Metadata Location Decoder Circuit for Memory Read Operations
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Solution Overview
Problem
Existing semiconductor memory devices face challenges in rapidly and efficiently locating metadata associated with read operations, particularly in scenarios where consecutive accesses to different column select values occur, requiring extensive circuitry and complex operations.
Innovation Solution
The implementation of a metadata location decoder circuit that subtracts a minimum value of the range of column select values from the current column select signal to generate a metadata location, allowing for quick identification of the relevant metadata set within a stored block during read operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional metadata location methods are used during read operations, then metadata can be stored in the array, but locating the relevant metadata becomes slow and complex requiring extensive circuitry
Solution Approach 1:
The column address is segmented into two parts: a first portion used to generate a row address for reading metadata from a separate storage array, and a second portion used as a direct index into local metadata latches. This segmentation allows the system to use different storage strategies for different metadata types, improving both speed and reducing complexity compared to a unified approach.
Solution Approach 2:
Metadata is pre-fetched and stored in latches before the actual data read operation occurs. The metadata location decoder circuit prepares the metadata index by subtracting the minimum column select value from the current column select signal, so that when data is ready to be read, the corresponding metadata is already positioned and ready for immediate output, eliminating delays during the critical data path.
2Loss of information
If metadata is stored in the array with data, then additional information is available, but rapidly locating specific metadata within large blocks becomes difficult
Solution Approach 1:
A metadata location decoder circuit is introduced as an intermediary component that translates the column select signal into a metadata-specific address or index. This decoder uses the relationship between data addresses and metadata addresses to automatically generate the correct metadata location, making metadata easily accessible without requiring complex search operations through the data array.
Solution Approach 2:
The patent separates metadata storage from data storage by introducing a distinct metadata storage array and latch structure. Instead of mixing metadata within the data array, the system creates a separate dimensional space for metadata, accessible through a different addressing mechanism. This dimensional separation allows independent optimization of data and metadata access paths.
3Measurement precision
If extensive circuitry is used to locate metadata, then accurate metadata identification is achieved, but power consumption increases
Solution Approach 1:
The metadata location function is extracted from the main data path and implemented as a separate, dedicated metadata location decoder circuit. This extraction allows the metadata decoding logic to be optimized independently, using simpler and more power-efficient circuitry tailored specifically for metadata addressing, rather than requiring the full complexity of a general-purpose address decoder.
Data Source
AI summary
A memory device stored data and associated metadata. During a read operation, memory receives a column address and decodes it into a column select value. Based on a range of values which contain that column select value, a block of metadata which includes the associated metadata is read. The memory subtracts a minimum value of the range of values from the column select value to determine a metadata location value. The metadata location value indicates a relative position of the associated metadata within the block of metadata, and the data and associated metadata are read out.