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XIO2001: XIO2001　Errata　Qustion

Masa_0000
Intellectual 885 points
Part Number: XIO2001
Hi everybody!
Please let me know if you have any information.
It is a question about Errata information of XIO2001ZGU.
”5 Internal pull-down resistor on EXT_ARB_EN and CLKRUN_EN does not work.”
Questions:
1: When the CLKRUN_EN Pin is open, what is happens ?
2: When the EXT_ARB_EN Pin is open, what is happens ?
3: Has Errata been Fixed? If it has been Fixed, please indicate the timing and how to identify.
　　Example:  
　　　　production ： 2017~ 
　　　　Markings　(or LOT No.)~
4: How to check the effect of this Errata How can I do it?
Best regards 
Shing
  • 0
    TI__Genius 10250 points
    Hello,

    The errata is still valid. If CLKRUN_EN or EXT_ARB_EN is left open, then it will float and may be read as low or high, and the status can change during operation. An external pull-down or pull-up is needed.

    Regards,
    Yaser
  • 0
    Expert 1950 points

    Hi Sing,

    I had the same question a few days ago

    To your questions:

    1: My observation is that the CLKRUN_EN pin floats to ground. But in theory, it could also float to any other voltage level. Each time the XIO2001 reads this pin as "1", the secondary clock will stop during the pauses between PCI traffic. If the PCI devices on the XIO's PCI-Bus are target-only, this will not harm as long as they do not rely on a continiously running PCI-Clock for local operation (e.g. supervising an input and generating an interrupt if it gets high).

    2: My observation is that the EXT_ARB_EN pin floats to ground. But in theory, it could also float to any other voltage level. Each time the XIO2001 reads this pin as "1", the internal arbiter will stop working and any subsequent access to the PCI-Bus will fail.

    3: As Yaser wrote, no fix.

    4: Pull CLKRUN_EN high and see that the PCI-Clock stops. Remove the Pullup, and the PCI-Clock will start running again.
         Pull EXT_ARB_EN high and see that it is no longer possible to access PCI-Devices on the XIO's PCI-Bus. Remove the Pullup and see that your PCI-Devices are back.

    Regards, Niels