Address Decoder Error Detection Using Regenerated Address Comparison
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Solution Overview
Problem
Instruction decoders in microprocessors face challenges in accurately processing instructions due to errors in address decoding, which can lead to incorrect register addressing and subsequent operational errors, particularly in systems with small bit widths where a single faulty bit can cause significant issues.
Innovation Solution
An error detection device is implemented for address decoders using a 1-out-of-n decoder, comprising a regeneration device and a signal generation device to detect errors by generating a regenerated address and comparing it with the input address, and outputting signals to indicate error-free or erroneous conversions, thereby increasing the reliability of address decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error detection and correction mechanisms are added to address decoders, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by regenerating the input address from the output address before comparison. The regeneration device reconstructs the address using the same decoding logic, and this regenerated address is then compared with the original input address to detect errors before they propagate to subsequent operations.
Solution Approach 2:
The patent implements feedback by using the output address to regenerate the input address, which is then fed back for comparison. The error detection signal generated from this comparison feeds back into the system to trigger error handling mechanisms, creating a closed-loop error detection system that continuously monitors decoding accuracy.
2Adaptability or versatility
If multiple control sequences are associated with instructions based on status signals, then adaptability is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the regenerated address in the regeneration device before comparison is needed. This allows the error detection mechanism to be ready in advance, reducing the time penalty during actual instruction execution by avoiding complex real-time computations.
Solution Approach 2:
The patent uses copying by creating a regenerated copy of the input address from the output address. This copy is then compared with the original to detect errors, allowing the system to verify address integrity without fundamentally changing the multi-sequence control structure or adding significant processing overhead.
Data Source
AI summary
An error detection device for an address decoder converting an input address to an associated output address out of a plurality of valid output addresses using a 1-out-of-n decoder, the error detection device including a regenerator for generating a regenerated address on the basis of the output address from the 1-out-of-n decoder, and a comparer for receiving the input address and the regenerated address and to output a signal, on the basis of a comparison of the input address and the regenerated address, which indicates an error in the conversion of the input address to the output address if the input address and the regenerated address do not match, and which indicates an error-free conversion of the input address to the output address if the input address equals the regenerated address.