Embedded system custom single purpose processors

Dec 22, 2013Download as ppt, pdf4 likes8,455 views

The document discusses several topics related to digital circuits and processors: - Custom single-purpose processors are designed for a specific computation task and can be fast, small and low power but require more design time and are less flexible than general purpose processors. - Combinational logic circuits have outputs determined solely by current inputs while sequential logic circuits have memory of past inputs. - The document also discusses CMOS transistors, basic logic gates, and the design of combinational and sequential logic circuits.

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Embedded system custom single purpose processors

Chapter 4 Custom Single
Purpose Processors

Processor
•
•
•
•
•
•

•

Digital circuit that performs a computation tasks
Controller and datapath
General-purpose: variety of computation tasks
Single-purpose: one particular computation task
Custom single-purpose: non-standard task
A custom single-purpose processor may be
– Fast, small, low power
– But, high NRE, longer time-to-market, less flexible

CMOS transistor on silicon
•

Transistor
– The basic electrical component in digital systems
– Acts as an on/off switch
– Voltage at “gate” controls whether current flows from source to drain
– Don’t confuse this “gate” with a logic gate

CMOS transistor implementations

•
•
•

•

Complementary Metal Oxide Semiconductor
We refer to logic levels
– Typically 0 is 0V, 1 is 5V
Two basic CMOS types
– nMOS conducts if gate=1
– pMOS conducts if gate=0
– Hence “complementary”
Basic gates
– Inverter, NAND, NOR

Combinational Circuit
•
•

A combinational circuit is a digital circuit whose output is purely a
function of its current inputs;
such a circuit has no memory of past inputs.

Sequential Logic Design
Design task
• Define system functionality
• Convert functionality to physical implementation while
• Satisfying constrained metrics
• Optimizing other design metrics
• Designing embedded systems is hard
• Complex functionality
• Millions of possible environment scenarios
• Given this implementation model
– Sequential logic design quickly reduces to combinational logic design

Survey and Reading by students (18 mins.)

Survey:
Define custom single purpose processors.
Mention the components of combinational logic.
Mention the components of sequential logic.
List out the steps involved in creating a data path.
List out the steps in creating a controller.

Reading:
1. What are the steps in creating FSM?
2. List out the basic logic gates?
Guided Reading with hints
Page No.: 68-74

Summary (5 mins.)
•

•
•
•
•
•

Custom single-purpose processors
– Combinational logic
– Sequential logic
• Sequential components
• Creating data path and controller
• FSM
– Hardware
• Processor
• CMOS transistor on silicon
Straightforward design techniques
Can be built to execute algorithms
Typically start with FSMD
Optimizing Single purpose processors
CAD tools can be of great assistance

Gazing/Rote memory: (2 mins)

•
•
•
•
•
•

Combinational logic
Combinational logic components
Sequential logic
Sequential logic components
Custom single-purpose processor design
RT-level custom single-purpose processor design

Assessment (MCQ And higher order
questions)
1. Basic logic gates _________.
(a) NAND
(b) NOR
(c) NOT
(d) EXNOR
2. Drivers ,Inverters are __________ .
(a) OR and XOR
(b) AND and NOT
(c) XOR and XNOR
(d) OR and AND

3. CMOS stands for ___________ .
(a) Complementary Metal Oxide Semiconductor
(b) Complementary Metal Oxide Stub
(c) Complementary Metal Oxide Semi transistor
(d) None
4. A multiplexer is sometimes called as
.

(a) selector
(b) distributor
(c) transistor
(d) collector
5. The components of combinational logic is ______________
.
(a) Multiplexer
(b) Decoder
(c) ALU
(d) All the above

Two mark Questions:
State the benefits of custom single purpose processors.
Mention some of the combinational logic gates.
Define combinational logic design.
Mention the advantages and disadvantages in CMOS transistors.
Define the performance metric for throughput and time in embedded system.

[C] Descriptive Questions:
Explain combinational logic.
Differentiate the features of pMOs, CMOS and nMOS transistors.

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Embedded system custom single purpose processors

1. Alpha Breathing : (2 Mins) The three steps for alpha breathing are • Breathe in • Breathe out • Hold (Repeat the three steps for 8 times)

3. Chapter 4 Custom Single Purpose Processors

4. Processor • • • • • • • Digital circuit that performs a computation tasks Controller and datapath General-purpose: variety of computation tasks Single-purpose: one particular computation task Custom single-purpose: non-standard task A custom single-purpose processor may be – Fast, small, low power – But, high NRE, longer time-to-market, less flexible

6. Digital Camera

7. CMOS transistor on silicon • Transistor – The basic electrical component in digital systems – Acts as an on/off switch – Voltage at “gate” controls whether current flows from source to drain – Don’t confuse this “gate” with a logic gate

8. CMOS transistor implementations • • • • Complementary Metal Oxide Semiconductor We refer to logic levels – Typically 0 is 0V, 1 is 5V Two basic CMOS types – nMOS conducts if gate=1 – pMOS conducts if gate=0 – Hence “complementary” Basic gates – Inverter, NAND, NOR

9. Basic gates

10. Basic logic gates

11. Combinational Logic Design

13. Combinational Circuit • • A combinational circuit is a digital circuit whose output is purely a function of its current inputs; such a circuit has no memory of past inputs.

15. Sequential Logic Design Design task • Define system functionality • Convert functionality to physical implementation while • Satisfying constrained metrics • Optimizing other design metrics • Designing embedded systems is hard • Complex functionality • Millions of possible environment scenarios • Given this implementation model – Sequential logic design quickly reduces to combinational logic design

16. Improving Productivity

18. Brain Activation: (2 mins)

20. Survey and Reading by students (18 mins.) Survey: Define custom single purpose processors. Mention the components of combinational logic. Mention the components of sequential logic. List out the steps involved in creating a data path. List out the steps in creating a controller. Reading: 1. What are the steps in creating FSM? 2. List out the basic logic gates? Guided Reading with hints Page No.: 68-74

21. Discussion (9 mins.)

22. Reconstruct – Mind map (7 mins.)

23. Summary (5 mins.) • • • • • • Custom single-purpose processors – Combinational logic – Sequential logic • Sequential components • Creating data path and controller • FSM – Hardware • Processor • CMOS transistor on silicon Straightforward design techniques Can be built to execute algorithms Typically start with FSMD Optimizing Single purpose processors CAD tools can be of great assistance

24. Gazing/Rote memory: (2 mins) • • • • • • Combinational logic Combinational logic components Sequential logic Sequential logic components Custom single-purpose processor design RT-level custom single-purpose processor design

25. Assessment (MCQ And higher order questions) 1. Basic logic gates _________. (a) NAND (b) NOR (c) NOT (d) EXNOR 2. Drivers ,Inverters are __________ . (a) OR and XOR (b) AND and NOT (c) XOR and XNOR (d) OR and AND

26. 3. CMOS stands for ___________ . (a) Complementary Metal Oxide Semiconductor (b) Complementary Metal Oxide Stub (c) Complementary Metal Oxide Semi transistor (d) None 4. A multiplexer is sometimes called as . (a) selector (b) distributor (c) transistor (d) collector 5. The components of combinational logic is ______________ . (a) Multiplexer (b) Decoder (c) ALU (d) All the above

27. Two mark Questions: State the benefits of custom single purpose processors. Mention some of the combinational logic gates. Define combinational logic design. Mention the advantages and disadvantages in CMOS transistors. Define the performance metric for throughput and time in embedded system. [C] Descriptive Questions: Explain combinational logic. Differentiate the features of pMOs, CMOS and nMOS transistors.

Embedded system custom single purpose processors

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