ADC12DJ3200EVM: SYNC signal is always low

Thakur Rohit Singh

Part Number: ADC12DJ3200EVM
Other Parts Discussed in Thread: ADC12DJ3200, LMK04828

Hi team

I am doing interoperability test of ADC12DJ3200 with my FPGA. My sampling sampling frequency 1250 Msps and i am using JMODE 2. My line rate is 5 Gbps and LMK04828 generates 125 Mhz clock for my FPGA. While programming the ADC card and reading the ADC register address0x208, i see that SYNC signal is always low and JESD link never up. I believe my pin mapping between ADC and FPGA is correct but i feel my SYNC signal is the culprit. What checks do you suggest for this scenario? Please advice.

Regards

Rohit

over 3 years ago

0 Neeraj Gill over 3 years ago

TI__Mastermind 20541 points

Hi Rohit,

Can you make sure the pin mapping of syncse signal from FPGA to ADC is correct?

You can check DC connection between for sync signal between FPGA and ADC by toggling the SYNC signal from FPGA high and low and read the status of register 0x208 bit 5 and see if it toggling as well?

Can you also make sure the IO voltage for FPGA pin and ADC are matching?

Regards,
Neeraj

0 Thakur Rohit Singh over 3 years ago in reply to Neeraj Gill

Prodigy 110 points

Hi Neeraj

My pin mapping from FPGA to ADC is correct. I tried toggling SYNC signal at FPGA from high to low and read the 0x208 bit 5, it never toggles. IO voltage for FPGA pin and ADC seems matching.

I tried reading JESD RX data outputs and they are reading BCBCBCBC. Also SYNC signal is always 1. Not sure if writing this bit to 0 is taking effect or not. As the next time i read this SYNC signal bit, it gives value 1 (same as default).

What do you think could be the issue here? Pin mappings w.rt to ADC and FPGA are correct to my knowledge.

Please suggest.

Regards

Rohit

0 Neeraj Gill over 3 years ago in reply to Thakur Rohit Singh

TI__Mastermind 20541 points

Hi Rohit,

Can you please provide the register writes you are performing to program the ADC?

Regards,

Neeraj.

0 Thakur Rohit Singh over 3 years ago in reply to Neeraj Gill

Prodigy 110 points

Hi Neeraj

Please find the file attached. Let me know if this file works for you to check the register writesregister_write.cfg. If not, please give me steps to get the register writes for you.

Regards

Rohit

0 Neeraj Gill over 3 years ago in reply to Thakur Rohit Singh

TI__Mastermind 20541 points

Hi Rohit,

Can you please send me the register writes you do the program the ADC sequence in which you do them. The file you sent me has bunch of register writes but I am not sure about the sequence in which the registers were written to program the ADC.

Regards,

Neeraj

+1 Thakur Rohit Singh over 3 years ago in reply to Neeraj Gill

Prodigy 110 points

Hi Neeraj

Thanks for your help. I think there was an issue with my FPGA board, tried with other board and SYNC signal and LINk is up as expected. I will get back to you if i face any other issue.

Regards

Rohit

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ADC12DJ3200EVM: SYNC signal is always low