Patent ID: 6161053
Filing Date: 2000-12-12
Classification: H01L

Abstract:
A method for testing the code content in binary code devices, such as ROMs, during wafer fabrication processing to determine coding errors, comprising the steps of:providing a wafer for processing and during said processing, forming an array of binary code devices thereon including scribe-lines built-in the binary code devices;applying code in the binary code devices during processing to provide the code content therein in the form of a binary signal in each binary code device convertible to a decimal number indicative of a ROM code id;applying a Process Control Machine (PCM) used in the fabrication processing on the scribe-lines built-in the binary code devices;sensing the binary signal in each binary code device and using the PCM testing program to convert it to a decimal number to identify the ROM code id; andfinishing wafer processing and PCM testing, and reading the ROM code id that has been fabricated into the binary code devices during processing from the PCM testing report.