S32G399 DMA Transfer Time Question

[Siyan]

Hi, NXP,

I use DMA transfer data form NorFlash to SRAM for image loading.

Confused about the time it spending on data transfer.

Transfer total 4MB data from Nor to SRAM:

1.Use eDMA_0 only, it spends 28ms

2.Use eDMA_0 to transfer 2MB and eDMA_1 to transfer remain 2MB at the same time, it spends 50ms

Why is the time increasing instead of decreasing?

[Daniel-Aguirre]

Hi,

For S32G, it seems that the AHB interface is the limiting factor for eDMA under QSPI data transfers.

Please, let us know.

[Siyan]

Hi, Daniel,
Does NXP have any suggestion about how to reduce the image loading time.
If our product loads 20MB image from Nor to SRAM, it will spend about 28ms*5=140ms which is unacceptable.

[Daniel-Aguirre]

Hi,

Thanks for your feedback.

At what frequency do you have configured the QSPI interface for booting?

Please, let us know.