Problem with SDRAM

[larsandersen]

Hi

We have a problem with the SDRAM on our development board with an i.MXRT1062 MCU and an IS42S16160J SDRAM from ISSI that I cannot figure out. The problem is that data written to the SDRAM is written on 2 different locations with 128 bytes apart. E.g. if I write to address 8000_0000 then the data is written to address 8000_0080 too.

We have swapped the address pins on SDRAM as illustrated below. Is that a problem? What else could cause this problem?

I'm using the Device Configuration Data (DCD) from SDK version 2.6.2. Do I need to make any modifications to the DCD?

Regards,

Lars

[art · Accepted solution]

Of course, swapping the address signals of SDRAM is not allowed and causes the problem you describe. The address signals of the processor and SDRAM must be interconnected in strict order. So, fix it first.

Have a great day,
Artur

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