发明授权
- 专利标题: Memory card conforming to a multiple operation standards
- 专利标题(中): 存储卡符合多种操作标准
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申请号: US10811898申请日: 2004-03-30
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公开(公告)号: US07370168B2公开(公告)日: 2008-05-06
- 发明人: Motoki Kanamori , Kunihiro Katayama , Yasuhiro Nakamura , Satoshi Yoshida , Shinsuke Asari
- 申请人: Motoki Kanamori , Kunihiro Katayama , Yasuhiro Nakamura , Satoshi Yoshida , Shinsuke Asari
- 申请人地址: JP Tokyo
- 专利权人: Renesas Technology Corp.
- 当前专利权人: Renesas Technology Corp.
- 当前专利权人地址: JP Tokyo
- 代理机构: Miles & Stockbridge P.C.
- 优先权: JP2003-121388 20030425
- 主分类号: G06F12/00
- IPC分类号: G06F12/00
摘要:
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.
公开/授权文献
- US20040215996A1 Memory card 公开/授权日:2004-10-28