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Transcendental function device and method for realizing transcendental function utilizing same

A technology that transcends functions and mantissa parts. It is applied in the direction of electrical digital data processing, digital data processing components, instruments, etc. It can solve the problems of low processing precision and large circuit delay of fixed-point CORDIC structure, and overcome the large processing delay and implementation cost. small effect

Inactive Publication Date: 2010-01-20
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0006] In order to overcome the deficiencies of the large circuit delay of the floating-point CORDIC structure and the low processing precision of the fixed-point CORDIC structure, the present invention provides a transcendental function device, which uses a high-precision, sequentially iterative HPOR CORDIC hardware structure to generate a transcendental function. The exponential change of the intermediate variable is mapped to the number of iterations, eliminating the exponential operation of the floating-point transcendental function device without introducing unnecessary rounding errors

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  • Transcendental function device and method for realizing transcendental function utilizing same
  • Transcendental function device and method for realizing transcendental function utilizing same
  • Transcendental function device and method for realizing transcendental function utilizing same

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Embodiment Construction

[0024] refer to Figure 1~4 , the present invention adopts the transcendental function device of HPOR CORDIC structure in structure. The whole device is composed of three parts: pre-processing unit, processing unit and post-processing unit. The pre-processing unit is used to transform the input value of the transcendental function, the processing unit is responsible for implementing specific processing, and the post-processing unit normalizes the output result of the processing unit. The preprocessing unit receives processing instructions and floating-point source operands issued by the processor, and the selector and divider of the preprocessing unit can normalize the source operands according to different processor instructions: if the processor instruction is a hyperbolic function , normalize the source operand to [-1 / 2, 1 / 2], if the processor instruction is a trigonometric function, normalize the source operand to [-π / 4, π / 4]. The preprocessing unit decomposes the normal...

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Abstract

The invention discloses a transcendental function device and a method for realizing the transcendental function utilizing the same. The device comprises a preprocessing unit, a processing unit and a post-processing unit. The processing unit is composed of a counter register 1, a counter register 2, an X register and a processing passage thereof, a Y register and a processing passage thereof, a Z register and a processing passage thereof, and a control state machine. By utilizing an HPOR CORDIC device, one-one correspondence relation between indexes of a median generated in processing and a change of the counter is established, and the change of the counter register 2 represents the change of the indexes, therefore only a magnitude portion is processed to eliminate an index operation and mantissa match exponents in a floating decimal CORDIC. The device further overcomes shortcomings of large delay of the floating decimal CORDIC device and poor processing precision of a fixed point CORDIC device, and the realization price of hardware is much low.

Description

technical field [0001] The invention relates to a transcendental function device. It also relates to a method for realizing a transcendental function with the transcendental function device. Background technique [0002] Document 1 "US Patent No. US20060200510" discloses a CORDIC angle processing device. There is a scaling unit in the device. Before the CORDIC transformation, the device performs left-shift transformation on the input data. reverse transformation process. The device reduces the rounding error in the processing through the left shift operation, and can improve the processing precision of the CORDIC angle. However, the error caused by the fixed-point data representation in CORDIC transformation is very large, and the accuracy improvement obtained by this improvement measure is relatively limited. [0003] Document 2 "US Patent No. US20060233284" discloses a CORDIC rotation device, which uses fixed-point CORDIC transformation to realize angle rotation, and us...

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Application Information

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IPC IPC(8): G06F7/544
Inventor 高德远田杭沛樊晓桠张盛兵王党辉魏廷存黄小平张萌郑然
Owner NORTHWESTERN POLYTECHNICAL UNIV
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