LMK05028: Frequency and Phase Lock not Happening on Intel S10 SX SoC Dev Kit

Hi Musthafa,

Are you performing a runscript after you're making these updates? There's a runscript button that must be pressed if you make changes to the configuration.

Also, you're not using DPLL/APLL2 in either scenario, why isn't LOL_PLL2 (the APLL flagged) and the DPLL2 flagging is changing. That doesn't make sense since the whole DPLL/APLL2 loop is not being used the proper response would be for it to remain flagged in both cases.

Regards,

Amin

Is the frequency of XO 48 MHz flat or 48 MHz +100 ppm - that's the one that's used on the LMK05028 EVM.

Please try this .tcs file and let me know how it goes.

Load the .tcs file, press soft reset chip and then show the status readback tab. Including:

• LOFL/LOPL
• REF valid status
• DPLL REF select status

One configuration can accommodate both reference inputs since they can run at common TDC rate of 390.625 kHz. So in order to switch from being locked to IN1 to IN3, simply change the manual select register highlight it below. (for your reference, device can also be put in auto revertive mode and simply set which reference is choosing by the priority setting).

Regards,

Amin

Hi Amin,

Can you please explain to me what was the issue with my configuration?

Thanks,

Musthafa V

Hi Musthafa,

That would be hard to say...did you press the runscript button? I assume you did but just want to get confirmation.

Also, are you using the EVM to evaluate? The EVM XO should be 48.0048 MHz (48 MHz with 100 ppm error), that's the central frequency. If you were producing a configuration suited for a 48 MHz XO, it would be too far offset for the APLL to lock.

Regards,

Amin

Hi Amin,

I am using Intel S10 SX SoC Dev Kit. The XO input is 48MHz. I don't know the PPM value of the local oscillator.

Thanks,

Musthafa v

Hi Musthafa,

If you have a working configuration, I don't see the value in digging into what went wrong with your original issues.

You can use this current working configuration as the starting point and update any changes accordingly as needed.

If you have specific questions about how to update in terms of what the input should be for each step and/or at what point a runscript needs to be run we can address those.

Regards,

Amin

Hi Amin,

There is no specific questions from my side as of now. I will once again try to configure TI LMK from the scratch and see if it works as expected.

Thanks,

Musthafa V

Hi Musthafa,

It is not recommended to use from scratch. TICSpro only programs a certain amount of registers so if the starting configuration has issues, it may not be able to fix them.

So that's why it's always recommended to start with the EVM default configuration under "default configuration". Note, any working configuration will do the trick as starting point, so you can start with the configuration that worked from this thread.

Regards,

Amin