milkymist/s6ddrphy/__init__.py

   1 from migen.fhdl.structure import *
   2 from migen.bus import dfi
   3
   4 class S6DDRPHY:
   5         def __init__(self, a, ba, d):
   6                 inst_items = [
   7                         Instance.Parameter("NUM_AD", a),
   8                         Instance.Parameter("NUM_BA", ba),
   9                         Instance.Parameter("NUM_D", d),
  10                         Instance.ClockPort("sys_clk")
  11                 ]
  12                 for name, width, cl in [
  13                         ("clk2x_270", 1, Instance.Input),
  14                         ("clk4x_wr", 1, Instance.Input),
  15                         ("clk4x_wr_strb", 1, Instance.Input),
  16                         ("clk4x_rd", 1, Instance.Input),
  17                         ("clk4x_rd_strb", 1, Instance.Input),
  18
  19                         ("sd_clk_out_p", 1, Instance.Output),
  20                         ("sd_clk_out_n", 1, Instance.Output),
  21                         ("sd_a", a, Instance.Output),
  22                         ("sd_ba", ba, Instance.Output),
  23                         ("sd_cs_n", 1, Instance.Output),
  24                         ("sd_cke", 1, Instance.Output),
  25                         ("sd_ras_n", 1, Instance.Output),
  26                         ("sd_cas_n", 1, Instance.Output),
  27                         ("sd_we_n", 1, Instance.Output),
  28                         ("sd_dq", d//2, Instance.InOut),
  29                         ("sd_dm", d//16, Instance.Output),
  30                         ("sd_dqs", d//16, Instance.InOut)
  31
  32                 ]:
  33                         s = Signal(BV(width), name=name)
  34                         setattr(self, name, s)
  35                         inst_items.append(cl(name, s))
  36
  37                 self.dfi = dfi.Interface(a, ba, d, 2)
  38                 inst_items += [Instance.Input(name, signal)
  39                         for name, signal in self.dfi.get_standard_names(True, False)]
  40                 inst_items += [Instance.Output(name, signal)
  41                         for name, signal in self.dfi.get_standard_names(False, True)]
  42
  43                 self._inst = Instance("s6ddrphy", *inst_items)
  44
  45         def get_fragment(self):
  46                 return Fragment(instances=[self._inst])