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XIO2001 INTA-D

Shu-Cheng LIN
Guru 11785 points
Other Parts Discussed in Thread: XIO2001

Hi Sirs,

Sorry to bother you.

We have use XIO2001 to connect EXAR XR17D158IV

EXAR didn't have INTA-D line could connected XIO2001, so could we float XIO2001 INTA-D??

For your experience, have any risk to use XIO2001 and  XR17D158IV??

Thanks for your reply

  • 0
    Guru 316690 points

    The PCI specification say about the INTx# pins:

    Interrupts on PCI are optional and defined as "level sensitive," asserted low (negative true), using open drain output drivers.

    So an interrupt signal that is never asserted behaves exactly the same as a signal that is not connected to anything.

    Whether connected or not, the INTx# pins require pull-up resistors (section 4.3.3 of the spec, and referred to by the XIO2001 datasheet).

    (And what possible reason is there for not connecting the XR17D158's INTA# pin? This is likely to break any software that expects the interrupt to work.)