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US006170049B1
(12) United States Patent ao) Patent No.: us 6,170,049 Bi
So (45) Date of Patent: Jan. 2,2001
(54) PC CIRCUITS, SYSTEMS AND METHODS (75) Inventor: John Ling Wing So, Piano, TX (US)
(73) Assignee: Texas Instruments Incorporated,
Dallas, TX (US)
( * ) Notice: Under 35 U.S.C. 154(b), the term of this patent shall be extended for 0 days.
(21) Appl. No.: 09/372,744
(22) Filed: Aug. 11, 1999
Related U.S. Application Data
(62) Division of application No. 08/823,257, filed on Mar. 24,
1997, now Pat. No. 5,987,590 (60) Provisional application No. 60/014,734, filed on Apr. 2,
1996.
(51) Int. CI.7 G06F 9/44; G06F 12/02
(52) U.S. CI 712/35; 712/36; 712/31;
711/130
(58) Field of Search 712/35, 200.31,
712/36, 242, 227, 243, 208; 710/129; 704/254;
711/130
