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. 13, 2007
Filed:
Mar. 20, 2003
Motoki Kanamori, Yokkaichi, JP;
Shigeo Kurakata, Tokorozawa, JP;
Chiaki Kumahara, Kodaira, JP;
Hidefumi Odate, Kodaira, JP;
Atsushi Shikata, Higashiyamato, JP;
Motoki Kanamori, Yokkaichi, JP;
Shigeo Kurakata, Tokorozawa, JP;
Chiaki Kumahara, Kodaira, JP;
Hidefumi Odate, Kodaira, JP;
Atsushi Shikata, Higashiyamato, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
Whether an initial command outputted from a host is 'CMDor 'CMDCMDis detected with an initial command detection portion, and the result of detection is set in an SD/MMC register. Reset process for hardware and that for firmware are carried out based on the result of detection set in the SD/MMC register. Thereafter, a microcomputersets data indicating in which mode, MultiMedia Card mode or SD mode, the firmware reset process was carried out, in a F/W process SD/MMC register. A H/W-F/W mode comparison circuitcompares data in the SD/MMC registerwith data in the F/W process SD/MMC register. If these data agree with each other, busy state is released, and command wait state is established. If they disagree with each other, a disagreement occurrence detection signal is outputted to the microcomputer, and power-on reset processing is performed again.