NAND Flash Boot Sequence Auto-Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for accessing software and codes from NAND flash memory during the boot procedure are costly and inflexible, as they often require additional memory types or redesigns, especially when switching between different NAND flash memory capacities.
Innovation Solution
An automatic detection procedure for identifying the read command sequence applicable to any type of NAND flash memory, using an auxiliary memory to store a code that determines the correct read command sequence and data bus width, allowing for flexible and cost-effective access without manual software modifications or hardware redesigns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NOR flash memory is used for boot procedure to access NAND flash memory, then the controller can access software and codes, but the cost increases and software updates are required when changing memory capacity
Solution Approach 1:
The controller automatically detects the read command sequence type by testing different command sequences (00-30, 00-33, 00-39, 00-3B) and identifying which one generates an acknowledgment signal from the NAND flash memory. This self-detection mechanism eliminates the need for manual configuration or software updates when changing memory capacity, allowing the system to adapt automatically.
Solution Approach 2:
The invention changes the parameter being detected from memory capacity to command sequence type. By detecting which read command sequence (differentiated by the second byte: 30, 33, 39, or 3B) the NAND flash memory responds to, the system indirectly determines the appropriate access mode without needing to know the exact memory capacity or type beforehand.
2Reliability
If OneNand flash memory is used to integrate NAND, SRAM and logic chip, then boot procedure can be implemented, but the cost increases and hardware redesign is required when replacing memory type
Solution Approach 1:
The invention extracts the automatic detection function from complex integrated solutions like OneNand and implements it using only the existing controller and NAND flash memory components. By taking out the detection logic and implementing it as a standalone automatic testing mechanism, the system avoids the need for additional SRAM chips or complex integrated memory solutions.
3Reliability
If manual software modification is performed to update read command sequence when changing NAND flash memory capacity, then correct access is achieved, but time and cost are consumed
Solution Approach 1:
The invention performs preliminary automatic detection of the read command sequence type during the boot procedure before any software execution or memory access operations. By detecting the command sequence type (00-30, 00-33, 00-39, or 00-3B) in advance, the system prepares the correct access mode beforehand, eliminating the need for subsequent software updates or manual modifications.
Data Source
AI summary
An electronic device including a NAND flash memory, an auxiliary memory, and a controller is provided. A code for detecting a read command sequence of the NAND flash memory is stored in the auxiliary memory. During a boot procedure of the electronic device, the controller reads the code from the auxiliary memory and executes the code to obtain the read command sequence of the NAND flash memory, so as to access content stored in the NAND flash memory according to the read command sequence.