A kind of fpga circuit and its design method

Abstract

The invention discloses an FPGA circuit and a design method thereof. The circuit is composed of an input / output unit, a wiring unit, and a configurable logic unit. The wiring unit includes a first multi-path selector. The configurable logic unit includes a combined logic circuit. The input terminal of the first multi-path selector is connected with the output terminal of the input / output unit; and the output terminal of the multi-path selector and the input terminal of the combined logic circuit are connected directly by a register circuit. Because of the register circuit arranged between the input / output unit and the combined logic circuit of the configurable logic unit, a key path between a register of the input / output unit and a register of the configurable logic unit is shortened, thereby reducing the delay between the two registers is reduced. Therefore, a technical problem that a design requirement of a high-speed signal circuit design can not be met in the prior art can be solved; the function of adjusting the FPGA time sequence according to different design requirements can be realized; and the maximum frequency of the FPGA circuit design is improved.

Description

technical field [0001] The invention relates to the field of programmable integrated circuit design, in particular to an FPGA circuit and a design method thereof. Background technique [0002] FPGA (Field-Programmable Gate Array), that is, Field Programmable Gate Array, is a product of further development on the basis of programmable devices such as PAL, GAL, and CPLD. It emerged as a semi-custom circuit in the field of application-specific integrated circuits (ASIC), which not only solves the shortcomings of custom circuits, but also overcomes the shortcomings of the limited number of original programmable device gates. [0003] Generally speaking, FPGA is composed of the following parts: input and output unit, configurable logic unit, internal storage unit, global clock network unit, multiplier, routing resource (Routing Resource) and other resources. Through the above unit modules, users can freely program to realize the functional circuits they need. At the same time, ...

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Problems solved by technology

[0005] The main technical problem that the present invention solves is: the present invention provides a kind of FPGA circuit and design method, solves the technical problem that in the existing FPGA design, the design critical path delay is relatively long, and the design requirements for high-speed signal circuit design cannot be reached

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