TMS320C6671 PCIe - MSM SRAM

user4199520

Other Parts Discussed in Thread: TMS320C6671

Hi Everyone,

I have a question about TMS320C6671. We would like to use PCIe interface of TMS320C6671 without using any external DDR3 memories. Because of power budget at our project, we will use internal MSM SRAM (it is 4MB) of C6671 for all operations. My questions related with that are;

Is it possible to use PCIe interface just only using internal MSM SRAM?

Not connecting DDR3 to C6671 brings any limitations except performance?

Thanks for the replies.

Best Regards

over 9 years ago

0 Raja over 9 years ago

TI__Guru* 81335 points

user4199520,

Welcome to the TI E2E forum. I hope you will find many good answers here and in the TI.com documents and in the TI Wiki Pages (for processor issues). Be sure to search those for helpful information and to browse for the questions others may have asked on similar topics (e2e.ti.com). Please read all the links below my signature.

We will get back to you on the above query shortly. Thank you for your patience.

0 Raja over 9 years ago

TI__Guru* 81335 points

Hi,

Is it possible to use PCIe interface just only using internal MSM SRAM?

From my understanding, Yes. It is possible however I think we do not have direct demos/examples demonstrate the same.

I will check and get back to you on this. Thank you

0 Raja over 9 years ago in reply to Raja

TI__Guru* 81335 points

Also you can refer PCIe FAQ wiki for additional information,

0 Victor Kazmirenko over 9 years ago

Guru 13202 points

Hello,
AFAIK, presence of external memory is not required for PCIe peripheral to operate. TI's LLD guts can be placed in on-chip memories. As to exchange buffer, its location is flexible, and of course, it can be places in MSMCSRAM. And I would not say having no external memory is somehow critical for PCIe performance. From my experience, with chunk of data as large as 32KB one can reach top utilization numbers, which do not increase with larger buffers. However, a critical point is to use DMA to run PCIe. So the key question what would be a PCIe peer for your DSP, does it support DMA and so on.