Smart Card Memory Data Erasure Current Spike Mitigation
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Solution Overview
Problem
Large-capacity smart cards experience excessive current spikes during data erasing and writing operations, leading to abnormal device behavior and reduced battery life in mobile devices due to the high current requirements of their device-card interfaces.
Innovation Solution
A method where the smart card's CPU buffers data and enters a standby and sleep mode after transmitting a data erasing and writing signal to the memory, allowing the memory to perform the operation independently, thus reducing the current draw during these processes and preventing over-current issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data erasing and writing operations are performed on large-capacity memory in the smart card, then storage capacity and data processing capability are improved, but current consumption of the device-card interface increases beyond acceptable limits
Solution Approach 1:
The CPU prepares and buffers data in advance before initiating the erasing and writing operation on the large-capacity memory. This preliminary data preparation allows the memory operation to proceed independently once started, reducing the duration and intensity of high current draw from the device-card interface.
Solution Approach 2:
The large-capacity memory performs the data erasing and writing operation autonomously after receiving the initial command signal from the CPU. The memory independently manages the data processing without requiring continuous CPU intervention, thereby minimizing the overall current consumption during the operation.
2Productivity
If data erasing and writing operations are performed on large-capacity memory, then data processing capability is improved, but device stability deteriorates due to abnormal device behavior caused by excessive current
Solution Approach 1:
The CPU buffers data and prepares the operation parameters before triggering the memory operation. This preliminary preparation ensures that the memory receives complete and valid data before starting the erasing and writing process, preventing operation failures that could cause device instability.
Solution Approach 2:
The memory independently executes the data erasing and writing operation without requiring continuous CPU control signals. This autonomous operation reduces the duration of high current draw and minimizes the risk of device-card interface abnormalities, thereby improving device stability.
3Quantity of substance
If data erasing and writing operations are performed on large-capacity memory, then storage functionality is improved, but battery life is reduced due to increased power consumption
Solution Approach 1:
The CPU prepares data in a buffer memory before initiating the memory operation. This preliminary preparation allows the subsequent memory erasing and writing operation to proceed efficiently with minimal CPU involvement, reducing overall power consumption during the data storage process.
Solution Approach 2:
The large-capacity memory autonomously performs the data erasing and writing operation after receiving the initial command, without requiring continuous power supply to the CPU. This self-service operation minimizes the duration of high power consumption, thereby extending battery life.
Data Source
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AI summary
The invention relates to a data erasable method of memory in smart cards and smart cards thereof, which includes: when a CPU in the smart card determines a data erasable operation will be proceed in the specified memory of the smart card, cache the data to be written in a random memory cache of the specified memory; after sending a data erasable signal to the specified memory, control itself to enter a standby sleep mode. The data erasable signal is used to indicate the specified memory to process the data erasable operation by obtaining the data to be written from the random memory cache. Using the provided solution, the current of the machine card interface can be reduced when a data erasable is proceed in the specified memory of the smart card, thus abnormal conditions due to the high current of the machine card interface are avoided, and the power consumption is reduced at the same time, the standby time of the device which the smart card is in is improved.