topic Re: S32G399 DMA Transfer Time Question in S32G

S32G399 DMA Transfer Time Question

Siyan — Thu, 11 May 2023 08:50:12 GMT

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?

Re: S32G399 DMA Transfer Time Question

Daniel-Aguirre — Thu, 11 May 2023 18:36:06 GMT

Hi,

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

Please, let us know.

Re: S32G399 DMA Transfer Time Question

Siyan — Fri, 12 May 2023 00:56:07 GMT

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.

Re: S32G399 DMA Transfer Time Question

Daniel-Aguirre — Fri, 12 May 2023 15:36:12 GMT

Hi,

Thanks for your feedback.

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

Please, let us know.