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     def pinname_out(self, pname):
  32         return {'sdrwen': 'ifc_sdram_out.osdr_we_n',
  33                 'sdrcsn0': 'ifc_sdram_out.osdr_cs_n',
  34                 'sdrcke': 'ifc_sdram_out.osdr_cke',
  35                 'sdrrasn': 'ifc_sdram_out.osdr_ras_n',
  36                 'sdrcasn': 'ifc_sdram_out.osdr_cas_n',
  37                 }.get(pname, '')
  38
  39     def _mk_clk_con(self, name, count, ctype):
  40         ret = [PBase._mk_clk_con(self, name, count, ctype)]
  41         for pname, sz, ptype in [
  42             ('cs', 6, 'out'),
  43             ('bwe', 4, 'out'),
  44             ('tsiz', 2, 'out'),
  45             ('ad_out', 32, 'out'),
  46             ('ad_in', 32, 'in'),
  47             ('ad_out_en', 32, 'out'),
  48         ]:
  49             bitspec = "Bit#(%d)" % sz
  50             txt = self._mk_clk_vcon(name, count, ctype, ptype, pname, bitspec)
  51             ret.append(txt)
  52         return '\n'.join(ret)
  53
  54     def _mk_pincon(self, name, count, typ):
  55         ret = [PBase._mk_pincon(self, name, count, typ)]
  56         assert typ == 'fast' # TODO slow?
  57         for pname, stype, ptype in [
  58             ('sdrdqm', 'osdr_dqm', 'out'),
  59             ('sdrba', 'osdr_ba', 'out'),
  60             ('sdrad', 'osdr_addr', 'out'),
  61             ('sdrd_out', 'osdr_dout', 'out'),
  62             ('sdrd_in', 'ipad_sdr_din', 'in'),
  63             ('sdrd_out_en', 'osdr_den_n', 'out'),
  64         ]:
  65             ret.append(self._mk_vpincon(name, count, typ, ptype, pname,
  66                                         "ifc_sdram_out.{0}".format(stype)))
  67
  68         return '\n'.join(ret)