-- Copyright © 1993 by  McGraw-Hill, Inc. and Zainalabedin Navabi

-- FIGURE 7.40-a 




-- ENTITY DECLERATION OF 2-INPUT NAND TEST BENCH :

ENTITY test_nand2 IS END test_nand2;
--



-- TEST BENCH FOR 2-INPUT NAND WITH OPEN COLLECTOR OUTPUT :

USE WORK.basic_utilities.ALL;
ARCHITECTURE input_output OF test_nand2 IS
  COMPONENT nand2 PORT (a, b : IN qit; y : OUT qit); END COMPONENT;
  FOR ALL : nand2 USE ENTITY WORK.nand2 (open_output);
  SIGNAL aa, bb, yy : qit;
BEGIN
  assign_bits (aa, "qit_data", 500 NS);
  assign_bits (bb, "qit_data", 750 NS);
  c1: nand2 PORT MAP (aa, bb, yy);
END input_output;
--