The architectural description tells us what additives we need. 
The element layout attempt builds the ones element in conformance to the structure and specification. 
The element will in standard encompass each hardware and software program modules. 
Some of the element may be ready-made ( example - cpu reminiscence chips) 
SYSTEM INTEGRATION: 
After the element are constructed they're intergrated 
Bugs are generally observed at some stage in gadget integration 
Good making plans can assist us discover the insects fast 
By debugging few modules at a time easy insects may be exposed 
By solving the easy insects early greater complicated or difficult to understand insects may be exposed. 
System intergration is diffcult as it commonly unconvers problems. 
The debugging centers for embedded structures are commonly a good deal greater constrained than computer structures. 
Careful interest to placing suitable debugging centers at some stage in layout can assist ease gadget integration problems. A specification could encompass numerous additives. 
Data acquired from the GPS satellite.Map information, person interface. 
Operation that should be perfomed to fulfill patron requests. 
Background actions. A simple block diagram on GPS gadget to reveal principal operation and information flows amongst them. 
Architecture layout: 
The specification describes simplest the features of the gadget. 
Implemention of the gadget is defined with the aid of using the structure. 
The structure is a plan for the general shape of the sysytem. 
It may be used later to layout the components.

The architecture will be illustrated using block diagrams.

SPECIFICATION:-

Requirement acquire and refines the records 
Spefification serves because the settlement among the consumer and the architects. 
It is important to developing running structures with at the very least clothier effort. 
It need to be specific, comprehensible and correctly displays the clients necessities. 
Requirements:- 
Two phases:- 
Gather an casual description from the clients called necessities. 
Refine the requirement right into a specification to start desiging the machine architecture. 
Requirement is split into  elements useful and non-functionals. 
What are all of the feature we want and the machine has to do referred to as useful necessities non-useful means. 
Performed -pace 
Cost- Manufacturing and non ordinary engineering costs. Physical length and weight - relying at the application. 
Power consumption- battery life. 
TOP- DOWN APPROACH: 
Begin with the maximum summary description of the machine and condude with concrete details. 
BOTTOM-UP APPROACH: 
Start with element to construct a machine bottom-up layout steps are display withinside the parent as dashed line arrows. 
A layout methodogy is critical for following motives 
1.layout to make sure that we've got finished the entirety we want to do. 
2. Develop laptop aided layout tools. 
3.makes it a whole lot less difficult for contributors of a layout group to communicate.