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Tool/software:
Hi,
We designed with TMUXHS4212, and the current application involves two SATA controllers switching through a mux to connect to a hard drive, as shown in the diagram below.
However, we have encountered a problem. After switching the mux channel multiple times via the control SEL pin, we found that the hard drive cannot be detected.
After recording the signals through a SATA analyzer, we suspect that the mux may be hanging and unable to transmit signals.
After the problem occurs, we need to control the SEL pin and switch multiple times before the mux has a chance to return to normal.
I would like to ask if you have encountered a similar issue or if there are any ways you could assist us in debugging this. thanks!
Jeff
Jeff
I noticed in your schematic the two RSVD pins are left floating. But in the TMUXHS4212 datasheet, we required the two pins be tied to VCC. If you tie these two pins to VCC, then are you able to see the same issue?
Thanks
David
Hi David,
I'm not sure if these two pin hide in internal. Maybe need re-layout to re-connect these 2 pin to VCC.
What is the RSVD purpose for? Is there let it floating may cause this issue?
Thanks!
Jeff
Jeff
Since you leave RSVD pins floating and toggle SEL pin multiple time, then I am suspecting you are putting TMUXHS4212 into a TI Test Mode.
Thanks
David
Jeff
Unfortunately this is a TI internal test mode and I can't share its detail. But I would recommend to tie the RSVD pins to VCC so you will get into the test mode and see if it resolves the issue.
Thanks
David
Hi Daivd,
We found it have datasheet revise in 2022 for RSVD pin, may I know your team meet silimar issue?
Why change datashet remove floating description? Thanks!
Thanks!
Jeff
HI Jeff:
We found test mode issue after 1st revision of datasheet was released in 2020.
When RSVD1/2 are floating, 4212 will enter TI test mode after SEL toggleing 16 times.
Best
Brian