examples/memory_sim.py

   1 from migen.fhdl.structure import *
   2 from migen.sim.generic import Simulator
   3 from migen.sim.icarus import Runner
   4
   5 class Mem:
   6         def __init__(self):
   7                 self.a = Signal(BV(12))
   8                 self.d = Signal(BV(16))
   9                 p = MemoryPort(self.a, self.d)
  10                 # Initialize the beginning of the memory with integers
  11                 # from 0 to 19.
  12                 self.mem = Memory(16, 2**12, p, init=list(range(20)))
  13
  14         def do_simulation(self, s):
  15                 # Read the memory. Use the cycle counter as address.
  16                 value = s.rd(self.mem, s.cycle_counter)
  17                 # Print the result. Output is:
  18                 # 0
  19                 # 1
  20                 # 2
  21                 # ...
  22                 print(value)
  23                 # Demonstrate how to interrupt the simulator.
  24                 if value == 10:
  25                         s.interrupt = True
  26
  27         def get_fragment(self):
  28                 return Fragment(memories=[self.mem], sim=[self.do_simulation])
  29
  30 def main():
  31         dut = Mem()
  32         sim = Simulator(dut.get_fragment(), Runner())
  33         # No need for a cycle limit here, we use sim.interrupt instead.
  34         sim.run()
  35
  36 main()