High-performance lookup table circuit based on FGPA

Abstract

The invention belongs to the technical field of integrated circuits and particularly relates to a high-performance lookup table circuit based on an FGPA. According to the high-performance lookup table circuit based on the FGPA, a logic gate unit and a transmission gate are mixed, and for instance, a four-input lookup table circuit comprises three inverters, two CMOS transmission gates and one NAND gate. According to the high-performance lookup table circuit based on the FGPA, four levels of pass transistors on a critical path of the circuit are reduced to two levels, the time delay of the critical path is greatly shortened; the low-threshold CMOS transmission gate is applied, unsymmetrical time delay caused by threshold loss is avoided, and therefore the difficulty of design of a follow-up sequential circuit is reduced; the size of each PMOS transistor and the size of each NMOS transistor in the CMOS pass transistors are identical, so that the area of partial PMOS transistors in the pass transistors is reduced by 50%. By the adoption of the high-performance lookup table circuit based on the FGPA, through the improvement of the structure of the circuit, the speed performance, the power consumption performance and the area performance are remarkably improved, and therefore programmable logic resources supported by lookup table logic can be more widely applied.

Description

technical field [0001] The invention belongs to the technical field of FPGA circuits, and in particular relates to a high-performance look-up table circuit. technical background [0002] As an FPGA widely used in integrated circuit design and verification, due to its powerful programmable features and the continuous addition of IP cores such as Block RAM, DSP, high-speed IO, and PLL, the increasingly powerful alternative functional systems make its integration in the future The field of circuit design occupies a pivotal position. However, with the continuous reduction of process size, the scale of digital integrated circuits is getting larger and larger, and the requirements for functional integration and chip performance are also getting higher and higher. In order to verify designs with more comprehensive functions and higher performance requirements, after decades of development, the FPGA structure has undergone major changes, the scale has also increased by several orde...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a FPGA-based look-up table circuit that can reduce the number of stages of the look-up table circuit, reduce the delay of the critical path, and reduce the leakage current, thereby solving problems such as rising and falling time asymmetry

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