Patent ID: 9506986
Filing Date: 2016-11-29
CPC Classification: G01R

Claim Text:
1. A chip comprising at least two integrated circuits, at least three scan chains, and a multiplexor circuitry, each integrated circuit comprising an input port and an output port, the scan chains and the integrated circuits are coupled in a series chain with the integrated circuits and the scan chains alternating each other, the series chain beginning with an initial scan chain and ending with an end scan chain, wherein each scan chain comprises a first scan chain input port and a first scan chain output port, the first scan chain input port of each scan chain, except the initial scan chain, is coupled with the output port of a preceding integrated circuit in the series chain, the first scan chain output port of each scan chain, except the end scan chain, is coupled with the input port of a successive integrated circuit in the series chain, the multiplexor circuitry comprising: using a computer, bypassing a first portion of the series chain beginning with a first bypassed scan chain and ending with a last bypassed integrated circuit wherein the output port of the integrated circuit preceding the first bypassed scan chain is coupled with the first scan chain input port of the scan chain succeeding the last bypassed integrated circuit and the first scan chain input port of the scan chain succeeding the last bypassed integrated circuit is decoupled from the output port of the last bypassed integrated circuit; and bypassing a second portion of the series chain beginning with a first bypassed integrated circuit and ending with a last bypassed scan chain wherein the input port of the integrated circuit adjacent to the last bypassed scan chain is coupled with the first scan chain output port of the scan chain adjacent to the first bypassed integrated circuit and the input port of the integrated circuit adjacent to the last bypassed scan chain is decoupled from the first scan chain output port of the last bypassed scan chain.