TLB/CamEntry.py

   1 from nmigen import Module, Signal
   2 from nmigen.cli import main
   3
   4 class CamEntry():
   5     def __init__(self, key_size, data_size):
   6         # Internal
   7         key = Signal(key_size)
   8
   9         # Input
  10         self.write = Signal(1) # Read => 0 Write => 1
  11         self.key_in = Signal(key_size) # Reference key for the CAM
  12         self.data_in = Signal(data_size) # Data input when writing
  13
  14         # Output
  15         self.match = Signal(1) # Result of the internal/input key comparison
  16         self.data = Signal(data_size)
  17
  18
  19     def elabotate(self, platform):
  20         m = Module()
  21         m.d.comb += [
  22             If(self.write == 1,
  23                key.eq(self.key_in),
  24                self.data.eq(self.data_in)
  25             ).Else(
  26                 If(self.key_in == key,
  27                    self.match.eq(0)
  28                 ).Else(
  29                     self.match.eq(1)
  30                 )
  31             )
  32         ]
  33         return m