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Adventurer
Adventurer
502 Views
Registered: ‎06-22-2018

Use USB3340 instead of USB3320 with Zynq7

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I find the MicroZed board has a USB3320 on it. And I find there is another newer USB3340 from Microchip. The major difference is USB3340 has built-in 1.8V regulator. Then we only need to route a 3.3V power rail to it. After more thinking, I find there may be some power sequence problem. Because FPAG may power on latter than the PHY chip. I have two questions now:

  1. Is it good to use the built-in regulator sit in the PHY chip, but not the same power rail with FPGA?
  2. I've noticed there is a reset pin both on the PHY chip and the Zynq side. So if Zynq can maintain the pin low when powering on, then the regulator in the PHY won't work at the same time, so it will be safe to use USB3340, right?

Any suggestion? Thanks.

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Moderator
Moderator
432 Views
Registered: ‎02-07-2018

HI @diverger 

 

Yes this can be done as both are ULPI interface, But we have not tested the same.

 

Thanks & Regards

Aravind

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Highlighted
Moderator
Moderator
433 Views
Registered: ‎02-07-2018

HI @diverger 

 

Yes this can be done as both are ULPI interface, But we have not tested the same.

 

Thanks & Regards

Aravind

View solution in original post