Embedded ip soft core based on plb bus for calculation of rotation angle and calculation method of rotation angle

Abstract

The invention discloses an embedded IP soft core based on a PLB bus and a calculation method for calculating a rotation angle. The calculation IP soft core includes a main control module, a PLB bus timing conversion module, a configuration register module, and a lookup table RAM module. , FIFO module, quadrant conversion module and several iterative modules; multiple iterative modules form a multi-stage pipeline structure, and the iterative module feeds back the output to the input to realize multiple iteration functions. The calculation of the rotation angle adopts a feedback pipeline structure, that is, feedback first and then pipeline The "true" pipeline structure converts the sine and cosine values ​​of single-precision floating-point type into single-precision floating-point angle values, and connects with the on-chip processor through the on-chip bus PLB bus, which is superior to " The "pure" feedback iterative structure and the "pseudo" pipeline structure with pipeline first and then feedback are superior to the "pure" pipeline structure in occupying resources, and are superior to traditional designs in terms of portability in embedded systems.

Description

Technical field [0001] The invention belongs to the field of accurate calculation of complex functions in embedded systems, relates to PLB bus and CORDIC algorithms, and specifically relates to a PLB bus-based embedded IP soft core and a rotation angle calculation method for rotation angle calculation. 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, addition / subtraction, and continuous approximation to achieve the calculation of trigonometric, hyperbolic, exponential, and logarithmic functions. At present, the rotation angle calculation (arctangent calculation) generally adopts a feedback structure or a pipeline structure to implement the CORDIC algorithm, and uses a fixed-point arithmetic unit to perform the addition / subtraction function in the algorithm. The main defect of this scheme is: insufficient accuracy of fixed-point operations. In order to solve the...

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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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