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A memory unit such as a memory card is removably attachable to a data processing unit such as a digital video recorder or an audio recording/reproducing unit. The memory unit includes a non-volatile memory, a security unit for protecting the security of data stored in the non-volatile memory, and an

A memory unit such as a memory card is removably attachable to a data processing unit such as a digital video recorder or an audio recording/reproducing unit. The memory unit includes a non-volatile memory, a security unit for protecting the security of data stored in the non-volatile memory, and an interface that receives control data from the data processing unit. The control data is either first control data for a read or write operation with respect to the non-volatile memory, or second control data (different from the first control data) for a security operation of the security unit. Thus, a security-type memory card is compatible with both a security type and a non-security type data processing unit.

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A memory unit such as a memory card is removably attachable to a data processing unit such as a digital video recorder or an audio recording/reproducing unit. The memory unit includes a non-volatile memory, a security unit for protecting the security of data stored in the non-volatile memory, and an

A memory unit such as a memory card is removably attachable to a data processing unit such as a digital video recorder or an audio recording/reproducing unit. The memory unit includes a non-volatile memory, a security unit for protecting the security of data stored in the non-volatile memory, and an interface that receives control data from the data processing unit. The control data is either first control data for a read or write operation with respect to the non-volatile memory, or second control data (different from the first control data) for a security operation of the security unit. Thus, a security-type memory card is compatible with both a security type and a non-security type data processing unit. system comprising: a primary channel for communicating said system data from said first memory device; an identification channel for communicating said identification data from said definition device; a programming channel for providing programming access to said first memory device and said definition device; the programming channel further comprising one or more dual function sub-channel lines configured to communicate a programming signal to said first memory device when said directly coupled memory bus operates in a programming mode and to communicate a data transfer signal to said first memory device when said directly coupled memory bus operates in a data transfer mode. 6. The reconfigurable memory of claim 5, wherein said on-card system memory further comprises a memory extension device for providing an increased on-card memory capacity, and said single memory bus further comprises an expansion channel for providing data and programming access to said memory extension device.