AM2434: OSPI is used as single-SPI with SPI Flash at boot and as quad-SPI with CPLD after boot

Hideaki Matsumoto

Genius 9140 points

Part Number: AM2434
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Hi,

My customer wants to use OSPI with Single-SPI Flash at boot. After boot, OSPI is used for communicating with QSPI CPLD.

Is this OSPI usage OK ?

Could you tell them if there is any important notice ?

Thanks and regards,

Hideaki

over 1 year ago

0 Vaibhav Kumar over 1 year ago

TI__Mastermind 45976 points

Hello Hideaki-san,

Thank you very much for your patience.

So, I see this use case as no issue. Also I am assuming that CPLD here refers to Complex Programmable Logic Devices.

The flash which the customer is going to use for booting is going to use SPI boot which should not be a problem.

Does the QSPI CPLD behaves like a Flash? Or will there be a Quad SPI Communication between the SoC OSPI Controller and CPLD?

If either of the above is True, then there should be no problem.

Additionally you can share the following link with the customer for them to understand the SPI bootmode process if they have not already: https://www.ti.com/document-viewer/lit/html/SPRUIM2H#GUID-6BAAAC91-330A-4029-89FA-B6D55C12C0CE/TITLE-SPRUIM2INT_SPRUIJ7_INIT_00046

Regards,

Vaibhav

0 Hideaki Matsumoto over 1 year ago in reply to Vaibhav Kumar

TI__Genius 9140 points

Hi Vaibhav,

Thank you for providing answers and sorry for my delayed response. It was good to hear that this use case has no issue.

OSPI

CS0 : Single-SPI Flash at boot

CS1 : QSPI CPLD afer boot

However, I found some threads below which described that multiple devices are not recommeded but OK with enough test of signal integrity.

Is the above use case no problem ? because one is Single-SPI ?

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1231346/am6442-is-it-possible-to-connect-4-devices-to-ospi-using-4-css/4690225#4690225

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1108244/am6442-ospi-trace-routing-while-connecting-onto-two-devices/4112398#4112398

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1198568/am6412-ospi-with-2-devices/4520246#4520246

Thanks and regards,
Hideaki

0 Vaibhav Kumar over 1 year ago in reply to Hideaki Matsumoto

TI__Mastermind 45976 points

Hello Hideaki,

Hideaki Matsumoto said:
sorry for my delayed response

I appreciate your response.

So when it comes to interfacing two flash parts, our SysConfig tool does not currently supports multiple CS additions from OSPI point of view.

But supports CS additions from MCSPI point of view.

So you would need to do some code modifications in order to incorporate multiple CS lines/ multiple flash parts.

I would also like to know if the customer is going to have a common software image for both the flash parts or different software images for 2 flash parts.

Regards,

Vaibhav

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AM2434: OSPI is used as single-SPI with SPI Flash at boot and as quad-SPI with CPLD after boot