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TUSB1210

gge7

Hello

 

Thank you all for taking the time to read this.  I had a question on the Zedboard's use of the TUSB1210.  I know the Errata mentions the issue with the timing.  It seems now that the issue has been resolved by TI as they state the timing is within the Zynq timing requirements so that isn't an issue now.  Also it has worked for the Zedboard.

But I also saw another potential issue according to the TI TUSB1210 datasheet it states the VBAT voltage should be applied before the VDDIO voltage.  The VBAT on the Zedboard is connected to 3.3V and the VDDIO is connected to the 1.8V.  Looking at the power supply sequencing on the Zedboard the 1.8V comes up first than the 3.3V which follows what the Zynq datasheet outlines.  Unfortunately according to the TI TUSB1210 datasheet there is a diode between VBAT, 3.3V and VDDIO, 1.8V and if 1.8V comes up first there should be a problem.  Now obviously this doesn't seem to be an issue with the Zedboard but why?

Also the concern with switching to the SMSC part is driver compatablilty .  Is there any driver changes between using the TI part and the SMSC part or is that all transparent on the Zynq end?  I don't know if the ULPI interface is a standard and all parts must meet it.

 

Thank you all for your help.

Gary

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    Hi Gary,

    Thanks for pinging me again, here are our thoughts. If they were all power pins, then if you can hit all pins at the same time with power it would be okay. Which we believe to be done by the Power Sequencing Reset Circuit in the Zedboard. However this is just an assumption. I am going to suggest to get a more sure answer by asking this same question over at Digilent as they were prevalent in the design process of the Zedboard. Here is their website https://forum.digilentinc.com/

    Please post a link to your post for other to view as well! Thank you Gary.

    --Josh

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    Hi Gary,

    Thanks for pinging me again, here are our thoughts. If they were all power pins, then if you can hit all pins at the same time with power it would be okay. Which we believe to be done by the Power Sequencing Reset Circuit in the Zedboard. However this is just an assumption. I am going to suggest to get a more sure answer by asking this same question over at Digilent as they were prevalent in the design process of the Zedboard. Here is their website https://forum.digilentinc.com/

    Please post a link to your post for other to view as well! Thank you Gary.

    --Josh

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