topic Re: Query related to Power consumption is DMA in i.MX RT Crossover MCUs

Query related to Power consumption is DMA

suhel_mulla — Mon, 28 Jun 2021 16:55:35 GMT

Hello,

We are using NXP i.MX RT 1052 controller.

We already know that DMA is used for parallel processing and to improve overall processor performance.

But, we are trying to understand whether DMA can be used to minimize current consumption or not.

My question is as below -

Consider the below 2 cases,

SPI DMA is used to transfer SPI data between memory and SPI transfer registers, CPU(Cortex M7 core) is in sleep mode.
Normal SPI is used (SPI DMA is not enabled) to transfer the same amount of data between memory and SPI transfer registers using CPU.

For these 2 cases, in which case, the current consumption will be more?

Also, please provide if any analytical document is available for this.

Re: Query related to Power consumption is DMA

jeremyzhou — Tue, 29 Jun 2021 06:10:57 GMT

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1) My question is as below -
Consider the below 2 cases,
SPI DMA is used to transfer SPI data between memory and SPI transfer registers, CPU(Cortex M7 core) is in sleep mode.
Normal SPI is used (SPI DMA is not enabled) to transfer the same amount of data between memory and SPI transfer registers using the CPU.
For these 2 cases, in which case, the current consumption will be more?
-- Case 2 will cost more power consumption.
And there's an article that explains the DMA's advantage and hopes it can help you.

Hope it helps.
Have a great day,
TIC

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Re: Query related to Power consumption is DMA

suhel_mulla — Tue, 29 Jun 2021 06:10:24 GMT

Thanks for the answer.

Can you share link of the article which explains it?

Re: Query related to Power consumption is DMA

suhel_mulla — Tue, 29 Jun 2021 06:28:40 GMT

Thanks for the answer and sharing the article. It will solve my query.