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Phy vs ttl mode?

DV
Prodigy 170 points

Could someone give me the run down on the differences between the USB host PHY mode vs. TTL mode?

I understand the may be silicon issues (ES2.X) that you have to watch out for?

  • 0
    TI__Guru 64490 points

    DV said:

    Could someone give me the run down on the differences between the USB host PHY mode vs. TTL mode?

    The TLL mode, or Transceiverless Link Logic, is meant to support a connection from say the OMAP35xx and another processor, or modem, that supports the TLL mode.   This allows connecting 2 USB interfaces together without using a transceiver on both ends.  This usually lowers the overall power of the solution, but obviously requires both ends to support it.  This would also be used to connect USB interfaces between devices that are on the same PCB.

    The PHY mode, is the typical mode which uses an external transceiver device.

     

    DV said:

    I understand the may be silicon issues (ES2.X) that you have to watch out for?

    Details regarding errata of the OMAP35xx silicon, including various versions, are detailed in SPRZ278.