Single-Cycle Microcontroller Architecture for Noise Reduction
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Solution Overview
Problem
Microcontrollers face challenges in achieving high performance while minimizing clock noise that affects sensitive analog circuits, due to the need for multiple clock cycles to execute instructions and limited register availability, which increases power consumption and pipeline hazards.
Innovation Solution
A microcontroller design that executes instructions in a single clock cycle using a non-pipelined processor with separate program and data memories, a memory management unit, and a point-to-point transport network, allowing for efficient data transfer and operation without internal system buses, thereby reducing noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RISC microcontrollers utilize execution pipelines to improve system throughput, then productivity is improved, but device complexity increases due to pipeline hazards requiring compilers to anticipate conflicts or built-in hardware to detect and handle problems
Solution Approach 1:
The patent extracts and eliminates the pipeline stage from the processor architecture, using a simple single-cycle execution model instead. This removes pipeline hazards entirely while maintaining productivity through efficient single-cycle instruction completion and the use of wait states for memory operations rather than complex pipeline control mechanisms.
2Reliability
If RISC CPU utilizes additional clock cycles to discard instructions during program branches, then reliability is improved by handling branches correctly, but productivity decreases due to decreased performance and increased power consumption
Solution Approach 1:
The patent implements preliminary action by pre-fetching instructions into a buffer before they are needed for execution. During program branches, the fetch mechanism can be redirected to the new target address while the pipeline continues executing from the buffer, eliminating the need to discard instructions and maintaining continuous productivity while ensuring correct branch handling.
3Adaptability or versatility
If microcontrollers integrate complex analog circuitry with high-performance digital blocks, then adaptability is improved, but object-generated harmful factors increase due to clock noise injected into sensitive analog sections
Solution Approach 1:
The patent employs periodic action through synchronized clocking schemes where digital and analog operations are coordinated to periodic cycles. This allows noise from digital switching to be confined to specific time windows when analog circuits are less sensitive, and enables noise cancellation techniques that rely on periodic patterns to maintain both high performance and low noise levels.
4Reliability
If instructions require several clock cycles to execute, then reliability is improved by allowing proper completion of operations, but use of energy increases due to increased power consumption
Solution Approach 1:
The patent implements continuous useful action by maintaining a steady stream of instruction execution without idle cycles. The single-cycle execution model combined with instruction buffering ensures that the processor is continuously productive, completing operations reliably in each cycle while minimizing the total number of cycles required, thereby reducing overall power consumption compared to multi-cycle execution models with idle periods.
Data Source
AI summary
A microcontroller includes a program memory, data memory, central processing unit, at least one register module, a memory management unit, and a transport network. Instructions are executed in one clock cycle via an instruction word. The instruction word indicates the source module from which data is to be retrieved and the destination module to which data is to be stored. The address/data capability of an instruction word may be extended via a prefix module. If an operation is performed on the data, the source module or the destination module may perform the operation during the same clock cycle in which the data is transferred.