This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hello,
My customer have some questions about SYSREF for ADS54J54.
[Background]
They want to use one-shot SYSREF.
It is written as follows in D/S.
P.28 : ADS54J54 device requires a minimum of 3 SYSREF pulses to complete the synchronization phase. (D/S P.28)
P.32 : Step7 : Wait for two SYSREF pulses
[Q1]
How many SYSREF pulses does it require, 2 or 3 ?
Does three SYSREF pulse mean "skip one, use all pulses" setting in SYSREF_JESD_MODE_AB/CD, or not ?
[Q2]
Please tell me the input timing in the JESD204B Interface Initialization Sequence if it require three SYSREF pulses.
Best Regards,
Hiroshi Katsunaga
.
Hiroshi,
In step 7, after the JESD block is taken out of the initialization step (after 2 SYSREF pulses occur) a third SYSREF is then required to synchronize the JESD block with the other logic blocks in the device.
For "SYSREF JESD MODE AB/CD" register value, I would suggest using the default option of skip one SYSREF, then use all.
Regards,
Jim