The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 26, 2000
Filed:
Oct. 20, 1999
Ping-Ying Wang, Hsin-Chu, TW;
Chun-Yi Yang, Hsin-Chu Hsien, TW;
Chun-Jung Lin, Hsin-Chu, TW;
Jui-Chin Chang, Tai-Chung Hsien, TW;
Mam-Tsung Wang, Hsin-Chu, TW;
Macronix International Co, Ltd, Hsin-Chu, TW;
Abstract
The present invention provides a method of writing a set of binary codes into a ROM. The method is performed by forming a first photo mask and a second photo mask according to an original first code pattern, an original second code pattern, and a set of binary codes to be written into the ROM. Final first and second code patterns are formed by coupling the binary codes to be written with the original first and second code patterns by using a Boolean logical OR operation. The first and second photo masks are formed according to the final first and second code patterns. The first photolithographic process is performed using the first photo mask, and the first ion implantation process is performed; the second photolithographic process is performed using the second photo mask, and the second ion implantation process is performed. Thus the set of binary codes is written into the ROM completely and correctly.