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