Memory Module Metadata Mapping Without Extra Chip Area
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Solution Overview
Problem
Existing memory devices face inefficiencies in handling metadata, leading to increased chip size, power consumption, and reduced bus efficiency due to separate memory cells or different read times for normal data and metadata.
Innovation Solution
A memory device with a bank array divided into regions for normal data and metadata, allowing simultaneous read/write operations and flexible column address mapping, enabling efficient metadata handling without increasing chip size or power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If separate memory cells are used for normal data and metadata, then metadata can be stored, but chip size increases
Solution Approach 1:
The patent makes the second region serve multiple functions: it stores metadata when the memory device operates in first mode, and stores normal data when operating in second mode. This multi-functionality allows metadata storage capability without permanently allocating dedicated memory cells, thereby avoiding permanent chip size increase for metadata storage.
Solution Approach 2:
The patent implements dynamic mode switching between first mode and second mode, where the function of the second region changes based on operational requirements. This dynamic reconfiguration allows the same hardware resources to adapt between storing metadata or normal data, eliminating the need for separate dedicated memory cells for metadata.
2Loss of information
If separate memory cells are used for normal data and metadata, then metadata can be stored, but power consumption increases
Solution Approach 1:
The second region serves dual purposes as metadata storage or normal data storage depending on mode, meaning the same physical memory cells handle both functions. This eliminates the need for separate dedicated metadata memory cells that would consume additional power, as the existing memory infrastructure is reused for metadata operations.
3Loss of information
If different read times are used for normal data and metadata, then metadata can be handled, but bus efficiency decreases
Solution Approach 1:
The patent merges the handling of normal data and metadata into unified read/write operations. When the memory device operates in first mode, both normal data from the first region and metadata from the second region can be accessed simultaneously through the same data bus using the same column addresses, eliminating separate metadata access operations and maintaining bus efficiency.
4Loss of information
If the second region stores metadata, then metadata provision is enabled, but column address mapping complexity increases
Solution Approach 1:
The second region is designed to respond to column addresses in the same manner as the first region, using the same number of column addresses for both normal data and metadata. This uniform addressing scheme simplifies the column decoder design and address mapping logic, as the same address lines and decoding circuitry can access both regions without requiring complex address translation or mapping mechanisms.
Data Source
AI summary
Disclosed is a memory device which includes a bank array including a plurality of memory cells, a row decoder connected to the bank array through a plurality of word lines, and a column decoder connected to the bank array through a plurality of column selection lines. The bank array includes a first region and a second region different from the first region. The memory device is configured to operate in a first mode, in which the first region stores normal data and the second region stores metadata based on a first number of column addresses, respectively. The memory device is configured to operate in a second mode, in which the first region and the second region store normal data based on a second number of column addresses. The second number is greater than the first number.