asm/logicCpu.py

   1
   2 trit_integer = {"i": -1, "0":0, "1":1}
   3
   4 def Decoder(tritstream):
   5     """ Decode a single instruction.
   6         tristream: stream of trits will only process the first 3 trits.
   7         return: dictionary containing the operation
   8     """
   9     inst = {"op":trit_integer[tritstream[0]]}
  10
  11     # cmp and be
  12     if inst["op"] == -1 or inst["op"] == 1:
  13         inst["src1"] = trit_integer[tritstream[1]]
  14         inst["src2"] = trit_integer[tritstream[2]]
  15
  16     # lwi
  17     elif inst["op"] == 0:
  18         print "hi"
  19         inst["src1"] = trit_integer[tritstream[1]]
  20         inst["src2"] = trit_integer[tritstream[2]]
  21         inst["immed"] = 3*inst["src1"] + inst["src2"]
  22
  23     return inst
  24
  25 def Execute(memory, registers, pc):
  26     """ Execute one instruction.
  27         memory: were decoded instructions are stored
  28         registers: contains registers and their values
  29         pc: program counter
  30     """
  31
  32     op = (memory[pc])["op"]
  33
  34     # cmp
  35     if op == -1:
  36         src1 = (memory[pc])["src1"]
  37         src2 = (memory[pc])["src1"]
  38         if (registers[src1] - registers[src2]) == 0:
  39             registers["S"] = 0
  40         else:
  41             registers["S"] = 1
  42     # lwi
  43     elif op == 0:
  44         registers[1] = (memory[pc])["immed"]
  45     # be
  46     elif op == 1:
  47         if registers["S"] == 0:
  48             op = (memory[pc])["src1"]
  49         else:
  50             op = (memory[pc])["src2"]
  51