Memory Controller Variable Address Mapping Tables
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Solution Overview
Problem
Existing memory controller systems do not effectively address the performance characteristics of host devices accessing memory devices, leading to suboptimal performance in terms of latency, bandwidth, and power consumption due to fixed address mapping methods that do not consider the access patterns of host devices.
Innovation Solution
A memory controller system that utilizes a plurality of address mapping tables to dynamically map logical addresses from host devices to physical addresses based on the access patterns and performance characteristics of each host device, employing both variable and fixed address mapping tables to optimize address translation and improve system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed address mapping table is used, then the device complexity is reduced, but the productivity and performance characteristics (latency, bandwidth, power consumption) deteriorate due to inability to adapt to different host device access patterns
Solution Approach 1:
The patent implements dynamic address mapping by maintaining multiple address mapping tables (first, second, third, and fourth mapping tables) and selectively switching between them based on the access patterns of different host devices. The memory controller dynamically selects which mapping table to use for each host device, allowing the system to adapt to varying access patterns such as sequential, random, or interleaved accesses, thereby improving latency, bandwidth, and power consumption characteristics without requiring a single complex reconfigurable structure.
Solution Approach 2:
The patent applies different address mapping strategies to different host devices based on their specific access patterns. Each host device can be assigned a specific mapping table that is optimized for its access characteristics, allowing localized optimization rather than a one-size-fits-all approach. This enables the system to tailor the address mapping quality to the specific needs of each host device, improving overall system performance.
2Productivity
If multiple address mapping tables are used to optimize performance, then the productivity improves, but the device complexity increases due to multiple mapping tables and selection logic
Solution Approach 1:
The patent segments the address mapping function into multiple distinct mapping tables, each optimized for specific access patterns. Instead of using a single complex mapping table that must handle all access patterns, the system divides the mapping function into separate tables (first, second, third, fourth mapping tables), each handling specific types of accesses. This segmentation simplifies the logic within each table while providing diverse optimization capabilities across different host devices.
Solution Approach 2:
The patent changes the parameters of the address mapping system by maintaining multiple mapping tables with different mapping characteristics and selectively switching between them based on host device access patterns. This parameter change approach allows the system to optimize performance by selecting the appropriate mapping table for each access pattern without requiring a single highly complex adaptive structure.
3Loss of time
If address mapping is optimized for specific access patterns, then the latency and power consumption improve, but the adaptability to different host devices deteriorates
Solution Approach 1:
The patent implements a universal address mapping system that can serve multiple host devices with different access patterns by maintaining multiple mapping tables. The memory controller is designed to handle various access patterns (sequential, random, interleaved, etc.) by selecting the appropriate mapping table for each host device, making the system universally applicable to different host devices while optimizing performance for each specific access pattern.
Solution Approach 2:
The system dynamically adapts to different host devices by selecting appropriate mapping tables based on observed access patterns. This dynamic behavior allows the system to optimize latency and power consumption for each host device's specific access characteristics while maintaining compatibility with a wide variety of host devices through pattern recognition and adaptive selection.
Data Source
AI summary
A memory controller includes a plurality of ports coupled with a host device and a plurality of channels coupled with a memory device. The memory controller also includes an arbiter receiving a first address received through the plurality of ports to output the first address; a mapping table storage block, including a plurality of address mapping tables, selecting an address mapping table, corresponding to the first address, among the plurality of address mapping tables and outputting the selected address mapping table as a variable address mapping table; an address mapping block mapping the first address to a second address according to the variable address mapping table, and a fixed address mapping table; and a scheduler outputting the second address to the channels. The plurality of address mapping tables may employ different methods of mapping one or more first bits of the first address to the second address.