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:
May. 06, 2008
Filed:
Mar. 30, 2004
Motoki Kanamori, Tachikawa, JP;
Kunihiro Katayama, Chigasaki, JP;
Yasuhiro Nakamura, Tachikawa, JP;
Satoshi Yoshida, Tachikawa, JP;
Shinsuke Asari, Akishima, JP;
Motoki Kanamori, Tachikawa, JP;
Kunihiro Katayama, Chigasaki, JP;
Yasuhiro Nakamura, Tachikawa, JP;
Satoshi Yoshida, Tachikawa, JP;
Shinsuke Asari, Akishima, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
The invention intends to provide a memory card conforming to an HS-MMC mode in a standard of a multimedia card, while securing compatibility of both standards of the multimedia card and an SD card. In a normal MMC mode, the data is outputted at a fall edge of a clock signal. A frequency of the clock signal is about 20 MHz. When the data is outputted at the fall edge of the clock signal, data output is in time for a next clock signal. When a parameter '1' is set to a timing register provided in a host interface, the memory card is transitioned into the HS-MMC mode. In the HS-MMC mode, a clock signal frequency is increased to about 52 MHz. Here, the data is outputted at the rise edge of the clock signal, whereby the data output is brought in time for the rise edge of the next clock signal.