EEL 3705 / 3705L Digital Logic Design

1. EEL 3705 / 3705LDigital Logic Design Fall 2006Instructor: Dr. Michael Frank M. Frank, EEL3705 Digital Logic, Fall 2006

2. Lecture Outline • Overview of the subject area: • What’s Digital Logic Design all about? • Overview of the course: • Syllabus, policies, procedures • Administrative matters: • Sign-in sheet, Prereq form, Blackboard, 1st assignment M. Frank, EEL3705 Digital Logic, Fall 2006

3. What do we mean by “Digital Logic Design?” • Digital • Using discrete physical states (e.g., on/off transistor, high/low voltage) to represent information • Logic • Using the basic operations of Boole’s algebra of logic to interpret, manipulate and process information • Design • To conceive, plan, analyze and construct the structure of working systems that will meet application requirements M. Frank, EEL3705 Digital Logic, Fall 2006

4. Applications of Digital Logic Design • All complex electronic systems today rely heavily on components whose design and operation is based (almost entirely) on digital logic principles, including: • Microprocessors and microcontrollers • The heart of the modern computer, and also embedded within all manner of other consumer and industrial electronic devices • Digital Signal Processors • Used in cellphones, cameras, networking equipment • FPGAs (Field-Programmable Gate Arrays) • Used for prototyping & in a wide range of equipment • ASICs (Application-Specific Integrated Circuits) • Semi-custom, used in many specialized applications M. Frank, EEL3705 Digital Logic, Fall 2006

5. Electrical & Computer Engineeringand the Design of Electronic Systems • Although electrical engineering and computer engineering are considered different disciplines, it’s important to always remember that any complex electronic component includes both: • Physical/electrical characteristics • Such as power, current, inductance, capacitance, etc. • Andcomputation-related characteristics • E.g., information content, logical function, software, protocols • To successfully design working systems requires multidisciplinary teams that understand and can take care of the engineering considerations on both sides! M. Frank, EEL3705 Digital Logic, Fall 2006

6. What does a modernDigital Logic Designer do? System-levelrequirements Functional design • Design engineering, in general, involves taking abstract, system-level requirements, and translating them into ever more concrete and specific designs for technological artifacts. • Digital Logic Design is no different. • In modern industrial practice, increasingly many of the steps of the design process have been automated. • This is true for digital functions especially. • See e.g. resources at eda.org • Today, computer-based tools do most of the “grunt work” and “heavy lifting” • But, the designer has to understand what the tools are doing in order to use them! Functional orbehavioralspecification Structuraldesign Schematic orstructuralspecification Logic design Gate-LevelDesign Designcompiler Circuit synthesis FPGAProgram Transistor-levelSchematics Loading Layout ConfiguredFPGA VLSI Mask Layers Fabrication Physical chip M. Frank, EEL3705 Digital Logic, Fall 2006

7. The Basis of Digital Logic today:The MOSFET • Nearly all digital systems today (2006) are based on an electronic device called the MOSFET • Metal-Oxide-Semiconductor Field-Effect Transistor • This device is a voltage-controlled switch • Two basic types of FET: • nFET: The dominant charge carriers are electrons (negative) • Conducts low voltages well • pFET: The dominant charge carriers are holes (positive) • Conducts high voltages well gate source drain nFET icon used in schematics M. Frank, EEL3705 Digital Logic, Fall 2006

8. Today’s Dominant Logic Style:CMOS • Most logic today is done in the CMOS (Complementary MOS) logic style • Each logic “gate” (hardware to do a given logic operation) is built using both nFETs and pFETs • nFETs pull output low, pFETs pull it high • Uses energy mainly only when switching • Here are a simple CMOS inverter circuit and its logic gate icon • When input is high (1) output is low (0) and vice-versa. • This and a few other simple gates are sufficient to build any digital system! Vdd (PWR) Vin Vout Vss (GND) in out = ¬in M. Frank, EEL3705 Digital Logic, Fall 2006

9. Course Overview • Go through syllabus posted on Blackboard M. Frank, EEL3705 Digital Logic, Fall 2006

10. Administrative Matters • Sign the attendance sheet being passed around… • Clearly print your preferred email address • Pick up and sign a prerequisite form… • Turn it in at the end of class • Make sure you are enrolled on Blackboard • Email Dr. Frank if you aren’t • Download the Quartus II software • Labs begin next week! M. Frank, EEL3705 Digital Logic, Fall 2006

11. First-Day Homework Assignment • To be completed by this Wednesday’s lecture • No time to waste! • The assignment is: 1. Turn in the signed course prerequisite form to Dr. Frank • Preferably, at the end of today’s lecture 2. Ensure you are enrolled for the course on Blackboard • Email instructor at mpf@eng.fsu.edu immediately if not 3. On your home or laptop computer, download & install the Quartus II software (web version) • Available from altera.com (see link on Blackboard) M. Frank, EEL3705 Digital Logic, Fall 2006