constraints.py

   1 def get(ns, crg0, norflash0, uart0, ddrphy0):
   2         constraints = []
   3         def add(signal, pin, vec=-1, iostandard="LVCMOS33", extra=""):
   4                 constraints.append((ns.get_name(signal), vec, pin, iostandard, extra))
   5         def add_vec(signal, pins, iostandard="LVCMOS33", extra=""):
   6                 assert(signal.bv.width == len(pins))
   7                 i = 0
   8                 for p in pins:
   9                         add(signal, p, i, iostandard, extra)
  10                         i += 1
  11
  12         add(crg0.clkin, "AB11", extra="TNM_NET = \"GRPclk50\"")
  13         add(crg0.ac97_rst_n, "D6")
  14         add(crg0.videoin_rst_n, "W17")
  15         add(crg0.flash_rst_n, "P22", extra="SLEW = FAST | DRIVE = 8")
  16         add(crg0.trigger_reset, "AA4")
  17
  18         add_vec(norflash0.adr, ["L22", "L20", "K22", "K21", "J19", "H20", "F22",
  19                 "F21", "K17", "J17", "E22", "E20", "H18", "H19", "F20",
  20                 "G19", "C22", "C20", "D22", "D21", "F19", "F18", "D20", "D19"],
  21                 extra="SLEW = FAST | DRIVE = 8")
  22         add_vec(norflash0.d, ["AA20", "U14", "U13", "AA6", "AB6", "W4", "Y4", "Y7",
  23                 "AA2", "AB2", "V15", "AA18", "AB18", "Y13", "AA12", "AB12"],
  24                 extra="SLEW = FAST | DRIVE = 8 | PULLDOWN")
  25         add(norflash0.oe_n, "M22", extra="SLEW = FAST | DRIVE = 8")
  26         add(norflash0.we_n, "N20", extra="SLEW = FAST | DRIVE = 8")
  27         add(norflash0.ce_n, "M21", extra="SLEW = FAST | DRIVE = 8")
  28
  29         add(uart0.tx, "L17", extra="SLEW = SLOW")
  30         add(uart0.rx, "K18", extra="PULLUP")
  31
  32         ddrsettings = "IOSTANDARD = SSTL2_I"
  33         add(ddrphy0.sd_clk_out_p, "M3", extra=ddrsettings)
  34         add(ddrphy0.sd_clk_out_n, "L4", extra=ddrsettings)
  35         add_vec(ddrphy0.sd_a, ["B1", "B2", "H8", "J7", "E4", "D5", "K7", "F5",
  36                 "G6", "C1", "C3", "D1", "D2"], extra=ddrsettings)
  37         add_vec(ddrphy0.sd_ba, ["A2", "E6"], extra=ddrsettings)
  38         add(ddrphy0.sd_cs_n, "F7", extra=ddrsettings)
  39         add(ddrphy0.sd_cke, "G7", extra=ddrsettings)
  40         add(ddrphy0.sd_ras_n, "E5", extra=ddrsettings)
  41         add(ddrphy0.sd_cas_n, "C4", extra=ddrsettings)
  42         add(ddrphy0.sd_we_n, "D3", extra=ddrsettings)
  43         add_vec(ddrphy0.sd_dq, ["Y2", "W3", "W1", "P8", "P7", "P6", "P5", "T4", "T3",
  44                 "U4", "V3", "N6", "N7", "M7", "M8", "R4", "P4", "M6", "L6", "P3", "N4",
  45                 "M5", "V2", "V1", "U3", "U1", "T2", "T1", "R3", "R1", "P2", "P1"],
  46                 extra=ddrsettings)
  47         add_vec(ddrphy0.sd_dm, ["E1", "E3", "F3", "G4"], extra=ddrsettings)
  48         add_vec(ddrphy0.sd_dqs, ["F1", "F2", "H5", "H6"], extra=ddrsettings)
  49
  50         r = ""
  51         for c in constraints:
  52                 r += "NET \"" + c[0]
  53                 if c[1] >= 0:
  54                         r += "(" + str(c[1]) + ")"
  55                 r += "\" LOC = " + c[2]
  56                 r += " | IOSTANDARD = " + c[3]
  57                 if c[4]:
  58                         r += " | " + c[4]
  59                 r += ";\n"
  60
  61         r += """
  62 TIMESPEC "TSclk50" = PERIOD "GRPclk50" 20 ns HIGH 50%;
  63 INST "m1crg/wr_bufpll" LOC = "BUFPLL_X0Y2";
  64 INST "m1crg/rd_bufpll" LOC = "BUFPLL_X0Y3";
  65 """
  66
  67         return r