any way to optimize the memory read/write for C674x DSP?

Yuefeng Lu

I am writing codes (C now, if possible ASM also) on C674x of DM8148 chip, to convert the RAW image format in memory to a specific format as output. The format conversion is realized by reading 3 words (96 bits or 4 words: 128 bits) -> bit-shift and sum operations -> writing back into memory.

I am afraid the memory read/write takes long time, and I have run out of the budget based on the needs. Can I optimize such procedure, especially reduce the time of read/write memory? e.g. can I read data more than one 32-bit word at one time? or any pipe line way I can do?

Thanks.

Yuefeng

over 11 years ago

0 Yuefeng Lu over 11 years ago

Prodigy 200 points

My application is only for fixed operations

0 Yuefeng Lu over 11 years ago

Prodigy 200 points

I read some docs, finding I need to confirm the configuration in .tcf file for cache enabling. Besides this, any other ways that helpful?

0 Pavel Botev over 11 years ago in reply to Yuefeng Lu

TI__Guru**** 170625 points

Yuefeng,

Refer to the below e2e thread:

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/319115.aspx

In general, the latency impact can be mitigated by a) enabling the cache, or b) using the EDMA to transfer data between off-chip and on-chip memory.

Best regards,
Pavel

0 Yuefeng Lu over 11 years ago in reply to Pavel Botev

Prodigy 200 points

There are operations (sums and bit-shifts) instead of direct copy. I am not sure EDMA can help.

Is my understanding correct?

Or can we read/write data in a bigger unit? like 128 bits (or bigger) at one time?

Thanks.

Yuefeng

0 Pavel Botev over 11 years ago in reply to Yuefeng Lu

TI__Guru**** 170625 points

Yuefeng,

Are you using TI-RTOS or EZSDK 5.05.02.00 or else?

Regards,
Pavel

0 Pavel Botev over 11 years ago in reply to Pavel Botev

TI__Guru**** 170625 points

Yuefeng,

Have you gone through the below resources?

http://www.ti.com/lit/ug/sprufk5a/sprufk5a.pdf

http://www.ti.com/lit/ug/sprufe8b/sprufe8b.pdf

http://www.ti.com/lit/ug/sprug82a/sprug82a.pdf

http://processors.wiki.ti.com/index.php/OMAP-L1x/C674x/AM1x_SoC_Level_Optimizations#c674x_DSP_Related_Optimizations

http://processors.wiki.ti.com/index.php/C674x_DSPLIB

http://www.ti.com/lit/ug/spruf30a/spruf30a.pdf

Regards,
Pavel

0 Yuefeng Lu over 11 years ago in reply to Pavel Botev

Prodigy 200 points

Hi Pavel,

Thanks.

I am using IPNC package.

I'll check the resources you shared, thanks!

Best,

Yuefeng

0 evanP pan over 9 years ago in reply to Yuefeng Lu

Prodigy 120 points

Hi, Yuefeng.

Thanks for your nice sharing. As for me, I have seldom tried to deal with that. It is of great help. I wonder whether you have any exprience about pdf conversion process. Because there is something wrong with my pdf reader. I need convert pdf to text or other formats. Any suggestion will be appreciated. Thanks in advance.

Best regards,

Pan

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any way to optimize the memory read/write for C674x DSP?