Decoder Address System for Interleaved Local Peripheral Ranges
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Solution Overview
Problem
Existing address decoding methods struggle to efficiently distinguish between complex allocations of local and peripheral ranges in an address space, particularly when these ranges are interleaved and have varying sizes, making quick decoding impractical.
Innovation Solution
The implementation of a decoder address system that uses fewer bits than the total number of address bits, utilizing match circuits and a carry chain to determine if an input address is within a specific local range without intersecting peripheral ranges, allowing for efficient decoding of complex address space allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single address bit is used to split the address space between local and peripheral devices, then address decoding speed is improved, but the ability to handle complex interleaved allocations is lost
Solution Approach 1:
The patent segments the address space into multiple hierarchical levels using multiple address bits (A[0], A[1], A[2], etc.) instead of a single bit. Each address bit enables the decoder to distinguish between different ranges (local vs. peripheral) at progressively finer granularities, allowing complex interleaved allocations to be represented as a series of binary decisions based on multiple address bits.
Solution Approach 2:
The patent transitions from a one-dimensional single-bit splitting approach to a multi-dimensional approach using multiple address bits. By utilizing additional address bits (A[1], A[2], etc.), the system creates a multi-dimensional decoding space that can represent complex interleaved allocations while maintaining fast decoding through parallel evaluation of multiple bit conditions.
2Adaptability or versatility
If multiple address bits are used to decode complex interleaved allocations, then allocation flexibility is improved, but decoding complexity increases
Solution Approach 1:
The patent employs dynamic logic circuits that evaluate multiple address bits (A[0], A[1], A[2], etc.) in a coordinated manner. The decoder dynamically determines the appropriate range based on the combination of address bits, using conditional logic that adapts to different allocation patterns. This dynamic evaluation allows the same hardware structure to handle various complex interleaved allocations without requiring separate dedicated circuits for each pattern.
3Measurement precision
If all address bits are used for decoding, then decoding accuracy is improved, but the number of bits required exceeds the minimum needed
Solution Approach 1:
The patent extracts and utilizes only the necessary address bits (A[0], A[1], A[2], etc.) required to distinguish between local and peripheral ranges in the specific allocation scheme, rather than using all available address bits. The decoder is configured to selectively evaluate specific address bits based on the allocation pattern, extracting the minimal subset needed to achieve accurate decoding while reducing the total number of bits that must be processed.
Data Source
AI summary
Decoding an address in an address space including a plurality of local ranges and a plurality of peripheral ranges is described. Various approaches for decoding an input address include determining decoder address bits of the address space that distinguish local ranges from each other and that distinguish local ranges from peripheral ranges. The local and peripheral ranges are interleaved and have a plurality of sizes. The number of decoder address bits is less than the number of address bits in the address space and less than the number of local ranges plus the number of peripheral ranges. Using the decoder address bits of an input address, it is determined whether the input address is within a portion of the address space that includes one of the local ranges and does not include any of the peripheral ranges nor the local ranges other than the one of the local ranges.