1 - University of Michigan
1 - University of Michigan
Design of Microprocessor-Based Systems
University of Michigan
Lecture 1: Introduction
September 7, 2010
What is an embedded system?
What is driving the
embedded everywhere explosion?
log (people per computer)
Bell’s Law of Computer Classes:
A new computing class roughly every decade
“Roughly every decade a new, lower priced computer
class forms based on a new programming platform,
network, and interface resulting in new usage and
the establishment of a new industry.”
D. Culler 7
IC transistor count doubles every two years
Photo Credit: Intel 8
Flash memory scaling:
Rise of density & volumes; Fall (and rise) of prices
Pixels per dollar doubles annually
Credit: Barry Hendy/Wikipedia
Rapidly falling price and power
25 µA @ 25 Hz
[Analog Devices, 2009]
10 µA @ 10 Hz @ 6 bits
[ST Microelectronics, annc. 2009] 11
MEMS Gyroscope Chip
J. Seeger, X. Jiang, and B. Boser
Energy harvesting and storage:
Small doesn’t mean powerless…
Clare Solar Cell
Shock Energy Harvesting
Energy Harvester [PNNL]
Bell’s Law, Take 2:
Corollary to the Laws of Scale
UMich Phoenix Processor
Initial clock speed
106 kHz @ 0.5V Vdd
Number of transistors
Photo credits: Intel, U. Michigan
Learning happens when assumptions
are challenged and invalidated, so…
Mobile phones: the most successful technology ever
What happened elsewhere now happens on the phone
What happens when you press the
power switch on your mobile phone?
Mobile phone system architecture
What’s inside a DSL modem?
What’s inside a DSL Modem?
1. Telephone decoupling electronics (for ADSL).
2. Multicolor LED (displaying network status).
3. Single color LED (displaying USB status).
4. Main processor, a TNETD7300GDU, TI ARM7.
5. JTAG (Joint Test Action Group) port.
6. RAM, a single ESMT M12L64164A 8 MB chip.
7. Flash memory, obscured by sticker.
8. Power supply regulator.
9. Main power supply fuse.
10. Power connector.
11. Reset button.
12. Quartz crystal.
13. Ethernet port.
14. Ethernet transformer, Delta LF8505.
15. KS8721B Ethernet PHY.
16. USB port.
17. Telephone (RJ11) port.
18. Telephone connector fuses.
Why study 32-bit MCUs and FPGAs?
MCU-32 and PLDs are tied in embedded market share
Why study the ARM architecture
(and the Cortex-M3 in particular)?
Lots of manufacturers ship ARM products
What differentiates these
products from one another?
The difference is…
A embedded systems design example:
Turning the mobile phone into an oscilloscope
Integrating power, data, and processing
1” x 1”
(see homepage for contact info, office hours)
• EECS 270: Introduction to Logic Design
– Combinational and sequential logic design
– Logic minimization, propagation delays, timing
• EECS 280: Programming and Intro Data Structures
– C programming
– Algorithms (e.g. sort) and data structures (e.g. lists)
• EECS 370: Introduction to Computer Organization
– Basic computer architecture
– CPU control/datapath, memory, I/O
– Compiler, assembler
Course Syllabus (tentative)
• See course homepage:
– 50%: Lab-centric
– 50%: Project-centric
FPGA + Hardware Tools
MCU + Software Tools
Memory + Memory-Mapped I/O
Timers and Counters
Serial Bus Interfacing
Data Converters (e.g. ADCs/DACs)
• Start TODAY!
• Tutorials to familiarize you ARM, Actel tools
• Should be fun
– Learn how to sensor/control physical world
– Build hardware (include PCBs)
• Should be instructive
Program in Verilog
Program in C, and assembly
Learn debugging skills
Learn how to interface peripherals to the CPU/MCU
• Are challenging and time-consuming - plan ahead
• Goal: learn how to build embedded systems
By building an embedded system
Work in teams
Pick a problem of your own interest
Meet with instructors to discuss other ideas
• Should be related to the class and emphasize topics
• Scope of project must grow with size of team
• Midterm (October 21, 2010)
– Emphasize problem solving fundamentals
• Final (Date TBD)
– Cumulative topics
• Minute Quizzes
– Short, Random
– Over previous day’s material