iMXRT1176 SEMC SDRAM data rate

[Abisheikv2]

Hello,

We are using iMXRT1176 in our product and we have planned to use external SDRAM to execute the firmware of M7 and M4 cores also SDRAM will be used by CSI, PXP and USB. 1280x720P at 30 fps will be got from CSI, converted with PXP and pushed to USB. So I'd like to know if there is any limitation in the bandwidth of SDRAM. Do you have any data regarding that? 

Regards,

Abisheik S. 

[jeremyzhou]

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1) So I'd like to know if there is any limitation in the bandwidth of SDRAM. Do you have any data regarding that?
-- To provide the fastest possible support, I'd highly recommend you refer to the Chapter 29 Smart External Memory Controller (SEMC) in the RM.
Have a great day,
TIC

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[Abisheikv2]

Hello Jeremy,

I've checked the RM but there is no data regarding read and write speeds or bandwidth. My query here is we have two cores and three peripherals accessing SDRAM via SEMC, What is the MAX data rate / bandwidth of SDRAM? It'll be helpful for us to design the Firmware accordingly.

Regards, 

Abisheik S.

[jeremyzhou]

Hi，
Thanks for your reply.
In the theory, the max SDRAM bandwidth of RT1170 is 200x2 = 400 MB/s, however, it's impossible to make it in real design, it's not only affected by the hardware circuit design but so affected by the software side, such as cache feature, software architecture, etc.
Moreover, the SDRAM itself may affect the bandwidth too.
Have a great day,
TIC

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