milkymist/lm32/__init__.py

   1 from migen.fhdl.structure import *
   2 from migen.bus import wishbone
   3
   4 class Inst:
   5         def __init__(self):
   6                 self.ibus = i = wishbone.Master("lm32i")
   7                 self.dbus = d = wishbone.Master("lm32d")
   8                 self.interrupt = Signal(BV(32))
   9                 self.ext_break = Signal()
  10                 self._inst = Instance("lm32_top",
  11                         [("I_ADR_O", i.adr_o),
  12                         ("I_DAT_O", i.dat_o),
  13                         ("I_SEL_O", i.sel_o),
  14                         ("I_CYC_O", i.cyc_o),
  15                         ("I_STB_O", i.stb_o),
  16                         ("I_WE_O", i.we_o),
  17                         ("I_CTI_O", i.cti_o),
  18                         ("I_LOCK_O", BV(1)),
  19                         ("I_BTE_O", i.bte_o),
  20                         ("D_ADR_O", d.adr_o),
  21                         ("D_DAT_O", d.dat_o),
  22                         ("D_SEL_O", d.sel_o),
  23                         ("D_CYC_O", d.cyc_o),
  24                         ("D_STB_O", d.stb_o),
  25                         ("D_WE_O", d.we_o),
  26                         ("D_CTI_O", d.cti_o),
  27                         ("D_LOCK_O", BV(1)),
  28                         ("D_BTE_O", d.bte_o)],
  29                         [("interrupt", self.interrupt),
  30                         #("ext_break", self.ext_break),
  31                         ("I_DAT_I", i.dat_i),
  32                         ("I_ACK_I", i.ack_i),
  33                         ("I_ERR_I", i.err_i),
  34                         ("I_RTY_I", BV(1)),
  35                         ("D_DAT_I", d.dat_i),
  36                         ("D_ACK_I", d.ack_i),
  37                         ("D_ERR_I", d.err_i),
  38                         ("D_RTY_I", BV(1))],
  39                         [],
  40                         "clk_i",
  41                         "rst_i",
  42                         "lm32")
  43
  44         def get_fragment(self):
  45                 comb = [
  46                         self._inst.ins["I_RTY_I"].eq(0),
  47                         self._inst.ins["D_RTY_I"].eq(0)
  48                 ]
  49                 return Fragment(comb=comb, instances=[self._inst])