Constants

Name

Constant - Easy way to instantiate constants

Synopsys

netOne  <=  One ( 2 )
    
net8    <= "8"

Description

These functions simplify the way to instanciate constants.

• The functions One andZero permits to initialise all the bits of a net to 'one' or 'zero'.
• The instanciation of a constant thanks to a string can be done in decimal, hecadecimal or binary.

Parameters

• For One and Zero :
  • n : the arity of the net
• For the instanciation of a constant :
  • the constant given must be a string representing :
    • A decimal number
    • A binary number : the string must begin with "0b"
    • An hexadecimal number : the string must begin with "0x"

Example

class essai ( Model ) :

  def Interface ( self ) :
    self.Ones   = SignalOut (   "ones", 2 )
    self.Zeros  = SignalOut (  "zeros", 4 )
    
    self.Eight  = SignalOut (  "eight", 4 )
    self.Twentu = SignalOut ( "twenty", 5 )
    self.Two    = SignalOut (    "two", 5 )

    self.Vdd = VddIn  ( "vdd" )
    self.Vss = VssIn  ( "vss" )
	
  def Netlist ( self ) :
    
    self.Ones  <=  One ( 2 )
    self.Zero  <= Zero ( 4 )
        
    self.Eight   <= "8"
    self.Twenty  <= "0x14"
    self.Two     <= "0b10"

Errors

Some errors may occur :

• [Stratus ERROR] Const :
the argument must be a string representing a number in decimal,
binary (0b) or hexa (0x).
  The string given as argument does not have the right form.

See Also

Introduction Netlist Instanciation of a multiplexor Instanciation of a shifter Instanciation of a register Boolean operations Arithmetical operations Comparison operations