milkymist/lm32/__init__.py

   1 from migen.fhdl.structure import *
   2 from migen.bus import wishbone
   3
   4 class LM32:
   5         def __init__(self):
   6                 self.ibus = i = wishbone.Interface()
   7                 self.dbus = d = wishbone.Interface()
   8                 self.interrupt = Signal(BV(32))
   9                 self.ext_break = Signal()
  10                 self._inst = Instance("lm32_top",
  11                         Instance.ClockPort("clk_i"),
  12                         Instance.ResetPort("rst_i"),
  13
  14                         Instance.Input("interrupt", self.interrupt),
  15                         #Instance.Input("ext_break", self.ext_break),
  16
  17                         Instance.Output("I_ADR_O", BV(32)),
  18                         Instance.Output("I_DAT_O", i.dat_w),
  19                         Instance.Output("I_SEL_O", i.sel),
  20                         Instance.Output("I_CYC_O", i.cyc),
  21                         Instance.Output("I_STB_O", i.stb),
  22                         Instance.Output("I_WE_O", i.we),
  23                         Instance.Output("I_CTI_O", i.cti),
  24                         Instance.Output("I_LOCK_O", BV(1)),
  25                         Instance.Output("I_BTE_O", i.bte),
  26                         Instance.Input("I_DAT_I", i.dat_r),
  27                         Instance.Input("I_ACK_I", i.ack),
  28                         Instance.Input("I_ERR_I", i.err),
  29                         Instance.Input("I_RTY_I", BV(1)),
  30
  31                         Instance.Output("D_ADR_O", BV(32)),
  32                         Instance.Output("D_DAT_O", d.dat_w),
  33                         Instance.Output("D_SEL_O", d.sel),
  34                         Instance.Output("D_CYC_O", d.cyc),
  35                         Instance.Output("D_STB_O", d.stb),
  36                         Instance.Output("D_WE_O", d.we),
  37                         Instance.Output("D_CTI_O", d.cti),
  38                         Instance.Output("D_LOCK_O", BV(1)),
  39                         Instance.Output("D_BTE_O", d.bte),
  40                         Instance.Input("D_DAT_I", d.dat_r),
  41                         Instance.Input("D_ACK_I", d.ack),
  42                         Instance.Input("D_ERR_I", d.err),
  43                         Instance.Input("D_RTY_I", BV(1)))
  44
  45         def get_fragment(self):
  46                 comb = [
  47                         self._inst.get_io("I_RTY_I").eq(0),
  48                         self._inst.get_io("D_RTY_I").eq(0),
  49                         self.ibus.adr.eq(self._inst.get_io("I_ADR_O")[2:]),
  50                         self.dbus.adr.eq(self._inst.get_io("D_ADR_O")[2:])
  51                 ]
  52                 return Fragment(comb=comb, instances=[self._inst])