Static information storage and retrieval – Read only systems
Patent
1999-10-20
2000-12-26
Nguyen, Tan T.
Static information storage and retrieval
Read only systems
365104, G11C 1700
Patent
active
061669431
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.
REFERENCES:
patent: 4569120 (1986-02-01), Stacy et al.
patent: 4590589 (1986-05-01), Gezberg
patent: 5060190 (1991-10-01), Chen et al.
patent: 5557137 (1996-09-01), Cohen
Chang Jui-Chin
Lin Chun-Jung
Wang Mam-Tsung
Wang Ping-Ying
Yang Chun-Yi
Hsu Winston
Macronix International Co, Ltd
Nguyen Tan T.
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