DpgenNul

• Name : DpgenNul - Zero Detector Macro-Generator
• Synopsys :

  Generate ( 'DpgenNul', modelname
           , param = { 'nbit'     : n
                     , 'physical' : True         
                     }
           )
  

• Description : Generates a n bits zero detector named modelname.
• Terminal Names :
  • i0 : value to check (input, n bits)
  • q : null flag (1 bit)
  • vdd : power
  • vss : ground
• Parameters : Parameters are given in the map param.
  • nbit (mandatory) : Defines the size of the generator
  • physical (optional, default value : False) : In order to generate a layout
• Behavior :

  q <= '1' WHEN ( i0 = X"00000000" ) ELSE '0';
  

• Example :

  from stratus import *
  
  class inst_nul ( Model ) :
  
    def Interface ( self ) :
      self.i = SignalIn  ( "i", 4 )
      self.o = SignalOut ( "o", 1 )
      
      self.vdd = VddIn ( "vdd" )
      self.vss = VssIn ( "vss" )
      
    def Netlist ( self ) :
      Generate ( 'DpgenNul', 'nul_4'
               , param = { 'nbit'     : 4
                         , 'physical' : True
                         }
               )
      self.I = Inst ( 'nul_4', 'inst'
                     , map = { 'i0'  : self.i
                             , 'nul' : self.o
                             , 'vdd' : self.vdd
                             , 'vss' : self.vss
                             }
                     )
        
    def Layout ( self ) :
      Place ( self.I, NOSYM, Ref(0, 0) )