src/soc/scoreboard/fu_picker_vec.py

   1 from nmigen import Elaboratable, Module, Signal, Cat
   2
   3
   4 class FU_Pick_Vec(Elaboratable):
   5     """ these are allocated per-FU (horizontally),
   6         and are of length fu_row_n
   7     """
   8     def __init__(self, fu_row_n):
   9         self.fu_row_n = fu_row_n
  10         self.rd_pend_i = Signal(fu_row_n, reset_less=True)
  11         self.wr_pend_i = Signal(fu_row_n, reset_less=True)
  12
  13         self.readable_o = Signal(reset_less=True)
  14         self.writable_o = Signal(reset_less=True)
  15
  16     def elaborate(self, platform):
  17         m = Module()
  18
  19         # Readable if there are no writes pending
  20         m.d.comb += self.readable_o.eq(~self.wr_pend_i.bool())
  21
  22         # Writable if there are no reads pending
  23         m.d.comb += self.writable_o.eq(~self.rd_pend_i.bool())
  24
  25         return m
  26