LMK5B12212: Multiple LMK5B12212 synchronization

Hi Eddie, 

Can you provide the customer's .tcs configuration file? For this kind of use case, I would recommend operating the slave LMK5B devices in zero-delay mode to ensure that the output clocks have phase determinism with respect to the input clocks. 

Hi Connor, 

Confirm customer with below clock tree, 

Master： All output 156.25 MHz

Slave1 ：All output 312.5 MHz

Slave2 ：Only8_9_10_11_OUTPUT=156.25 MHz ,  Other_OUTPUT=312.5 MHz

tcs file attached for different LMK5B, 

master.tcsslave1.tcsslave2.tcs

Customer run the tcs files and slave output doesn't synchronized with IN1 ( from master output)

Would you help check check customer setting? we can go through e-mail if you need customer schematic for reference. 

Thanks & Regards

Eddie

Hi Eddie, 

Sorry for the delayed response here. Tomorrow I'll test out the .tcs file that you sent on my setup and see if I can replicate the same behavior on my end. 

Hi Eddie, 

I reviewed the .tcs configuration files and it seems like there was an issue with the configuration for DPLL1. I re-ran the script in step 10 of the start page and now the settings look correct to me. Can you try using the updated configs I've attached here and see if there's any improvement? 

slave1 - modified.tcs

slave2 - modified.tcs

Hi Connor,

Customer still not able to get clock synchronized with tcs file you provided?

Below is are waveform and status page snapshot, is there something with HW setting?

Thanks & Reagrds

Eddie

Hi Eddie, 

Since REF1 is not being validated, there could be some issue with the input clock or reference validation settings. Could you ask the customer to try following the debug steps outlined in this application note? https://www.ti.com/lit/an/snaa421/snaa421.pdf Assuming the output frequency is correct then the APLL should be locked, so they could try starting from section 2.3 and onward.