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ADSP 218x AV bit - Ephreal - 2011-06-16 12:47:00

Hi

I'm corrently playing around with an 2183 ADSP, and writing some test
programs for it. However I fail to understand the logic behind the AV bit
in the astat register. I have to user guide, and I've read and understand
the principle of it however I would like a more indepth knowledge.

Can anyone here explain how it works, and/or have som examples how to test
the bit. 

Thank you 

/Ephreal

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Re: ADSP 218x AV bit - Vladimir Vassilevsky - 2011-06-16 12:56:00


Ephreal wrote:

> Hi
> 
> I'm corrently playing around with an 2183 ADSP, and writing some test
> programs for it. However I fail to understand the logic behind the AV bit
> in the astat register. I have to user guide, and I've read and understand
> the principle of it however I would like a more indepth knowledge.
> 
> Can anyone here explain how it works, and/or have som examples how to test
> the bit. 

AV = ALU overflow. It is set whenever the ALU result was folded from 
positive to negative or from negative to positive through 32767/-32768 
border.


Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com