FPGA Look-Up Table Single-Direction Pass Gate Architecture
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Solution Overview
Problem
Current Field-Programmable Gate Array (FPGA) look-up tables face challenges in achieving fast operating frequencies and low power consumption on a small silicon area due to high current drive requirements, signal propagation delays, and irregular layouts, which hinder compact integration and increase manufacturing costs.
Innovation Solution
A look-up table architecture with pass gates aligned in a single direction, allowing for a dense layout, simple routing, and efficient timing management, using double gate transistors and standard SOI or FINFET technology to reduce silicon area and power consumption, while enabling the use of smaller registers and shared interconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional FPGA look-up table architecture with multiple directions of pass gates is used, then the layout flexibility is improved, but the manufacturing complexity and area consumption increase
Solution Approach 1:
The patent applies asymmetry by orienting all pass gates in a single direction rather than using symmetric multi-directional arrangements. This asymmetric configuration simplifies the manufacturing process and reduces area consumption while maintaining the necessary layout flexibility through the systematic arrangement of pass gates and registers in one direction.
2Speed
If high current drive capability is provided for fast operating frequencies, then the operating speed is improved, but the power consumption increases
Solution Approach 1:
The patent employs parameter changes by utilizing double gate transistors with independently controllable gates. This allows precise control of the current drive capability, enabling the circuit to achieve fast operating frequencies when needed while consuming less power during normal operation. The threshold voltage and channel characteristics can be adjusted to optimize the trade-off between speed and power consumption.
3Speed
If signal propagation delay is reduced for faster operation, then the operating frequency is improved, but the signal strength and noise immunity deteriorate
Solution Approach 1:
The patent uses double gate transistors as intermediary elements that can actively boost and regenerate signals during propagation. The controlled channels provide signal strength enhancement while maintaining fast propagation speeds, effectively acting as signal repeaters that improve both speed and reliability simultaneously rather than allowing the natural trade-off.
4Area of stationary object
If compact integration is achieved on small silicon area, then the device density is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies segmentation by dividing the look-up table into modular units of pass gates and registers arranged in a systematic single-direction pattern. This segmentation creates repeatable building blocks that can be manufactured with standard precision, avoiding the need for high-precision custom layouts while achieving compact integration through efficient use of silicon area.
Data Source
AI summary
The present invention relates to a look-up table architecture and to an FPGA comprising the same. The look-up table architecture comprises a registers group comprising a plurality of registers configured to issue register signals, and a programmable logic comprising a plurality of pass gates configured to be controlled at least by the register signals, the registers group and the programmable logic forming a look-up table, wherein the pass gates are placed in a single direction.