Quality attributes of Embedded Systems
- 1. QUALITY ATTRIBUTES OF EMBEDDED SYSTEM 4 SEM - 18CS44 - Microcontrollers & Embedded Systems 5/15/2020
- 2. QUALITY ATTRIBUTES Quality attributes are the non-functional requirements that need to be documented properly in any Embedded system design. The various Quality attributes that needs to be addressed in any Embedded system development are broadly classified into Operational Quality attribute ad Non-Operational quality attributes. 5/15/20204 SEM - 18CS44 - Microcontrollers & Embedded Systems
- 3. 1. Operational Quality Attributes. – These are attributes related to operation or functioning of an embedded system. The way an embedded system operates affects its overall quality. – There are 6 Operational Quality Attributes 5/15/20204 SEM - 18CS44 - Microcontrollers & Embedded Systems
- 4. a)Response – Response is a measure of quickness of the system. – It gives you an idea about how fast your system is tracking the input variables. – Most of the embedded system demand fast response which should be real-time. b)Throughput – Throughput deals with the efficiency of system. – It can be defined as rate of production or process of a defined process over a stated period of time. – In case of card reader like the ones used in buses, throughput means how much transaction the reader can perform in a minute or hour or day. 5/15/20204 SEM - 18CS44 - Microcontrollers & Embedded Systems
- 5. c)Reliability • Reliability is a measure of how much percentage you rely upon the proper functioning of the system . • Mean Time between failures and Mean Time To Repair are terms used in defining system reliability. • Mean Time between failures can be defined as the average time the system is functioning before a failure occurs. • Mean time to repair can be defined as the average time the system has spent in repairs. 5/15/20204 SEM - 18CS44 - Microcontrollers & Embedded Systems
- 6. d)Maintainability – Maintainability deals with support and maintenance to the end user or a client in case of technical issues and product failures or on the basis of a routine system checkup – It can be classified into two types :- • Scheduled or Periodic Maintenance – This is the maintenance that is required regularly after a periodic time interval. – Example : Periodic Cleaning of Air Conditioners Refilling of printer cartridges. • Maintenance to unexpected failure – This involves the maintenance due to a sudden breakdown in the functioning of the system. – Example: – Air conditioner not powering on – Printer not taking paper in spite of a full paper stack 5/15/20204 SEM - 18CS44 - Microcontrollers & Embedded Systems
- 7. e) Security – Confidentiality, Integrity and Availability are three corner stones of information security. – Confidentiality deals with protection data from unauthorized disclosure. – Integrity gives protection from unauthorized modification. – Availability gives protection from unauthorized user – Certain Embedded systems have to make sure they conform to the security measures. – Ex. An Electronic Safety Deposit Locker can be used only with a pin number like a password. 5/15/20204 SEM - 18CS44 - Microcontrollers & Embedded Systems
- 8. f)Safety – Safety deals with the possible damage that can happen to the operating person and environment due to the breakdown of an embedded system or due to the emission of hazardous materials from the embedded products. – A safety analysis is a must in product engineering to evaluate the anticipated damage and determine the best course of action to bring down the consequence of damages to an acceptable level. 5/15/20204 SEM - 18CS44 - Microcontrollers & Embedded Systems
- 9. 2.Non-Operational Quality Attributes. – These are attributes not related to operation or functioning of an embedded system. The way an embedded system operates affects its overall quality. – These are the attributes that are associated with the embedded system before it can be put in operation. a)Testability and Debug-ability – It deals with how easily one can test his/her design, application and by which mean he/she can test it. – In hardware testing the peripherals and total hardware function in designed manner – Firmware testing is functioning in expected way – Debug-ability is means of debugging the product as such for figuring out the probable sources that create unexpected behavior in the total system 5/15/20204 SEM - 18CS44 - Microcontrollers & Embedded Systems
- 10. b)Evolvability – For embedded system, the qualitative attribute “Evolvability” refer to ease with which the embedded product can be modified to take advantage of new firmware or hardware technology. c)Portability – Portability is measured of “system Independence”. – An embedded product can be called portable if it is capable of performing its operation as it is intended to do in various environments irrespective of different processor and or controller and embedded operating systems. 5/15/20204 SEM - 18CS44 - Microcontrollers & Embedded Systems
- 11. d)Time to prototype and market – Time to Market is the time elapsed between the conceptualization of a product and time at which the product is ready for selling or use – Product prototyping help in reducing time to market. – Prototyping is an informal kind of rapid product development in which important feature of the under consider are develop. 5/15/20204 SEM - 18CS44 - Microcontrollers & Embedded Systems
- 12. e) Per unit and total cost – Cost is an important factor which needs to be carefully monitored. Proper market study and cost benefit analysis should be carried out before taking decision on the per unit cost of the embedded product. – When the product is introduced in the market, for the initial period the sales and revenue will be low – There won’t be much competition when the product sales and revenue increase. – During the maturing phase, the growth will be steady, and revenue reaches highest point and at retirement time there will be a drop in sales volume. 5/15/20204 SEM - 18CS44 - Microcontrollers & Embedded Systems