XIO2001: Drive strength of the PCI Bus at 33MHz in XIO2001 bridge chip.

Dhruvil Patel

Part Number: XIO2001

Hello,

We are using the XIO2001 bridge chip in our product. We have used 14.532K Ohms resistor between the pins as asked in the datasheet. I am facing EMI/EMC issues with this, and I want to reduce the drive strength of the PCI bus, Is there a way to do so, if yes can you help us out how to do that?

Thanks and Regards,

Dhruvil Patel

over 7 years ago

0 Roberto Diaz over 7 years ago

TI__Genius 11255 points

Hello Dhruvil,

Could you please send us your schematic?

Regards,
Roberto

0 Dhruvil Patel over 7 years ago in reply to Roberto Diaz

Prodigy 110 points

Hi,

I am forwarding you the schematics for our board.Design.pdf

0 Dennis Wu over 7 years ago in reply to Dhruvil Patel

TI__Intellectual 2915 points

Hi,

Thank you for the schematic. The schematic looks good and is following XIO2001 Evaluation Module User’s Guide.

When measuring circuit board EMI, the ferrite bead is a superior solution. Does the customer use ferrite bead?

The use of series resistors on the seven PCI bus clocks should be considered to reduce circuit board EMI. Please see more details to EMI considerations on the page 18 on SCPA045D

All mounting standoffs should be connected to earth ground (chassis ground). This provides proper grounding for EMI purposes.

For the EMI reduction, below are a few tips:

• Utilize flat cable Ferrite core (used for FPC/FFC cable)

• Utilize EMI shielding foils and film

Regards,
Dennis

0 Dennis Wu over 7 years ago in reply to Dennis Wu

TI__Intellectual 2915 points

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XIO2001: Drive strength of the PCI Bus at 33MHz in XIO2001 bridge chip.