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DS80PCI102: No EEPROM Condition with Master mode

Kuramochi Tadahiko
Guru 28715 points

Part Number: DS80PCI102

Hi,

My customer is considering to use DS80PCI102.

I received below question from then.

How are resisters set when the device turns on with master mode if there is no EEPROM?

Is it default condition or ALL=0?

Best Regards,

Kuramochi

  • 0
    TI__Mastermind 29655 points
    Hi Kuramochi-san,

    When the DS80PCI102 is operated in Master Mode and there is no EEPROM (or the EEPROM is not correctly programmed), the DS80PCI102 will enter an unknown state, and the DONE# pin will not go low because EEPROM loading will not complete.

    The DS80PCI102 should still stay in its default startup condition, but registers will not be accessible until the EEPROM read is complete.

    Thanks,

    Michael
  • 0 in reply to Michael Lu (Santa Clara)
    Guru 28715 points

    Michael-san,

    Thank you for your help.
    I have an additional question.

    If all address of EEPROM are resisterdd FFh(unwritten condition), the DS80PCI102 will stay in its default startup condition.
    Because the file format is not appropriate.
    Is my understanding correct?

    Best Regards,
    Kuramochi

  • 0 in reply to Kuramochi Tadahiko
    TI__Mastermind 29655 points

    Hi Kuramochi-san,

    This depends.

    The address map header indicates the starting byte of the EEPROM data for a particular repeater device. The repeater device the EEPROM data corresponds to is based on the location of the Address Map Header. For example, Address Map Header #0, located in EEPROM Byte 3, corresponds to SMBus 7-bit Redriver Address 0x58, or 8-bit Address 0xB0.

    If the address map header in the EEPROM is set to 0xFF, the DS80PCI102 with the corresponding SMBus address will search for EEPROM data starting from 0xFF. Assuming that there is no valid EEPROM data at location 0xFF, the EEPROM will not load correctly.

    Please let me know if this explanation is unclear.

    Regards,

    Michael