Embedded rotation angle calculation IP soft core based on PLB bus and rotation angle calculation method

Abstract

The invention discloses an embedded rotation angle calculation IP soft core based on a PLB bus and a rotation angle calculation method. The calculation IP soft core comprises a main control module, a PLB bus timing translation module, a configuration register module, a lookup table RAM module, a FIFO module, a quadrant transformation module and multiple iteration modules; the multiple iteration modules form a multistage pipeline organization, the output is fed back to the input through the iteration modules so that a multiple iteration function can be achieved, a feedback type pipeline organization is adopted by the rotation angle calculation, namely a 'true' pipeline organization with feedback performed earlier and pipeline performed later, single precision floating-point type sine values and cosine values are transformed into single precision floating-point type angle values, and the PLB bus is connected with an on-chip processor through an on-chip bus. The method has the advantages that the method is superior to a 'pure' feedback type iterative structure and a 'false' pipeline organization with pipeline performed earlier and feedback performed later in computation speed, the method is superior to a 'pure' pipeline organization in occupied resources, and the method is superior to a traditional design in portability in embedded systems.

Description

technical field [0001] The invention belongs to the field of accurate calculation of complex functions in an embedded system, relates to a PLB bus and a CORDIC algorithm, in particular to an embedded rotation angle calculation IP soft core and a rotation angle calculation method based on the PLB bus. Background technique [0002] The CORDIC algorithm is a classic method to realize the calculation of complex functions. Its basic idea is to use look-up tables, shifts, and addition / subtraction to realize the calculation of complex functions such as trigonometric functions, hyperbolas, exponents, and logarithms by means of continuous approximation. At present, the rotation angle calculation (arctangent calculation) generally adopts a feedback structure or a pipeline structure to realize the CORDIC algorithm, and uses a fixed-point arithmetic unit to perform the addition / subtraction operation function in the algorithm. The main defect of this scheme is: fixed-point arithmetic pre...

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Problems solved by technology

The main defect of this scheme is: the introduction of FPU will occupy a large amount of logic resources of FPGA, resulting in the lack of logic resources of FPGA

[0004] In the prior art disclosed above: the CORDIC algorithm structure mainly adopts a feedback structure or a pipeline structure, and there is also an improved "pseudo" pipeline structure that feeds back after pipeline; but in the application of embedded systems, the interface encapsulation form and processing The local PLB bus interface of the device is inconsistent and cannot be directly connected to the bus. The IP core for calculating the rotation angle based on the package form of the PLB bus peripheral interface is not yet available.

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