一种FPGA新型逻辑单元结构的设计

提出了一种FPGA可编程逻辑单元的新结构,该结构具有较多的输入端数和输出端数,并加入了专用的快速进位逻辑、专用级联链等功能,使得这种结构可用来实现任意4输入的逻辑函数和某些高达11个变量的输入函数;这种结构还可同时实现两个任意3输入的逻辑函数或最多5输入的某些函数,而且也能实现快速的进位计算和高扇入的逻辑运算.与目前一些商业FPGA的逻辑结构进行比较表明,本文提出的单元结构不仅具有较高的资源利用率,而且在性能和函数实现能力上都有较大的优势.

A Design of FPGA Programmable Logic Cell Structure

This paper presents a new structure of FPGA programmable logic cell. This structure has more input and output ports including adding special fast carry logic ,special cascade chain,and so on. This LC can not only implement arbitrary 4-input and partial 11-input function,but also two arbitrary 3-input or partial 5-input function simultaneously. And it can realize fast carry arithmetic and high fan input logic function. By comparing with existing commercial FPGA logic cell,designed LC not only have high resource utilization ratio ,but also excellent capacity of implementing function and high performance.