AM2634: How do I access the OCSRAM (CORE_CBUSS) with the PRU

Lukas Hauser

Part Number: AM2634

Hello there,

In the TRM of the AM263x, there is a Block diagram where an arrow point from the PRU to the OCSRAM over CORE_BUSS) , so if I understood it correctly, I should be able to access OCSRAM from the PRU. But in the TRM, there is no mention of this. The PRU memory MAP (7.2.3.4.1.2 PRU_ICSSM Local Data Memory Map) also does not mention anything about it. Could you please help me on this issue?

Thanks a lot in advance.

Best regards,

Lukas Hauser

over 3 years ago

0 Dhaval Khandla over 3 years ago

TI__Mastermind 27784 points

Hi
We can directly access OCSRAM from PRU with address 0x70000000.

Regards
Dhaval Khandla

0 Lukas Hauser over 3 years ago in reply to Dhaval Khandla

Prodigy 40 points

Thanks a lot for your answer, it helped a lot. As a follow up question: What are the read and write times for this memory from the PRU? How is it handled if for example an R5F core is accessing the OCSRAM at the same time?

0 Dhaval Khandla over 3 years ago in reply to Lukas Hauser

TI__Mastermind 27784 points

Hi
We are checking internally with experts. Please expect reply by next week.

Regards
Dhaval Khandla

0 Shivasharan Nagalikar over 2 years ago in reply to Dhaval Khandla

TI__Expert 8570 points

PRU Read Latency (64 Bytes of Data from L2) : 175 ns

R5F using DMA Read/Write Latency to ICSSM Internal Memory (64Bytes) : Write - 375ns, Read - 705ns

R5F Read/Write Latency to/from ICSM Internal Memory (64 Bytes) : Write - 2555ns , Read: 3440n

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AM2634: How do I access the OCSRAM (CORE_CBUSS) with the PRU