原创 ADI DSP基础教程:Blackfin的内核之MSASHIFTER(BF533为例)

2017-5-5 11:18 2387 12 12 分类: 处理器与DSP

BARREL-SHIFTER,看图说话!


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Overview:


The shifter performs bitwise shifting for 16-bit, 32-bit or 40-bit inputs and yields 16-bit, 32-bit, or 40-bit outputs.


Functions


Arithmetic Shift:


The Arithmetic Shift instruction shifts a registered number a specified distance and direction while preserving the sign of the original number.

The sign bit value back-fills the left-most bit positions vacated by the arithmetic right shift.


Logical Shift:


The Logical Shift instruction logically shifts a registered number a specified distance and direction.

Logical shifts discard any bits shifted out of the register and backfill vacated bits with zeros.


英文没意思,下一章开始,正式中文加视频讲解,详细说说Blackfin的外设。

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