Interface Control Document

The Interface Control Document (ICD) is a document that lists all data and their types

that are passed among the subsystems or between a subsystem and an outside system.

The purpose of this document is to have the interfaces well defined so that sub-systems

can be coded in parallel by different software engineers.

Example: ICD for the Microwave sub-systems.

Data between Input Subsystem and MicroWaveHeat subsystem:

Name Type Value Range Default Value

Power_Level Integer 0 10 5

Data between Input Subsystem and Timer subsystem:

Name Type Value Range Default Value

Timer_Value Unsigned long int 0 9999 0

Data between Input Subsystem and TurnTable subsystem:

Name Type Value Range Default Value

On Boolean True

False

False

Data between Timer Subsystem and Display subsystem:

Name Type Value Range Default Value

Count_Value String 0 9999 or

Food is Ready

0