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                                              Specification Update
AMD GeodeTM
NX DB1500 Development Board
Document Revision History
            Date                Revision                                         Changes
     September 2004                 A      Initial version

         January 2005               B      Added Errata item #4



The AMD GeodeTM NX DB1500 Development Board may contain design defects or errors known as errata that
cause its behavior to differ from the published specification. Characterized Board Errata are documented in this
Specification Update.
As needed, this Specification Update provides a summary table and more detailed descriptions of permanent
Specification Changes made to the published product documentation.
This Specification Update also provides a summary table and more detailed descriptions of known Documentation
Errata.
To establish Specification Update information, AMD tests to errata, specification changes, and current
documentation. Specification Update information supersedes current published documentation.
            NOTE: BIOS errata is outlined in the release notes of each code release. Please see the
                  specific code release for your BIOS version for more information.


Board Errata Summary Table
The following table lists the status of all characterized board errata. A blank field under a particular Revision implies
that the listed erratum does not apply to that version of the development board.

Errata No. Revision                                                      Errata
               1.1      1.2
     1          X             Start-up failure at power-up.
     2          X             Start-up failure of the on-board 2.5V regulator.
     3          X             Failure to resume from S3 (Suspend to RAM).
     4          X       X     Over-voltage condition on processor SOFTVID output pins.


Board Errata
1. Start-up failure at power-up.
     Description
     The problem surfaces as a failure of the system to start up at power-on. No video is present. A system reset
     typically clears the error.




                                                                                       32328B
                                                                                        Publication# 32328BRev: B Amendment/0
                                                                                       January 2005 January 2005
                                                                                        Issue Date:
                               S P E C I F I C A T I O N           U P D A T E

    The VIA KM400A S2K compensation resistor (R348) on the board was originally set at 60.2 ohms, 1%
    tolerance. In response to an errata released from VIA Technologies on the KM400A, the value has been
    changed to 49.9 ohms, 1% tolerance.

    Affected Revisions
    1.1

    Workaround
    Shipped boards should already have this rework implemented. Design revision 1.2 reflects this change.

    Status
    Fixed

2. Start-up failure of the on-board 2.5V regulator.
    Description
    Symptom will be failure of system to start up at any time. A system reset will have no impact. Power cycling
    may correct the issue. This problem was fixed by adding a pass FET to the output of L1 to prevent voltage
    backfeed from other circuits on the voltage rail. The pre-biasing of the regulator output causes startup failure.

    Affected Revisions
    1.1

    Workaround
    Shipped boards should already have this rework implemented. Design revision 1.2 reflects this change.

    Status
    Fixed

3. Failure to resume from S3 (Suspend to RAM).
    Description
    The board hangs during Resume from S3 state. This problem was fixed by correcting a pull-up resistor that
    was tied to the wrong power rail: disconnect R54 from net VCC_5VSUS and connect to net VCC_5V.

    Affected Revisions
    1.1

    Workaround
    Shipped boards should already have this rework implemented. Design revision 1.2 reflects this change.

    Status
    Fixed

4. Over-voltage condition on processor SOFTVID output pins.
    Description
    A schematic error allows an over-voltage condition to exist at the SOFTVID outputs of the processor. This
    condition may damage the SOFTWVID outputs of the processor over time and result in a malfunction of the
    on-board regulator that generates the processor core voltage. This malfunction may prevent the sytem from
    operating normally.

    Affected Revisions
    1.1, 1.2


2                                                     32328B            AMD GeodeTM NX DB1500 Development Board
                               S P E C I F I C A T I O N         U P D A T E

    Workaround
    None at this time. Revision 1.3 schematics correct this issue.

    Status
    Not Fixed




AMD GeodeTM NX DB1500 Development Board             32328B                     3
                                         S P E C I F I C A T I O N                      U P D A T E



                                      

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