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Discussion Groups | Analog Devices DSPs | permanent write in cache
Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).
permanent write in cache - rahi...@yahoo.com - Apr 14 1:26:00 2005
dear all,
plz somebody solve my problem, (processor TS201 tigersharc)
problem description :
i have a matrix of size 256 * 512. i want to perform 2D FFT on the matrix,
there are two twiddle vectors, one of lenght 256 and other 512.
not to perform 2D FFT, i bring the twiddle vectors and data values in cache then perform FFT (like example of FFT_flt32_c in benchmark)
i want to write twiddles in cache permanently with just one write for 2D FFT and want that the incoming data values should not replace the twiddles.
how can i permanently write to cache ?
regards,
rahim
www.qau.edu.pk
(You need to be a member of adsp -- send a blank email to adsp-subscribe@yahoogroups.com )
Re: permanent write in cache - Jon Harris - Apr 15 16:24:00 2005
I don't know about the tigersharc, but other SHARC DSPs I have used have the
ability to freeze the cache with a bit in the control register. Have a look
into that.
--- rahimq@rahi... wrote: > dear all,
> plz somebody solve my problem, (processor TS201 tigersharc)
>
> problem description :
>
> i have a matrix of size 256 * 512. i want to perform 2D FFT on the matrix,
> there are two twiddle vectors, one of lenght 256 and other 512.
>
> not to perform 2D FFT, i bring the twiddle vectors and data values in cache
> then perform FFT (like example of FFT_flt32_c in benchmark)
>
> i want to write twiddles in cache permanently with just one write for 2D FFT
> and want that the incoming data values should not replace the twiddles.
>
> how can i permanently write to cache ?
>
> regards,
>
> rahim
> www.qau.edu.pk __________________________________
(You need to be a member of adsp -- send a blank email to adsp-subscribe@yahoogroups.com )
ability to freeze the cache with a bit in the control register. Have a look
into that.
--- rahimq@rahi... wrote: > dear all,
> plz somebody solve my problem, (processor TS201 tigersharc)
>
> problem description :
>
> i have a matrix of size 256 * 512. i want to perform 2D FFT on the matrix,
> there are two twiddle vectors, one of lenght 256 and other 512.
>
> not to perform 2D FFT, i bring the twiddle vectors and data values in cache
> then perform FFT (like example of FFT_flt32_c in benchmark)
>
> i want to write twiddles in cache permanently with just one write for 2D FFT
> and want that the incoming data values should not replace the twiddles.
>
> how can i permanently write to cache ?
>
> regards,
>
> rahim
> www.qau.edu.pk __________________________________
(You need to be a member of adsp -- send a blank email to adsp-subscribe@yahoogroups.com )