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:
Nov. 28, 2006
Filed:
Oct. 06, 2004
Ing-jer Huang, Kaohsiung, TW;
Yu-wen Sung, Kaohsiung, TW;
Ing-Jer Huang, Kaohsiung, TW;
Yu-Wen Sung, Kaohsiung, TW;
National Sun Yat-Sen University, Taiwan, CN;
Abstract
The invention relates to an automatic register backup/restore system. The system comprises: a general register file, a backup register file, at least one backup mode signal and at least one selector for selecting the general register file. The general register file comprises a plurality of general registers, and the backup register file comprises a plurality of backup registers. According to the system of the invention, upon exception, a backup mode is determined according to the cause of the exception. Then, according to the determined backup mode, the contents of at least one general register are automatically copied into at least one backup register. Upon leaving the exception process, according to the determined backup mode, the contents of the corresponding general registers are restored from the corresponding backup registers by using at least one selector. Therefore, the system of the invention can reduce the data moving activities between memory and registers during exception process. Because of the single operation mode of the system, the system does not need any selection-mode bit for selecting accessible registers due to different operation modes as used in the prior art. Therefore, the system of the invention can decrease the latency of accessing registers.