MCU-PLUS-SDK-AM243X: gpmc_psram_io example read data mismatch

Jared Vega

Part Number: MCU-PLUS-SDK-AM243X
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Hello,

I am using the AM243x MCU+ SDK v 10.00.00 for the AM243x EVM development board to test out the included RAM. I am using the GPMC PSRAM example, but it doesn't seem to read the same numbers it writes. I haven't made any changes to the example.

Debugging and looking into the receive buffer, the values read from the RAM are 30,31,30,31... where it should be 0,1,2,3...

It also occasionally gets into a fail state inside the Ram_write() function.

The example I am using is linked below, any help would be appreciated!

AM243x MCU+ SDK: GPMC PSRAM (ti.com)

11 months ago

0 Swargam Anil 11 months ago

TI__Mastermind 45916 points

Hello Jared vega,

Before going to the code.

Please share connectivity between SOC and Memory with the address and data and control lines.

Share details about what the size of PSRAM memory is connected to SOC and datasheet of PSRAM.

Regards,

Anil.

0 Jared Vega 11 months ago

Prodigy 20 points

I'm not sure if I can easily share the SOC and Memory connectivity pdf, but it is found in this zip inside "PROC101C(005)_SCH.pdf" on page 12 titled DDR Interface. A0-A13 are connected for addressing and DQ0-DQ15 are connected for data.

https://www.ti.com/lit/zip/sprr465

The PSRAM is a MT40A1G16KD-062E IT:E and its datasheet is found here MT40A4G4_2G8_1G16_RevH_Aug2021.pdf (digikey.com) This has 2 gigabytes of memory.

I was rereading the program example I am using and it says, "An external PSRAM needs to be connected to the device via GPMC interface." I assumed that the MT40A1G16KD-062E IT:E is the RAM needed for this example to work.

0 Swargam Anil 11 months ago in reply to Jared Vega

TI__Mastermind 45916 points

Hello Jared vega,

The GPMC can support PSRAM / NOR / NAND memories and does not support for SDRAM memories.

The FAQ below gives information about how much size of memories connected to GPMC.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1349234/faq-am24x-am64x-am62x-what-are-the-maximum-sizes-of-nand-or-nor-or-psram-memories-that-can-be-connected-to-gpmc-for-the-am24x-am64x-am62x

Regards,

Anil.

0 Jared Vega 11 months ago in reply to Swargam Anil

Prodigy 20 points

Thanks for helping with that question, it sounds like I need to start over and use a different example to access the MT40A1G16KD-062E IT:E SDRAM. Do you know if there is an example from the SDK or another post that can help me get started with setting up a project in Code Composure Studio? I'd like to use the API's found in AM243x MCU+ SDK: RAM (ti.com) but I don't know how to set up the Sysconfig file.

0 Swargam Anil 11 months ago in reply to Jared Vega

TI__Mastermind 45916 points

Hello Jared vega,

You can't validate the above DDR with the GPMC.

Currently in MCU+SDK, users can validate the GPMC with PSRAM / NOR/ NAND memories.

In MUC+SDK, we have tested the below PSRAM memory .

The Ram_write and Ram_Read API are used to write and read operations.

https://xonstorage.blob.core.windows.net/pdf/issi_is66wve4m16eall70blitr_apr22_xonlink.pdf

Regards,

Anil.

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MCU-PLUS-SDK-AM243X: gpmc_psram_io example read data mismatch