A Lookup Table Structure That Can Realize the Function of Distributed Memory

Abstract

The invention relates to a look-up table structure capable of realizing distributed memory functions, including: an address decoder, a byte enable module, a six-input look-up table, a five-input look-up table, a first four-input look-up table, a second four-input look-up table look-up table and independent inputs. The lookup table structure that can realize the function of distributed memory provided by the present invention, on the basis of the multi-granularity lookup table, only adds a write address decoder and a byte enable module, and realizes Simple dual-port memory with two modes. The readout function of this structure reuses the multiplexer of the original LUT table, thereby reducing the area.

Description

technical field [0001] The invention relates to a look-up table structure capable of realizing the function of a distributed memory, and belongs to the technical field of integrated circuit design. Background technique [0002] The current programmable logic unit is the basic building block of the FPGA chip that can realize various logic functions, and its basic structure includes look-up tables, flip-flops, and multiplexers. [0003] In modern FPGAs, in addition to programmable logic cells, block memory and multipliers are often embedded in the FPGA fabric. Among them, the memory is mainly used to store the data to be processed or generated in the user circuit. At the same time, in order to improve the effect of the block memory, the capacity of the block memory should generally not be too small, otherwise the area efficiency will be low. [0004] Considering that the programmability of FPGA is realized through configuration memory, an FPGA with 100K logic units often inc...

AI Technical Summary

Problems solved by technology

However, there are the following problems: 1. Most of the programmable logic blocks of existing FPGA chips use a fixed-grained look-up table structure, and generally support distributed memory functions, such as slices of xilinx; 2. Existing FPGAs support the look-up table split structure. Programmable logic units include Intel's ALM, which supports distributed memory functions, but this structure needs to have more common input ports when implementing different function combinations in logic mode

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