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TI Home » TI E2E Community » Support Forums » Interface » Consumer & Computing » Consumer & Computing Forum » 1394 bus initialization problems
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1394 bus initialization problems

This question is answered
Robert Lindner
Posted by Robert Lindner
on May 31 2011 13:50 PM
Intellectual350 points

We have a new design with a TSB81BA3 (and TSB82AA2) connected to a Unibrain 1394 card in an XP PC with their analyzer software. Sometimes they synchronize at reset, many times they don't when we power-up our side (without making any changes). When they synchronize, the connection seems pretty robust (does not drop out). Can anyone suggest an analyzer/scope setup that will allow me to capture the B-mode tone waveform for analysis?

TSB81BA3 bus reset
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  • ELIAS VILLEGAS
    Posted by ELIAS VILLEGAS
    on Jul 12 2011 10:01 AM
    Verified Answer
    Verified by Robert Lindner
    Mastermind23035 points

    Hello Robert,

    Please connect TPB1+/- and TPB2+/- to ground.

    Regards.

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  • Robert Lindner
    Posted by Robert Lindner
    on Jul 18 2011 08:44 AM
    Verified Answer
    Verified by Robert Lindner
    Intellectual350 points

    Elias,

    I implemented your suggestion but it has not resulted in any change in our situation. We still need to hold TPB bias voltage sense node to ground while cycling power (more than once, typically) to restore sync/communication. We are considering replacing the PHY device itself in case something has affected it.

    Robert L

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