Digital design width CPLD Application and VHDL - Chapter 2

Logic Functions and Gates Tất cả các chức năng logic kỹ thuật số có thể được tổng hợp bởi sự kết hợp khác nhau của ba cơ bản logic chức năng: AND, OR, và NOT. Những cái gọi là chức năng Boolean là cơ sở cho tất cả các nghiên cứu hơn nữa của các mạch logic tổ hợp. (Tổ hợp logic mạch là mạch kỹ thuật số có kết quả đầu ra được chức năng của đầu vào, bất kể thứ tự đầu vào được áp dụng) mạch chuẩn, được gọi là cổng logic, đã được phát triển cho những điều này. | CHAPTER lllllllllll lllll llllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll Logic Functions and Gates OUTLINE CHAPTER OBJECTIVES Basic Logic Functions Logic Switches and LED Indicators Derived Logic Functions DeMorgan s Theorems and Gate Equivalence Enable and Inhibit Properties of Logic Gates Integrated Circuit Logic Gates Upon successful completion of this chapter you will be able to Describe the basic logic functions AND OR and NOT Draw simple switch circuits to represent AND OR and Exclusive OR functions. Draw simple logic switch circuits for single-pole single-throw SPST and normally open and normally closed pushbutton switches. Describe the use of light-emitting diodes LEDs as indicators of logic HIGH and LOW states. Describe those logic functions derived from the basic ones NAND NOR Exclusive OR and Exclusive NOR. Explain the concept of active levels and identify active LOW and HIGH terminals of logic gates. Choose appropriate logic functions to solve simple design problems. Draw the truth table of any logic gate. Draw any logic gate given its truth table. Draw the DeMorgan equivalent form of any logic gate. Determine when a logic gate will pass a digital waveform and when it will block the signal. Describe several types of integrated circuit packaging for digital logic gates. All digital logic functions can be synthesized by various combinations of the three basic logic functions AND OR and NOT. These so-called Boolean functions are the basis for all further study of combinational logic circuitry. Combinational logic circuits are digital circuits whose outputs are functions of their inputs regardless of the order the inputs are applied. Standard circuits called logic gates have been developed for these and for more complex digital logic functions. Logic gates can be represented in various .