Add a second QSPI memory device.

[chadgraham]

Hello,

I would like to add a second QSPI memory device to our design that uses the second CS of the bus and is located immediately after the existing device.  I am using the RT1060-EVK and we've been using the existing QSPI device as our XIP location so I'm fairly confident that the board and application are setup properly.

We've added the second CS to the pin mux and it is setup the same as the first CS.  I have tried modifying the memory configuration to add a second chip and I'm using the same configuration file as the driver, but the memory view tool shows the new "region" as inaccessible.

Is there an app note or set of instructions that walks through adding a second device?

[FelipeGarcia]

Hi Chad,

If you are going to use a different Flexspi interface to connect to the second memory I think you can refer to the flexspi_nor_polling_transfer example of the SDK. This example enables a QSPI in application to write and erase some data. You can take same structure to initialize your second QSPI flash.

Also you can take a look to this application note: https://www.nxp.com/docs/en/application-note/AN12564.pdf

Best regards,

Felipe

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[chadgraham]

Hello Felipe,

Do I need to use a second Flexspi interface to accomplish this or can I simple modify the existing one to add a second CS?  I plan to stick with the same signals for the clock and data lines.  Thanks.

[FelipeGarcia]

Hi Chad,

As it is mentioned in the AN, you can use the same FlexSPI port but you must use the same flash device, and keep the same flash timings.

Regards,

Felipe

[chadgraham · Accepted solution]

Hello,

After much hardship, I was able to get this to work.  In case other people are interested, I posted a working version of the example code at FlexSPI A2 Chip Select Not Toggling.