co design.ppt

7/25/2019 co design.ppt

1/18

Hardware/Software Co-Hardware/Software Co-

DesignDesign


2/18

T S PT S P 22

Embedded SystemsEmbedded Systems

Satellite

Macro-Cell Micro-Cell

Zone 2: UrbanZone 1: In-Building

Pico-Cell

Zone 4: Global

Zone 3: Suburban

Firmware

CORE

SOC IPBased esign

Software

SOC

P!C"nalog

#$bedded So%t&are

Me$or'#$beddedS'ste$ esign

S'ste$#n(iron$ent

PCBesign


3/18

T S PT S P 33

Embedded HardwareEmbedded Hardware

InputInput SensorsSensors Sample and Hold CircuitSample and Hold Circuit A/D ConvertersA/D Converters

CommunicationCommunication UA!UA!

"rocessing Units"rocessing Units ASICASIC "rocessors"rocessors econ#gurable processorsecon#gurable processors


4/18

T S PT S P 44

Embedded HardwareEmbedded Hardware

$emories$emories A$% &$% 'las(% Cac(eA$% &$% 'las(% Cac(e

&utput&utput D/A Converters%D/A Converters%

ActuatorsActuators


5/18

T S PT S P 55

Embedded SoftwareEmbedded Software

eal !ime &perating Systemseal !ime &perating Systems )eneral e*uirements)eneral e*uirements

Sc(eduling in !&SSc(eduling in !&S AperiodicAperiodic "eriodic"eriodic

eal !ime Databaseseal !ime Databases &t(er Software Arc(itectures&t(er Software Arc(itectures

'unction +ueue Sc(eduling'unction +ueue Sc(eduling ound obin ,wit( Interruptsound obin ,wit( Interrupts


6/18

T S PT S P 66

Issues w(ile Designing ESIssues w(ile Designing ES

C(oosing ig(t platformC(oosing ig(t platform

$emory and I/& e*uirements$emory and I/& e*uirements .D!% Cac(e% 'las( memory% etc.D!% Cac(e% 'las( memory% etc

"rocessors C(oice"rocessors C(oice "C"C

$icro Controller or DS"$icro Controller or DS"

ASIC or '")AASIC or '")A


7/18

T S PT S P 77

Hardware /SoftwareHardware /Software

"artitioning"artitioning De#nitionDe#nition

A H./S. partitioning algorit(mA H./S. partitioning algorit(m

implements aimplements a specifcationspecifcationon someon somesort ofsort of multiprocessor architecturemultiprocessor architecture

UsuallyUsually

$ultiprocessor arc(itecture 0 one C"U 1$ultiprocessor arc(itecture 0 one C"U 1some ASICs on C"U bussome ASICs on C"U bus


8/18

T S PT S P 88

Hardware /SoftwareHardware /Software

"artitioning"artitioning Hw/Sw partitioning can speedupHw/Sw partitioning can speedup

softwaresoftware

Can reduce energy tooCan reduce energy too

In most partitioning algorit(msIn most partitioning algorit(ms!ype of C"U is #2ed and given!ype of C"U is #2ed and given

ASICs must be synt(esi3edASICs must be synt(esi3ed


9/18

T S PT S P 99

Embedded System DesignEmbedded System Design

!raditional $et(odology!raditional $et(odology

HW Design& Build

Hardware/Software

Partitioning and Allocation

SW Design& Code

Interface

Design

HW/SW

Integration


10/18

T S PT S P 1010

Embedded System DesignEmbedded System Design

H./S. Co-Design $et(odologyH./S. Co-Design $et(odology

HW Design& Build

Hardware/Software

Partitioning and Allocation

SW Design& Code

Interface

Design

HW/SW

Integration


11/18

T S PT S P 1111

Co-DesignCo-Design

!(e software functionality s(ould be!(e software functionality s(ould be

partitioned in suc( a fas(ion t(atpartitioned in suc( a fas(ion t(at

processors in t(e system do not getprocessors in t(e system do not getoverloaded w(en t(e system isoverloaded w(en t(e system is

operating at pea4 capacity5operating at pea4 capacity5

!(is involves simulating t(e system!(is involves simulating t(e systemwit( t(e proposed software andwit( t(e proposed software and

(ardware arc(itecture5(ardware arc(itecture5


12/18

T S PT S P 1212

Co-DesignCo-Design

!(e system s(ould be designed for!(e system s(ould be designed for

future growt( by considering a scalablefuture growt( by considering a scalable

arc(itecture% i5e5 system capacity canarc(itecture% i5e5 system capacity canbe increased by adding new (ardwarebe increased by adding new (ardware

modules5 !(e system will not scalemodules5 !(e system will not scale

very well if some (ardware or softwarevery well if some (ardware or software

module becomes a bottlenec4 inmodule becomes a bottlenec4 in

increasing system capacity5increasing system capacity5


13/18

T S PT S P 1313

Embedded Controller E2ample6Embedded Controller E2ample6

Engine Control Unit ,ECUEngine Control Unit ,ECU Task: control the torque produced

by the engine

by timing uel injection and spark

$a7or constraints6$a7or constraints6

ow fuel consumptionow fuel consumption

ow e2(aust emissionow e2(aust emission


14/18

T S PT S P 1414

ECUECU Task: control injection time (3 sub-tasks)

compute

air o! computeinjection

timedri"e

actuators

airo!

injectiontimeair temperature

engine temperature

engine speed

throttle position

look-up table

#$% signalsair pressure


15/18

T S PT S P 1515

3& bit '#

*+

ctuations (#$%)

nalog inputs

+igital inputs

ECU- &ption 8ECU- &ption 8

computeair o!

computeinjection

timedri"e

actuators

airo!

injectiontime

air temperature

engine temperature

engine speed

throttle position

look-up table



16/18

T S PT S P 1616

, bit '#

*+

ctuations (#$%)

nalog inputs

+igital inputs

.#/

ECU- &ption 9ECU- &ption 9

computeair o!

computeinjection

timedri"e

actuators

airo!

injectiontime

air temperature

engine temperature

engine speed

throttle position

look-up table



17/18

T S PT S P 1717

0 bit '#+1#

ctuations (#$%)

naloginputs

+igital inputs

.#/*+

ECU- &ption :ECU- &ption :

computeair o!

computeinjection

timedri"e

actuators

airo!

injectiontime

air temperature

engine temperature

engine speed

throttle position

look-up table



18/18

T S PT S P 1818

!(an4 ;ou!(an4 ;ou

co design.ppt

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