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AM5726: Pinout question

Gregory Duperon
Expert 7470 points
Part Number: AM5726
Other Parts Discussed in Thread: AM5746

I have a customer with a design and processor peripheral pin-out allocation done with the ability to drop-in a high-security, secure boot version of the AM5746/8 "HS" but, for now, the board will be populated with only AM5726/8 "GP" devices. Are there any special things they need to add in anticipation of dropping in an HS device? For example, I think there is a "E-FUSE" pin (ball K14) for the HS device. How should this pin be strapped externally? Are there other pins they would need to prepare for a security key writing?

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    TI__Guru 52285 points

    Powering the VPP pin (K14) is all that is required additionally between GP and HS devices.  It is recommended to only power VPP when programming the internal EFUSE registers, otherwise it should be powered off.  Recommended having the ability to enable VPP (after boot) and then disabling after EFUSE programming is completed.