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       rule assign_{2}_on_cell{0}(wrcell{0}_mux=={1});
  14         {2}<=cell{0}_mux_in;
  15       endrule
  16 '''
  17 dedicated_wire = '''
  18       rule assign_{1}_on_cell{0};
  19         {1}<=cell{0}_mux_in;
  20       endrule
  21 '''
  22 # ============================================================
  23 digits = maketrans('0123456789', ' ' * 10)  # delete space later
  24
  25
  26 def cn(idx):
  27     return "cell%s_mux" % str(idx)
  28
  29
  30 def transfn(temp):
  31     temp = temp.split('_')
  32     if len(temp) == 2:
  33         temp[0] = temp[0].translate(digits)
  34         temp[0] = temp[0] .replace(' ', '')
  35     return '_'.join(temp)
  36
  37
  38 def init(p, ifaces):
  39     """ generates the actual output pinmux for each io-cell.  blank lines
  40         need to output "0" to the iopad, if there is no entry in
  41         that column.
  42     """
  43     p.pinmux = ' '
  44     global dedicated_wire
  45     for cell in p.muxed_cells:
  46         p.pinmux += "      // output muxer for cell idx %d\n" % cell[0]
  47         p.pinmux += "      %s_out=" % cn(cell[0])
  48         for i in range(0, len(cell) - 2):
  49             p.pinmux += "wr%s" % cn(cell[0]) + \
  50                 "==" + str(i) + "?" + cell[i + 1] + "_io:\n\t\t\t"
  51         p.pinmux += cell[i + 2] + "_io"
  52         p.pinmux += ";\n"
  53         # ======================================================== #
  54
  55         # check each cell if "peripheral input/inout" then assign its wire
  56         # Here we check the direction of each signal in the dictionary.
  57         # We choose to keep the dictionary within the code and not user-input
  58         # since the interfaces are always standard and cannot change from
  59         # user-to-user. Plus this also reduces human-error as well :)
  60         for i in range(0, len(cell) - 1):
  61             cname = cell[i + 1]
  62             temp = transfn(cname)
  63             x = ifaces.getifacetype(temp)
  64             #print (cname, temp, x)
  65             assert x is not None, "ERROR: The signal : " + \
  66                 str(cname) + \
  67                 " of pinmap.txt isn't present \nin the current" + \
  68                 " dictionary. Update dictionary or fix-typo."
  69             if x == "input":
  70                 p.pinmux += \
  71                     mux_wire.format(cell[0], i, "wr" + cname) + "\n"
  72             elif x == "inout":
  73                 p.pinmux += \
  74                     mux_wire.format(cell[0], i, "wr" + cname +
  75                                                 "_in") + "\n"
  76     # ============================================================ #
  77
  78     # ==================  Logic for dedicated pins ========= #
  79     for cell in p.dedicated_cells:
  80         p.pinmux += "      %s_out=%s_io;\n" % (cn(cell[0]), cell[1])
  81         temp = cell[1].translate(digits)
  82         x = ifaces.getifacetype(temp)
  83         if x == "input":
  84             pinmux = pinmux + \
  85                 dedicated_wire.format(cell[0], "wr" + cell[1]) + "\n"
  86         elif x == "inout":
  87             pinmux = pinmux + \
  88                 dedicated_wire.format(cell[0], "wr" + cell[1] + "_in") + "\n"
  89     # =======================================================#