src/bsv/peripheral_gen/sdram.py

   1 from bsv.peripheral_gen.base import PBase
   2
   3
   4 class sdram(PBase):
   5
   6     def slowimport(self):
   7         return "import sdr_top::*;"
   8
   9     def num_axi_regs32(self):
  10         return 0x400000  # defines an entire memory range
  11
  12     def extfastifinstance(self, name, count):
  13         return "// TODO" + self._extifinstance(name, count, "_out", "", True,
  14                                    ".if_sdram_out")
  15
  16     def fastifdecl(self, name, count):
  17         return "// (*always_ready*) interface " + \
  18                 "Ifc_sdram_out sdr{0}_out;".format(count)
  19
  20     def get_clock_reset(self, name, count):
  21         return "slow_clock, slow_reset"
  22
  23     def mkfast_peripheral(self):
  24         return "Ifc_sdr_slave sdr{0} <- mksdr_axi4_slave(clk0);"
  25
  26     def _mk_connection(self, name=None, count=0):
  27         return ["sdr{0}.axi4_slave_sdram",
  28                 "sdr{0}.axi4_slave_cntrl_reg"]
  29
  30
  31     def pinname_in(self, pname):
  32         return {'ta': 'sdram_side.m_tAn',
  33                 }.get(pname, '')
  34
  35     def pinname_out(self, pname):
  36         return {'ale': 'sdram_side.m_ALE',
  37                 'oe': 'sdram_side.m_OEn',
  38                 'tbst': 'sdram_side.m_TBSTn',
  39                 'rw': 'sdram_side.m_R_Wn',
  40                 }.get(pname, '')
  41
  42     def _mk_clk_con(self, name, count, ctype):
  43         ret = [PBase._mk_clk_con(self, name, count, ctype)]
  44         for pname, sz, ptype in [
  45             ('cs', 6, 'out'),
  46             ('bwe', 4, 'out'),
  47             ('tsiz', 2, 'out'),
  48             ('ad_out', 32, 'out'),
  49             ('ad_in', 32, 'in'),
  50             ('ad_out_en', 32, 'out'),
  51         ]:
  52             bitspec = "Bit#(%d)" % sz
  53             txt = self._mk_clk_vcon(name, count, ctype, ptype, pname, bitspec)
  54             ret.append(txt)
  55         return '\n'.join(ret)
  56
  57     def _mk_pincon(self, name, count, typ):
  58         ret = [PBase._mk_pincon(self, name, count, typ)]
  59         assert typ == 'fast' # TODO slow?
  60         for pname, stype, ptype in [
  61             ('cs', 'm_FBCSn', 'out'),
  62             ('bwe', 'm_BWEn', 'out'),
  63             ('tsiz', 'm_TSIZ', 'out'),
  64             ('ad_out', 'm_AD', 'out'),
  65             ('ad_in', 'm_din', 'in'),
  66             ('ad_out_en', 'm_OE32n', 'out'),
  67         ]:
  68             ret.append(self._mk_vpincon(name, count, typ, ptype, pname,
  69                                         "sdram_side.{0}".format(stype)))
  70
  71         return '\n'.join(ret)