src/soc/scoreboard/fu_wr_pending.py

   1 from nmigen import Elaboratable, Module, Signal, Array
   2
   3
   4 class FU_RW_Pend(Elaboratable):
   5     """ these are allocated per-FU (horizontally),
   6         and are of length reg_count
   7     """
   8     def __init__(self, reg_count, n_src):
   9         self.n_src = n_src
  10         self.reg_count = reg_count
  11         self.dest_fwd_i = Signal(reg_count, reset_less=True)
  12         src = []
  13         for i in range(n_src):
  14             j = i + 1 # name numbering to match src1/src2
  15             src.append(Signal(reg_count, name="src%d" % j, reset_less=True))
  16         self.src_fwd_i = Array(src)
  17
  18         self.reg_wr_pend_o = Signal(reset_less=True)
  19         self.reg_rd_pend_o = Signal(reset_less=True)
  20         self.reg_rd_src_pend_o = Signal(n_src, reset_less=True)
  21
  22     def elaborate(self, platform):
  23         m = Module()
  24         m.d.comb += self.reg_wr_pend_o.eq(self.dest_fwd_i.bool())
  25         for i in range(self.n_src):
  26             m.d.comb += self.reg_rd_src_pend_o[i].eq(self.src_fwd_i[i].bool())
  27         m.d.comb += self.reg_rd_pend_o.eq(self.reg_rd_src_pend_o.bool())
  28         return m
  29