AM625: OSPI Throughput

Tony Tang

Part Number: AM625

#1. From data sheet, the maximum OSPI_CLK is 50MHz in SDK mode, 25MHz in DDR mode.

#. How can it achieve >50Mbyte/s throughput?

https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/09_01_00_08/exports/docs/devices/AM62X/linux/Linux_Performance_Guide.html#ospi-flash-driver

9 months ago

0 Bin Liu 9 months ago

TI__Guru*** 147126 points

Hi Tony,

Tony Tang said:
#. How can it achieve >50Mbyte/s throughput?

This cannot be done in Tap mode, it has to be in PHY mode.

0 Tony Tang 9 months ago in reply to Bin Liu

TI__Mastermind 27121 points

Hi，Bin,

Thanks. What is the OSPI_CLK frequency in PHY mode?

+1 Bin Liu 9 months ago in reply to Tony Tang

TI__Guru*** 147126 points

Tony,

In PHY mode, when transmitting data, the OSPI_CLK frequency is the same as the OSPI internal reference clk, which is up to 200MHz.

0 Tony Tang 8 months ago in reply to Bin Liu

TI__Mastermind 27121 points

Bin,

How to set to PHy mode?

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1339209/am625-how-to-test-the-ospi-raw-mode-benchmark

customer test according to upper post, can only achieve 13+MByte/s throughput. actually the RAW mode is using DD command to access OSPI.

0 Bin Liu 8 months ago in reply to Tony Tang

TI__Guru*** 147126 points

Hi Tony,

Please refer to the "Phy calibration" section in the link below for how to flash the phy calibration pattern. The driver will set to PHY mode once the phy calibration pattern exists on the flash. The documentation has a link for downloading the pattern file.

https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/09_02_01_09/exports/docs/linux/Foundational_Components/U-Boot/UG-QSPI.html

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AM625: OSPI Throughput