A computer-aided design (CAD) tool is used to create a preliminary design of a mulit-layered printed circuit board, comprising a layout of electrical components on a main region of a printed circuit board and a routing of signal traces among the lectical components within the main region. An extended...http://www.google.com.au/patents/US6787708?utm_source=gb-gplus-sharePatent US6787708 - Printed circuit board debug technique
