parallel architecture

8/3/2019 Parallel Architecture

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(ARM7 & 8051)

Guided by Prof. Rajeev Kapoor (HOD ECE,DTU)Prepared By Meharban Singh & Mayank Kumar


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To give us a head start in the field ofembedded systems using ParallelArchitecture.

Sequential processing has always been abottle neck to the speed of computation. Abetter alternative is to use multipleprocessing elements simultaneously.


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A parallel architecture is a collection of processingelements that cooperate and communicate to solve large

problems fast.

Parallel architecture is a form of architecture in

which many calculations are carried outsimultaneously operating on the principle that

large problems can often be divided into smallerones, which are then solved concurrently .


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To solve larger problems. To save time.

To provide concurrency.

To get higher throughput.


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3 Issues to characterize parallel machines1) Naming

2) Synchronization

3) Latency


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Bit level parallelism. Instruction parallelism.

Data parallelism.

Task level parallelism.


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Multi Core. Multi Processor.

Network.

MPPs. Grids.


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Shared memory. Message Passing.


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ARM7 acts as the main processor and takesall the inputs from the external world.

8051 takes orders from ARM7 and furthercontrols to other modules.


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Power supply (12V, 5V, 3.3V). H-Bridge.

DC motors.

Logic Converter. ARM7 interfacing board.

Remote control.

8051 interfacing board.

APR 9600. 16 pin LCD.


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Takes input from remote control. Moves in the corresponding direction.

Displays the direction on LCD.

Speaks the corresponding direction.


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Continuously monitors the input pins. Whenever a button on the remote control is

pressed it: Moves the platform in the corresponding direction.

Simultaneously orders 8051 to perform the functionsallotted to it.


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Takes orders from ARM7 Whenever a trigger signal is received from

ARM7: Transfers data to data pins of LCD.

Instructs the LCD- Controller display the information.

Simultaneously instructs APR 9600 to read prerecorded data from its on chip memory and give theoutput in the form of an audio signal.


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Scanning of keys

by polling.Key pressed.

Start Moving the

platform.

Order 9600 for

audio.

Move data to

LCD.

Instruct LCD to

display the data.

Stop the moving

platform when

key released.


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ARM7

Scanning of input pins

Key pressed

Signal to 8051

Move the platform

Stop the platform when

key released

8051

Transfer data on LCD

Display data on LCD

Order 9600 to speak


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Circuit Diagram


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enables DC electric motors to run forwards orbackwards


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When the switches S1 and S4 (according to the firstfigure) are closed (and S2 and S3 are open) a

positive voltage will be applied across the motorand negative voltage is generated when S2 and S3are closed.

Fig. The two basic states of a H-bridge


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DC motors operate at 12V while the othercircuit operates at lower voltages.

To prevent damage due to back EMF.


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ARM7 and 8051 operate at different voltages. Arm7 operates at 3.3V.

8051 Operates at 5V.

In order to allow communication between twologics we require a Logic converter.


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Mal functioning of LCDIncreased delay due to increased length of

signal path.

Inter processor communication:

Due to difference in logic levels.


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To integrate voice recognition. To Integrate camera and implement some

recognition algorithm to enable automatednavigation.

To program ARM7 using RTOS for advancedfunctionality.

To design the circuit on a PCB for better

durability and compactness.


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ARM7 LPC2138 data sheet. Janta board manual.

7805 data sheet.

LM117 data sheet.

Optical coupler data sheet. ARM system developers guide.

embeddedmarket.com.

Flashmagictool.com

APR 9600 datasheet. ARM7 developers guide.

Guidance from Prof. Rajeev Kapoor.


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parallel architecture

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