Bit field operation circuit and bit field operation method

Abstract

The invention discloses a bit field operation circuit and a bit field operation method. The bit field operation circuit comprises a first shifter for generating a first intermediate data according to an original data 0, a second shifter for generating a second intermediate data according to a source operand A of a source register Rm, a first logic and circuit for generating a third intermediate data according to the first and the second intermediate data, a third shifter for generating a fourth intermediate data according to the third intermediate data, a fourth shifter for generating a fifth intermediate data according to an original data 0Xffffffff, a fifth shifter for generating a sixth intermediate data according to the fifth intermediate data, a second logic and circuit for generating a seventh intermediate data according to a destination operand B in a destination register Rs and the sixth intermediate data, a logic or circuit for generating an eighth intermediate data according to the seventh intermediate data and the fourth intermediate data, and a selector for generating the final result C according to the eighth intermediate data and the fourth intermediate data. The bit field operation circuit not only can keep the original value of the bit field operand but also can reset the bit field operand in a bit field operation non-placement area.

Description

technical field [0001] The invention relates to a bit field operation circuit and a bit field operation method, belonging to the technical field of digital signal processors. Background technique [0002] At present, the bit field operands in the non-placement area of ​​the signal processing device can only keep the original value and cannot be cleared, and the position of the source operand cannot be changed, only the value can be obtained from the position zero, and the bit field operation is not comprehensive enough. For example: publication number is the patent of CN 101154153A just like this. Contents of the invention [0003] The purpose of the present invention is to provide a bit field operation circuit and a bit field operation method that can maintain the original value of the bit field operand in the non-placement area of ​​the signal processing device, and can also perform a clearing operation, thereby improving the performance of the digital signal device. Di...

AI Technical Summary

Problems solved by technology

[0002] At present, the bit field operands in the non-placement area of ​​the signal processing device can only keep the original value and cannot be cleared, and the position of the source operand cannot be changed, only the value can be obtained from position zero, and the bit field operation is not comprehensive enough.

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