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Inquiries about TUSB7320

Inquiries about TUSB7320

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Hirokazu Takahashi
Posted by
on Jul 26 2012 01:37 AM
Intellectual870 points
Dear Support team
 
I'm a FAE in TIJ Kanazawa Sales office.
I have some technical inquiries regarding TUSB7320 from my customer.
Could you please replay about the following questions?
 
Q1. If they would use only 1 port USB, is the external EEPROM needed?
Q2. If they don't use AUX_DET, GPIO pins, is it necessary to connect with the pull down or up resister?
Q3. Do you have any application note regarding bypass capacitor for power supply lines?
       or any recommendation?
Q4. Are there any TUSB7320 driver for Linux or ITRON?
       If there are something, Could you provide them to customer?
 
Best regards,
Hiro Takahashi
USB3.0
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All Replies
  • ELIAS VILLEGAS
    Posted by
    on Jul 26 2012 16:49 PM
    Mastermind22985 points

    We are reviewing the info and we will reply soon.

    Regards.

    Report Abuse
  • ELIAS VILLEGAS
    Posted by
    on Jul 30 2012 11:28 AM
    Mastermind22985 points

    Hello Takahashi-san,

    Q1. External EEPROM is only optional, the TUSB7320 can work without eeprom, the unused port can be left unconnected, also it can be disabled by software using the PORT2_DIS bit on the USB Control Register at offset E0h.

    Q2. If V_AUX is not present in the system, then terminal AUX_DET should be connected to ground.

    Q3. You can go to the Board Design Guidelines for reference. (http://www.ti.com/lit/ug/sllu149a/sllu149a.pdf)

    Q4. The driver is supported by the Linux community, see the attached document for contact information.

    8168.Linux-xHCI-HCD.pdf

    Regards.

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  • Hirokazu Takahashi
    Posted by
    on Jul 30 2012 20:34 PM
    Intellectual870 points
    Hello VILLEGAS-san
     
    I would like to have more information regarding Q4.
    TI cannnot have any suggestions regarding USB driver for TUSB7320 with ITRON.
    Is It correct?
     
    Best regards,
    Hiro Takahashi
    Report Abuse
  • ELIAS VILLEGAS
    Posted by
    on Jul 31 2012 09:10 AM
    Mastermind22985 points

    Correct,

    the Linux Community is who support the driver for the xHCI and we have tested with our host with no issues.

    Regards.

    Report Abuse
  • Hirokazu Takahashi
    Posted by
    on Aug 01 2012 03:56 AM
    Intellectual870 points
    VILLEGAS-san
     
    Thanks for your reply and support.
    My customer asked about the state of USB input pins, USB_SSRXP_DNx and USB_SSRXN_DNx.
    If they plan to use only one USB port, should input pins of the other port be pull up or down?
     
    Best regards,
    Hiro Takahashi
     
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  • ELIAS VILLEGAS
    Posted by
    on Aug 01 2012 10:13 AM
    Mastermind22985 points

    Hello Takahashi-san,

    The unused super speed terminals must be left floating.

    Regards.

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  • Hirokazu Takahashi
    Posted by
    on Aug 05 2012 23:04 PM
    Intellectual870 points
    Dear VILLEGAS-san
     
    I have another question regarding TUSB7320/TUSB7340 EVM User's Guide from customer.
    In the page 15, TUSB7320 DEMO EVM REVB schematics, USB super high speed lines are connected to J1 and J4 as following.
     
    J1 and J4
    SSRXN (5)  ---- USB_SSRXP_DNx
    SSRXP (6)  ---- USB_SSRXN_DNx
    SSTXN (8)  ---- IND_DS_TXPx
    SSTXP (10) ---- IND_DS_TXNx
     
    So, the positive and negative differencial lines seem to be switched and connected to J1 and J4.
    Is it correct conection?
     
    Best Regards,
    Hiro Takahashi
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  • ELIAS VILLEGAS
    Posted by
    on Aug 06 2012 10:00 AM
    Mastermind22985 points

    Hello Takahashi-san,

    USB 3.0 allow the SS signals to be swapped, so probably it was done for routing purposes on the EVM, customer may or mat not swat the SS signals.

    Regards.

    Report Abuse
  • Hirokazu Takahashi
    Posted by
    on Aug 06 2012 20:01 PM
    Intellectual870 points
    Dear VILLEGAS-san
     
    Thanks for your quick reply and support.
    I'm sorry, but other questions were sent from customer.
     
    Q1. Regarding "OVERCURn#" pin
        They would like to confirm the voltage for "OVERCURn#".
        Is it 3.3V input?
        Is its reference specification "11.4 3.3-V I/O ELECTRICAL CHARACTERISTICS" in page107 of datasheet?
     
    Q2. Regarding bypass capacitor for power line
       In page 9 of TUSB73x0 Board Design and Layout Guidelines, 0.01uF bypass capacitor is recommended also.
       Is it better to put both 0.1uF and 0.01uF as bypass capacitors for each power pins?
     
    Best regards,
    Hirokazu Takahashi 
    Report Abuse
  • ELIAS VILLEGAS
    Posted by
    on Aug 07 2012 14:03 PM
    Mastermind22985 points

    Hello Takahashi-san

    Q1. Correct, /OVERCUR# terminals are 3.3V I/O, table 11.4

    Q2. In general for power filtering, yes, it is better to place a 0.1uF along with a 0.01uF.

    Regards

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