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:
Apr. 19, 2005
Filed:
May. 31, 2002
Takeo Sasaki, Kawasaki, JP;
Koichi Kuroiwa, Kawasaki, JP;
Shoji Taniguchi, Kawasaki, JP;
Takanobu Kashiwagi, Hyogo, JP;
Takeo Sasaki, Kawasaki, JP;
Koichi Kuroiwa, Kawasaki, JP;
Shoji Taniguchi, Kawasaki, JP;
Takanobu Kashiwagi, Hyogo, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A processor and method of booting the processor in which dispensable circuit operation is eliminated to reduce power consumption. A first expected check-sum value relating to instructions and table data and a second expected check-sum value relating only to instructions are held in a boot ROM. When power is turned on, if a power-on determination circuit determines that the power has been turned on for a system, a read selection circuit loads instructions and the table data into an instruction storage memory and a table data storage memory and a check-sum performing circuit performs check-sum using the first expected check-sum value. In the case where the power has been turned on for periodic operation, instructions are loaded into the instruction storage memory, check-sum is performed using the second expected check-sum value, and table data that was saved in a backup memory is loaded into the table data storage memory. Thus, the time required for loading from the boot ROM for the periodic operation decreases.