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There are a few interfaces we're not using in our design. Is there a list of what to do with unused inputs or I/O lines on SDIO, MII, S/PDIF, or USB interfaces? Are they internally pulled to safe / idle states, or do they need to be manually strapped? If they need to be tied, are resistors required or can we connect directly to VIO/GND? I realize this may depend on the signal / interface signal, but a list of what to do with unused signals would be very helpful.
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Hello SeFe_4295646
I can't find a document to describe the unused I/O interface, since they are standard communication interface, normally,
we recommend:
- Input, need a pull-up resistance to VIO.
- Output, can be floating.
- I/O , we can configure them after chip reset .
if there have questions , please correct me, thanks.
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Note that I found a similar thread here: https://community.cypress.com/message/183272#183272
Maybe the Applications Team can confirm this is the correct approach for the unused pins.
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Ya seems that would apply, thanks for the find, didn't come up on my searches. Will watch to see if there's confirmation.
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Hello SeFe_4295646
I can't find a document to describe the unused I/O interface, since they are standard communication interface, normally,
we recommend:
- Input, need a pull-up resistance to VIO.
- Output, can be floating.
- I/O , we can configure them after chip reset .
if there have questions , please correct me, thanks.