Difference Between ICache and Cache

Chia-Ning Wang

Other Parts Discussed in Thread: SYSBIOS

Hi TI,

I came across ICache while trying to find a work-around for not being able to call Cache_wb from a SWI context and was wondering about what the difference in operation was between ICache_wb and Cache_wb.

Best Regards,

Johnny

over 7 years ago

0 Raja over 7 years ago

TI__Guru* 81335 points

Johnny,
I will ask our experts to answer this. Thank you for your patience.

0 Raja over 7 years ago

TI__Guru* 81335 points

Johnny,
Which document and DSP part number are you referring? I could not find any information about ICache. Thank you.

0 ran35366 over 7 years ago in reply to Raja

TI__Genius 12805 points

I am not sure where you read it, but usually ICache refers to instruction cache, or L1P cache in C66 and ARM

ICache is used to cache instructions so usually it cannot be used it for data

Ran

0 Chia-Ning Wang over 7 years ago in reply to ran35366

Intellectual 400 points

I found documentation on it here.
software-dl.ti.com/.../Cache.html

I notice the module-wide constants include data-cache as well and the calling context includes HWIs and SWIs.

0 Raja over 7 years ago in reply to Chia-Ning Wang

TI__Guru* 81335 points

Francis,

As Ran suggested above, there is no function called ICache_wb in the page referred.

module-wide functions

   Void Cache_disable( Bits16 type );

   Void Cache_enable( Bits16 type );

   Void Cache_inv( Ptr blockPtr, SizeT byteCnt, Bits16 type, Bool wait );

   Void Cache_wait( );

   Void Cache_wb( Ptr blockPtr, SizeT byteCnt, Bits16 type, Bool wait );

   Void Cache_wbInv( Ptr blockPtr, SizeT byteCnt, Bits16 type, Bool wait );

Thank you.

0 ran35366 over 7 years ago in reply to Raja

TI__Genius 12805 points

I am not an expert on sysbios, but from the file that you attached I see that there is a structure iCache that has L1D and L1P members, so iCache does not refer to instruction cache, my apology.

This looks like part of our XDS software that builds code from cfg file. I did not see the iCache_wb API available for any application library or include file. So sorry, I do not think that it will solve your problem.

Ran

0 Chia-Ning Wang over 7 years ago in reply to ran35366

Intellectual 400 points

Ok, thanks!

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Difference Between ICache and Cache