tailieunhanh - Digital design width CPLD Application and VHDL

Digital electronics is the branch of electronics based on the combination and switching of voltages called logic levels. Any quantity in the outside world, such as temperature, pressure, or voltage, can be symbolized in a digital circuit by a group of logic voltages that, taken together, represent a binary number. Each logic level corresponds to a digit in the binary (base 2) number system. The binary digits, or bits, 0 and 1, are sufficient to write any number, given enough places. The hexadecimal (base 16) number system is also important in digital systems. Since every combination of four binary digits can be uniquely represented as a. | CHAPTER IIIIIIIIIII 1 IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Basic Principles of Digital Systems OUTLINE CHAPTER OBJECTIVES Digital Versus Analog Electronics Digital Logic Levels The Binary Number System Hexadecimal Numbers Digital Waveforms Upon successful completion of this chapter you will be able to Describe some differences between analog and digital electronics. Understand the concept of HIGH and LOW logic levels. Explain the basic principles of a positional notation number system. Translate logic HIGHs and LOWs into binary numbers. Count in binary decimal or hexadecimal. Convert a number in binary decimal or hexadecimal to any of the other number bases. Calculate the fractional binary equivalent of any decimal number. Distinguish between the most significant bit and least significant bit of a binary number. Describe the difference between periodic aperiodic and pulse waveforms. Calculate the frequency period and duty cycle of a periodic digital waveform. Calculate the pulse width rise time and fall time of a digital pulse. Digital electronics is the branch of electronics based on the combination and switching of voltages called logic levels. Any quantity in the outside world such as temperature pressure or voltage can be symbolized in a digital circuit by a group of logic voltages that taken together represent a binary number. Each logic level corresponds to a digit in the binary base 2 number system. The binary digits or bits 0 and 1 are sufficient to write any number given enough places. The hexadecimal base 16 number system is also important in digital systems. Since every combination of four binary digits can be uniquely represented as a hexadecimal digit this system is often used as a compact way of writing binary information. Inputs and outputs in digital circuits are not always

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