Non-Volatile Memory Segmented Read for Replay-Protected Monotonic Count
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Solution Overview
Problem
Current replay-protected monotonic counter (RPMC) technologies require extensive read operations across multiple memory cells, making it time-consuming to learn the replay-protected monotonic count value, especially as the number of programmed memory cells increases.
Innovation Solution
A memory device and operating method that organizes memory cells into segments and performs programming and read operations in a segmented and ordered manner, allowing for efficient calculation of the replay-protected monotonic count value by identifying the last programmed cell, thereby reducing the number of read operations required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RPMC performs programming operations on multiple memory cells one by one according to each increment command, then the replay-protected monotonic count value can be updated, but the number of read operations increases substantially proportional to the number of memory cells programmed, making it time-consuming to learn the count value
Solution Approach 1:
The memory device is divided into multiple segments, each containing multiple memory cells. The controller performs programming operations on memory cells across different segments in parallel rather than sequentially. When a read command is received, the controller reads memory cells from segments in parallel to determine the replay-protected monotonic count value, significantly reducing the time required compared to reading cells one by one.
2Measurement precision
If more memory cells are programmed due to increment command, then the replay-protected monotonic count value is updated accurately, but more read operations are required which takes longer time
Solution Approach 1:
The controller pre-establishes a mapping relationship between memory cell addresses and their corresponding segment assignments. When programming operations are performed, the controller uses this pre-established mapping to efficiently determine which segments contain programmed cells. During read operations, the controller leverages this pre-organized structure to quickly identify and read only the necessary memory cells, avoiding unnecessary read operations and maintaining both precision and speed.
Data Source
AI summary
A memory device and an operating method for controlling a non-volatile memory are provided. The non-volatile memory includes segments. Each of the segments includes memory cells. The operating method includes the following steps. A programming operation is performed multiple times on the memory cells in sequence according to increment commands, a segment order, and a memory cell order. When receiving a read command, a read operation is performed multiple times on the memory cells according to the segment order and the memory cell order until a last programmed memory cell is learned. According to an address of the last programmed memory cell, a replay-protected monotonic count value associated with a number of the increment commands is calculated.