Computers as Components, 2nd Edition

1.2 The Embedded System Design Process 17

Name GPS moving map

Purpose Consumer-grade moving map for driving use

Inputs Power button, two control buttons

Outputs Back-lit LCD display 400 ⫻ 600

Functions Uses 5-receiver GPS system; three user-selectable resolu-

tions; always displays current latitude and longitude

Performance Updates screen within 0.25 seconds upon movement

Manufacturing cost $30

Power 100 mW

Physical size and weight No more than 2” ⫻ 6, ” 12 ounces

This chart adds some requirements in engineering terms that will be of use to the designers.

For example, it provides actual dimensions of the device. The manufacturing cost was derived

from