公开(公告)号：US20040156242A1

公开(公告)日：2004-08-12

申请号：US10716504

申请日：2003-11-20

Applicant: Renesas Technology Corp.

Inventor： Tetsuya Iida ,  Motoki Kanamori ,  Atsushi Shikata ,  Takayuki Tamura ,  Kunihiro Katayama

IPC: G11C016/04

CPC classification number: G06K19/07732 ,  G06K19/07

Abstract: There is provided a technology to realize high speed data transfer while compatibility of a card type storage device comprising a nonvolatile memory is ensured. Namely, in the card type storage device comprising the nonvolatile memory, a plurality of data terminals are provided and an interface unit is provided with a circuit for determining levels of data terminals. Some or all of the plurality of data terminals are connected with pull-up resistors for pulling up to a power source voltage. When the determination circuit determines that the data terminals connected with the pull-up resistors are in an open condition, the determination circuit switches a bus width (number of bits) of data.

Abstract translation: 提供了一种实现高速数据传输的技术，同时确保包括非易失性存储器的卡式存储装置的兼容性。 也就是说，在包括非易失性存储器的卡型存储装置中，提供多个数据终端，并且接口单元设置有用于确定数据终端电平的电路。 多个数据端子中的一些或全部与上拉电阻相连以提升电源电压。 当确定电路确定与上拉电阻器连接的数据端子处于打开状态时，确定电路切换数据的总线宽度（位数）。

公开(公告)号：US20040117553A1

公开(公告)日：2004-06-17

申请号：US10716456

申请日：2003-11-20

Applicant: Renesas Technology Corp. ,  Hitachi ULSI Systems Co., Ltd.

Inventor： Shigeo Kurakata ,  Kunihiro Katayama ,  Motoki Kanamori ,  Atsushi Shikata ,  Tetsuya Iida

IPC: G06F012/00

CPC classification number: G06K19/0701 ,  G06K19/07

Abstract: A memory card is provided in which power consumption is reduced by the pull-up resistor of an input terminal and a misoperation induced by the pull-down resistor of a host apparatus is prevented. The memory card has a select terminal connected to the pull-up resistor. When the mode of the memory card is determined based on an input from the select terminal, a relatively low resistance value is selected for the pull-up resistor of the select terminal before a determination timing and the pull-up resistor is restored to an initial resistance value after the mode determination. A relatively high resistance value reduces a leakage current consumed by the pull-up resistor of the select terminal. When a pull-down resistor is connected to the terminal of a memory card host to which the memory card is attached, if the resistance value of the pull-up resistor is excessively high, it is influenced by the drawing in of a current by the pull-down resistor. If the resistance value of the pull-up resistor of the select terminal is lowered at the time of mode determination, an adverse effect of the lowering of a potential by the pull-down resistor can be circumvented.

Abstract translation: 提供了一种存储卡，其中通过输入端的上拉电阻降低功耗，并且防止由主机设备的下拉电阻引起的误操作。 存储卡具有连接到上拉电阻的选择端子。 当基于来自选择端子的输入确定存储卡的模式时，在确定定时之前为选择端的上拉电阻选择相对较低的电阻值，并且将上拉电阻恢复到初始值 模式确定后的电阻值。 相对较高的电阻值减小了选择端子的上拉电阻消耗的漏电流。 当下拉电阻连接到与存储卡相连的存储卡主机的端子时，如果上拉电阻的电阻值过高，则会受到电流的影响 下拉电阻。 如果选择端子的上拉电阻的电阻值在模式确定时降低，则可以避免下拉电阻降低电位的不利影响。