Dual-Mode Embedded Processor for PLD Resource Optimization
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Solution Overview
Problem
The embedding of processors in Programmable Logic Devices (PLDs) results in wasted circuitry, die area, and power when these processors are not utilized as general-purpose processors.
Innovation Solution
A microprocessor embedded in a PLD operates in two modes: a general-purpose mode for executing processes related to the PLD, and a fixed-function mode for emulating specific functions within the PLD's fabric, allowing for efficient use of resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a processor is embedded in a PLD, then processing capability is improved, but circuitry, die area, and power are wasted when the processor is not used as a general-purpose processor
Solution Approach 1:
The processor is designed to perform multiple functions: it can operate as a general-purpose processor for running user applications, and as a fixed-function processor for implementing specific PLD functions such as clock management, reset generation, and interrupt handling. This multi-functionality eliminates the need for separate dedicated circuits, thereby reducing power consumption and resource waste.
Solution Approach 2:
The processor operates in dynamic modes that can switch between general-purpose execution and fixed-function execution based on system needs. When fixed-function operations are required, the processor executes specialized kernels that optimize performance for those specific tasks while consuming less power than full general-purpose operations.
2Adaptability or versatility
If a processor is embedded in a PLD, then processing capability is improved, but circuitry and die area are wasted when the processor is not utilized
Solution Approach 1:
The processor serves multiple purposes within the PLD architecture, functioning both as a general-purpose CPU for user code and as a fixed-function unit for essential PLD operations. This eliminates the need for separate dedicated hardware blocks, thereby reducing the overall die area required for the PLD.
3Adaptability or versatility
If a processor is embedded in a PLD, then processing capability is improved, but circuitry is wasted when the processor is not utilized
Solution Approach 1:
The processor is designed to replace multiple separate circuit blocks that would traditionally be needed for general-purpose processing and fixed-function operations. By consolidating these functions into a single multi-mode processor, the overall circuitry complexity is reduced while maintaining full functionality.
Data Source
AI summary
A method and apparatus for embedding a microprocessor in a programmable logic device (PLD), where the microprocessor has a logic unit that can operate in two modes. A first mode is a general purpose mode running at least one general purpose process related to the PLD, and a second mode is a fixed function mode emulating a fixed function for use by logic configured into a fabric of the PLD (fabric). A memory unit is coupled to the logic unit and to the fabric, and the fabric is operable for transferring signals with the logic unit in relation to the fixed function.