UltraZed-EV SATA Drive Power Sequence

Question

I want to add an external SATA 3 SSD drive to the UltraZed-EV Carrier Card interface and the drive uses a separate power source than the Carrier Card. Should I power up the carrier card first and then the drive? That would seem like the correct sequence. I don't see a sequence specifically mentioned in the documentation (UltraZed SATA Performance Test Tutorial) but it seems to imply that the drive is powered first. Just wanted to check -- hate to have any smoke.

Thanks,

Ralph

ctammann · Accepted Answer

Hey Ralph, yes I would recommend powering up the UltraZed EV first. If the drive powers up first and sends data over the I/O before the Ultrascale is configured it "could" damage it. I'm not saying it definitely will, but safest bet is to power the EV system, then power the drive

Thanks
Chris

narrucmot · Answer

Hi Ralph,

The PMIC programming and telemetry reading app that Chris mentioned in his webinar today will be released as part of the upcoming PetaLinux 2020.1 BSP releases for the Ultra96-V2 and UltraZed SOMs. It will also be public via github at the same time. Stay tuned!

--Tom

narrucmot · Answer

The app will also work in PetaLinux 2019.2 if one wishes to back-port it. --Tom

UltraZed-EV SATA Drive Power Sequence

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