Secure multimedia card and memory card system
AssigneeSamsung Electronics Co., Ltd.
InventorsWon-Moon CHEON, Chan-Ik PARK, Moon-Sang KWON
Life of this patent
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Abstract
Provided are a secure multimedia card (secure MMC) and a memory card system having the same. The memory card system may include a host, and a secure MMC having a user data area accessed by a normal command and a restricted area accessed by a secure command, wherein the user data area in communication with the host stores user data and the restricted area stores access restriction data. The restricted area may be accessed in the secure MMC even though the interface unit in the host does not support commands requesting the access to the restricted area in the secure MMC.
Claims30
A secure multimedia card (MMC) comprising:
- a memory including a first area to be accessed by a first type of command, and a second area to be accessed by a second type of command;
- and
- a controller to access the memory in response to a command and an argument input to the MMC;
- wherein the controller converts the input command to the second type of command when the input command is the first type of command for accessing the first area and the argument has a predetermined value.
A secure MMC comprising:
- a memory including a user data area to be accessed by a normal command, and a restricted area to be accessed by a secure command;
- and
- a controller to access the memory in response to a command and an argument input to the MMC;
- wherein the controller converts the input command to the secure command when the input command is a normal command code, the argument has a predetermined value, and data input to the MMC has a predetermined pattern.
A memory card system comprising:
- a host;
- and
- a secure MMC including a first area to be accessed by a first type of command, and a second area to be accessed by a second type of command;
- wherein the host outputs the first type of command and an argument with a predetermined value to access the second area of the secure MMC, and the secure MMC recognizes the first type of command as the second type of command when the argument input with the first command has the predetermined value.
A method of operating a memory card system including a secure MMC having a user data area and a restricted data area, the method comprising:
- generating a first command for accessing the user data area when access to the restricted data area is requested, wherein the first command includes access information of the restricted data area;
- determining whether the first command includes the access information of the restricted data area;
- converting the first command to a second command for accessing the restricted data area when the first command includes the access information of the restricted data area;
- and
- accessing the restricted data area in response to the converted second command.
A host comprising:
- a controller to execute an application program;
- and
- an interface unit coupled to the controller to interface the host system to a secure MMC that operates in response to normal commands and secure commands;
- wherein the host system includes logic to convert a secure command to a normal command.
A secure MMC comprising:
- a memory including a user data area to be accessed by normal commands, and a restricted area to be accessed by secure commands;
- and
- a controller to interpret a normal command as a secure command when the normal command is accompanied by an argument having a secure command parameter.
Dependencies are inferred from the claim text.