///////////////////////////////////////////////////////////////////////
//
// demux_bus interface
//
//    this interface describes the signals in the demultiplexed bus
//
///////////////////////////////////////////////////////////////////////

interface demux_bus(
  output nIRQ,
  output nWait,
  inout [15:0] Data,
  output logic [15:0] Address,
  input ALE,
  input nME,
  input nOE,
  input RnW
  );

timeunit 1ns;
timeprecision 100ps;

  modport AddressDecode (
    input Address,
    input nME
    );

  modport Slave (
    output nWait,
    inout Data,
    input Address,
    input nOE,
    input RnW
    );

  modport InterruptSlave (
    output nIRQ,
    output nWait,
    inout Data,
    input Address,
    input nOE,
    input RnW
    );

  modport Observer (
    input nIRQ,
    input nWait,
    input Data,
    input Address,
    input ALE,
    input nOE,
    input RnW,
    input nME
    );

always_latch
  if (ALE == 1)
    Address = Data;


endinterface