("sen", Pins("D13")),
			Subsignal("mosi", Pins("C13")),
			Subsignal("miso", Pins("G4")),
		),

		("aux_spi", 0,
			Subsignal("sen", Pins("C12")),
			Subsignal("sclk", Pins("D12")),
			Subsignal("miso", Pins("J5")),
		),
		("rx_io", 0, Pins("D7 C6 A6 B6 E9 A7 C7 B10 "
						  "A10 C11 A11 D11 B12 A12 A14 A13")),
		("tx_io", 0, Pins("K4 L3 L2 F1 F3 G3 E3 E2 "
						  "E4 F4 D1 E1 D4 D3 C2 C1")),
		("rx_spi", 0,
			Subsignal("miso", Pins("E6")),
			Subsignal("sen", Pins("B4")),
			Subsignal("mosi", Pins("A5")),
			Subsignal("sclk", Pins("C5")),
		),
		("tx_spi", 0,
			Subsignal("miso", Pins("J4")),
			Subsignal("sen", Pins("N2")),
			Subsignal("mosi", Pins("L1")),
			Subsignal("sclk", Pins("G1")),
		),

		# these are just for information. do not request.
		("mystery_bus", 0, Pins("C4 E7")),
		("fpga_cfg",
			Subsignal("din", Pins("T14")),
			Subsignal("cclk", Pins("R14")),
			Subsignal("init_b", Pins("T12")),
			Subsignal("prog_b", Pins("A2")),
			Subsignal("done", Pins("T15")),
		),
		("jtag",
			Subsignal("tms", Pins("B2")),
			Subsignal("tdo", Pins("B16")),
			Subsignal("tdi", Pins("B1")),
			Subsignal("tck", Pins("A15")),
		),
]


class Platform(XilinxISEPlatform):
	default_clk_name = "clk64"
	default_clk_period = 15.625
	bitgen_opt = "-g LCK_cycle:6 -g Binary:Yes -w -g UnusedPin:PullUp"
	def __init__(self):
		XilinxISEPlatform.__init__(self, "xc3s1400a-ft256-4", _io,
			lambda p: CRG_DS(p, "clk64", "reset_n", rst_invert=True))

	def do_finalize(self, fragment):
		try:
			self.add_platform_command("""
NET "{clk64}" TNM_NET = "GRPclk64";
TIMESPEC "TSclk64" = PERIOD "GRPclk64" 15.625 ns HIGH 50%;
""", clk64=self.lookup_request("clk64"))
		except ConstraintError:
			pass

		self.add_platform_command("""
TIMESPEC TS_Pad2Pad = FROM PADS TO PADS 7 ns;
""")

		try:
			ifclk = self.lookup_request("fx2_ifclk")
			gpif = self.lookup_request("fx2_gpif")
			for i, d in [(gpif.d, "in"), (gpif.d, "out"),
					(gpif.ctl, "in"), (gpif.adr, "out"),
					(gpif.slwr, "out"), (gpif.sloe, "out"),
					(gpif.slrd, "out"), (gpif.pktend, "out")]:
				if flen(i) > 1:
					q = "(*)"
				else:
					q = ""
				self.add_platform_command("""
INST "{i}%s" TNM = gpif_net_%s;
""" % (q, d), i=i)
			self.add_platform_command("""
NET "{ifclk}" TNM_NET = "GRPifclk";
TIMESPEC "TSifclk" = PERIOD "GRPifclk" 20833 ps HIGH 50%;
TIMEGRP "gpif_net_in" OFFSET = IN 5 ns VALID 10 ns BEFORE "{ifclk}" RISING;
TIMEGRP "gpif_net_out" OFFSET = OUT 7 ns AFTER "{ifclk}" RISING;
""", ifclk=ifclk)
		except ConstraintError:
 			pass