Newbie question -fanout of iopins in fpga

[vivek]

what is the fanout of the IOpins in Virtex2 to devices

thanks and regards
vivek

 

[Hal Murray]

what is the fanout of the IOpins in Virtex2 to devices

The details are in the data sheet. It depends upon which
IO standard you are using.

I haven't seen the term "fanout" in data sheets for a long time.
It doesn't really make much sense with modern logic.

CMOS has almost 0 load current so you can drive hundreds of
loads if you don't care about speed. The data sheet will
give you the switching times for a specified load capacitance.
If you have more capacitance it takes longer.

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[Mario Trams]

Hal Murray wrote:

what is the fanout of the IOpins in Virtex2 to devices

The details are in the data sheet. It depends upon which
IO standard you are using.

I haven't seen the term "fanout" in data sheets for a long time.
It doesn't really make much sense with modern logic.

CMOS has almost 0 load current so you can drive hundreds of
loads if you don't care about speed. The data sheet will
give you the switching times for a specified load capacitance.
If you have more capacitance it takes longer.

Though, you have to care for input rise and fall time requirements
of the attached receivers.

Regards,
Mario