///////////////////////////////////////////////////////////////////////
//
// addlatch module
//            transparent latch stores Address.
//
//
///////////////////////////////////////////////////////////////////////


module addlatch (  Address_bus, Data_bus, ALE );

timeunit 1ns;
timeprecision 100ps;

output [15:0] Address_bus;
input [15:0] Data_bus;
input ALE;

specify
  specparam tViolate=250;
  $setuphold(negedge ALE, Data_bus, tViolate, tViolate);
  $width(posedge ALE, tViolate);
  $width(negedge ALE, tViolate);
endspecify

reg [15:0] Address_bus;

always_latch
  if (ALE == 1)
    Address_bus = Data_bus;

endmodule