Pipelined ECC Processing Circuit for Single-Cycle Data Correction
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Solution Overview
Problem
Existing error correction schemes in processing systems, such as micro-controllers, introduce additional propagation delays due to complex combinational logic circuits, limiting the clock frequency and overall system performance.
Innovation Solution
Implement a pipelined architecture in the error detection and correction circuit, utilizing a multiplexer and control circuits to manage read requests and error signals, allowing data correction within one clock cycle while reducing propagation delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex combinational logic circuits are used for error correction, then error detection and correction capability is improved, but propagation delay increases and clock frequency is limited
Solution Approach 1:
The error correction circuit is divided into multiple pipeline stages, with each stage performing a specific function (error detection, syndrome calculation, correction). This segmentation allows parallel processing of different parts of the data, reducing the overall propagation delay while maintaining comprehensive error correction capability.
Solution Approach 2:
Error detection and syndrome calculation are performed in advance during the pipeline stages before the final correction step. By preparing error correction information beforehand, the circuit avoids lengthy sequential processing, enabling faster clock frequencies while maintaining reliable error correction.
2Reliability
If complex combinational logic circuits are used for error correction, then error detection and correction capability is improved, but propagation delay increases
Solution Approach 1:
The circuit is segmented into pipeline stages that process different aspects of error correction simultaneously. This parallel processing approach reduces the critical path delay while maintaining full error correction capability, directly addressing the propagation delay issue.
Solution Approach 2:
The circuit transitions from a static combinational logic structure to a dynamic pipelined architecture with registered stages. This dynamic structure allows the circuit to reset and reprocess data in discrete time intervals, reducing the effective propagation delay for each data word while maintaining comprehensive error correction.
3Speed
If pipelined architecture is implemented, then clock frequency and processing speed are improved, but circuit complexity increases
Solution Approach 1:
While segmentation into pipeline stages does increase structural complexity, it modularizes the circuit into reusable units. Each pipeline stage can be independently optimized and verified, making the overall complex circuit more manageable and potentially more efficient in terms of area utilization compared to a monolithic design.
Data Source
AI summary
A slave provides second data bits and ECC bits in response to a master read request. First data bits are generated by selecting between the second data bits and third data bits produced from error correcting the second data bits. The third data bits are generated with a delay of one clock cycle with respect to the second data bits. If an address of the read request is stored to a memory, a control signal is set indicating that the first data bits are invalid and this drives selection of the third data bits (with the first data bits now being valid in a following clock cycle). If an error signal is asserted when the address is not stored to the memory, action is taken to store the address to the memory and a further control signal is set to indicate that the read request should be repeated.