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                 ins = []
   7                 outs = []
   8                 inouts = []
   9
  10                 for name in [
  11                         "clk2x_90",
  12                         "clk4x_wr",
  13                         "clk4x_wr_strb",
  14                         "clk4x_rd",
  15                         "clk4x_rd_strb"
  16                 ]:
  17                         s = Signal(name=name)
  18                         setattr(self, name, s)
  19                         ins.append((name, s))
  20
  21                 self._sd_pins = []
  22                 for name, width, l in [
  23                         ("sd_clk_out_p", 1, outs),
  24                         ("sd_clk_out_n", 1, outs),
  25                         ("sd_a", a, outs),
  26                         ("sd_ba", ba, outs),
  27                         ("sd_cs_n", 1, outs),
  28                         ("sd_cke", 1, outs),
  29                         ("sd_ras_n", 1, outs),
  30                         ("sd_cas_n", 1, outs),
  31                         ("sd_we_n", 1, outs),
  32                         ("sd_dq", d//2, inouts),
  33                         ("sd_dm", d//16, outs),
  34                         ("sd_dqs", d//16, inouts)
  35
  36                 ]:
  37                         s = Signal(BV(width), name=name)
  38                         setattr(self, name, s)
  39                         l.append((name, s))
  40                         self._sd_pins.append(s)
  41
  42                 self.dfi = dfi.Interface(a, ba, d, 2)
  43                 ins += self.dfi.get_standard_names(True, False)
  44                 outs += self.dfi.get_standard_names(False, True)
  45
  46                 self._inst = Instance("s6ddrphy",
  47                         outs,
  48                         ins,
  49                         inouts,
  50                         [
  51                                 ("NUM_AD", a),
  52                                 ("NUM_BA", ba),
  53                                 ("NUM_D", d)
  54                         ],
  55                         clkport="sys_clk")
  56
  57         def get_fragment(self):
  58                 return Fragment(instances=[self._inst], pads=set(self._sd_pins))