AM335x PRU shared RAM access

Kanae

Hi Sitara support team,

Regarding the application using AM335x core and PRU;
when AM335x; 300MHz devide accesses to share RAM of PRU; 200MHz,
it takes 200ms with 4-byte reading.
In this case, Using OCM of AM335x is better than using share RAM of PRU?
I suppose that using share RAM of PRU is better because the load of PRU could be reduce,
but not sure...
I would like to make clear it by support team comments.

Best regards,
Kanae

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

What is this "share RAM of PRU"? Where is it located?

0 Kanae over 9 years ago in reply to Biser Gatchev-XID

Guru 10295 points

Hi Biser,
Thank you for your quick response.

"share RAM of PRU" is here.

Best regards,
Kanae

0 Kanae over 9 years ago in reply to Kanae

Guru 10295 points

Sorry, no attached data.

Here is image file.

Kanae

0 Biser Gatchev-XID over 9 years ago in reply to Kanae

TI__Guru**** 393215 points

This RAM is shared between the two PRU cores. Access from the ARM core would be slow to this memory, as it has to go over two interconnects.

0 Kanae over 9 years ago in reply to Biser Gatchev-XID

Guru 10295 points

Hi Biser,

Thank you for your reply.
I understand that ARM core should not access to the share RAM of PRU if I need the access speed.
Using OCM of AM335x is better than using share RAM of PRU in this case, right?

Best regards,
Kanae

0 Biser Gatchev-XID over 9 years ago in reply to Kanae

TI__Guru**** 393215 points

I don't know what the use case is. Can you explain in more details?

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AM335x PRU shared RAM access