src/bsv/actual_pinmux.py

   1 from string import digits
   2 try:
   3     from string import maketrans
   4 except ImportError:
   5     maketrans = str.maketrans
   6
   7
   8 # ============== common bsv templates ============ #
   9 # first argument is the io-cell number being assigned.
  10 # second argument is the mux value.
  11 # Third argument is the signal from the pinmap file
  12 mux_wire = '''
  13         if(wrcell{0}_mux=={1})
  14             {2}<=cell{0}_mux_in;'''
  15 dedicated_wire = '''
  16       rule assign_{1}_on_cell{0};
  17         {1}<=cell{0}_mux_in;
  18       endrule
  19 '''
  20 # ============================================================
  21 digits = maketrans('0123456789', ' ' * 10)  # delete space later
  22
  23
  24 def cn(idx):
  25     return "cell%s_mux" % str(idx)
  26
  27
  28 def transfn(temp):
  29     temp = temp.split('_')
  30     if len(temp) == 2:
  31         temp[0] = temp[0].translate(digits)
  32         temp[0] = temp[0] .replace(' ', '')
  33     return '_'.join(temp)
  34
  35
  36 def init(p, ifaces):
  37     p.pinmux = ' '
  38     global dedicated_wire
  39     for cell in p.muxed_cells:
  40         p.pinmux += "      %s_out=" % cn(cell[0])
  41         for i in range(0, len(cell) - 2):
  42             p.pinmux += "wr%s" % cn(cell[0]) + \
  43                 "==" + str(i) + "?" + cell[i + 1] + "_io:\n\t\t\t"
  44         p.pinmux += cell[i + 2] + "_io"
  45         p.pinmux += ";\n"
  46         # ======================================================== #
  47
  48     # check each cell if "peripheral input/inout" then assign its wire
  49     # Here we check the direction of each signal in the dictionary.
  50     # We choose to keep the dictionary within the code and not user-input
  51     # since the interfaces are always standard and cannot change from
  52     # user-to-user. Plus this also reduces human-error as well :)
  53     p.pinmux += "      rule assign_inputs_from_io_to_wires;"
  54     for cell in p.muxed_cells:
  55         for i in range(0, len(cell) - 1):
  56             cname = cell[i + 1]
  57             temp = transfn(cname)
  58             x = ifaces.getifacetype(temp)
  59             #print (cname, temp, x)
  60             assert x is not None, "ERROR: The signal : " + \
  61                 str(cname) + \
  62                 " of pinmap.txt isn't present \nin the current" + \
  63                 " dictionary. Update dictionary or fix-typo."
  64             if x == "input":
  65                 p.pinmux += \
  66                     mux_wire.format(cell[0], i, "wr" + cname) + "\n"
  67             elif x == "inout":
  68                 p.pinmux += \
  69                     mux_wire.format(cell[0], i, "wr" + cname +
  70                                                 "_in") + "\n"
  71     p.pinmux += "      endrule\n"
  72     # ============================================================ #
  73
  74     # ==================  Logic for dedicated pins ========= #
  75     for cell in p.dedicated_cells:
  76         p.pinmux += "      %s_out=%s_io;\n" % (cn(cell[0]), cell[1])
  77         temp = cell[1].translate(digits)
  78         x = ifaces.getifacetype(temp)
  79         if x == "input":
  80             pinmux = pinmux + \
  81                 dedicated_wire.format(cell[0], "wr" + cell[1]) + "\n"
  82         elif x == "inout":
  83             pinmux = pinmux + \
  84                 dedicated_wire.format(cell[0], "wr" + cell[1] + "_in") + "\n"
  85     # =======================================================#