topic Re: APS6404L-SQH-ZR PSRAM access issue in i.MX Processors

APS6404L-SQH-ZR PSRAM access issue

dhruvinrajpura — Fri, 17 Jan 2025 12:42:28 GMT

Hello,

I came across the AN13028 Application Note, which mentions that the APS6404L-SQH-ZR PSRAM has been tested with the i.MX RT1050. I have attached PDF for your reference.

I’m trying to interface the APS6404L-SQH-ZR PSRAM with the i.MX8ULP, but I haven’t been successful so far. Is there any way to find the APS6404L-SQH-ZR PSRAM code for any i.MX board that I could use as a reference?

Thanks!

Re: APS6404L-SQH-ZR PSRAM access issue

Manuel_Salas — Mon, 20 Jan 2025 15:02:36 GMT

Hello @dhruvinrajpura

I hope you are doing very well.

Unfortunately we have not any example how to perform HyperBus on i.MX8ULP processor, but you can take as reference the AN12239 (How to Enable HyperRAM with i.MX RT) because is a similar FlexSPI module.

Also, you can find examples for cortex M in the i.MXRT1050 SDK, you can take it as reference.

I hope this really can helps to you.

Best regards,

Salas.

Re: APS6404L-SQH-ZR PSRAM access issue

Alex-APMemory — Wed, 04 Feb 2026 10:47:35 GMT

iMX8ULP have Xccela OPI on board (APS6408L-OBM-BA. The APS6404L-SQ... is a QSPI SDR device (lower pin count, QSPI protocol). You can find example of QSPI code on multiple other NXP platform like just as example RW61..., RT1046 EVK, SLN-SVUI-IOT.... There are few different version of QSPI, like RBX/Non RBX "SQR/SQN", HalfSleep "SQH", impacting performance & power, you can have a lok to datsheet for details.