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:
Jul. 22, 2008
Filed:
May. 05, 2004
Yuki Kondoh, Kokubunji, JP;
Yuki Kondoh, Kokubunji, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
A device with a small number of circuits is provided for blocking illegal address access from a bus master device connected to the processor system bus. An illegal address blocking circuit is inserted into the address line and control lines between the bus master device and the bus or the bus control circuit, according to the system bus configuration. A register is installed within the illegal address access blocking device to set an address range where access is allowed. The address output from the address line is then checked by a comparator to find if it is within the allowable range or not, and if it is outside the allowable range, then that illegal access is prevented by blocking the output on the control line.