virtex2 user tutorial
ok,
It seems good to ask now about the expansion headers.
in the reference manual:
...."Various power supply voltages are available on the expansion connectors, 2.5V, 3.3V, and 5.0V, depending on the connector type.The expansion headers are positioned to prevent the installation of a ribbon cable connector across two of the expansion headers. Every second signal in the ribbon cable is a ground signal to provide the best signal integrity at the user’s target. The output of the over-voltage protection device follows the input voltage up to a diode drop below the VCC rail; at which time, the voltage is clamped. So with a VCC of 3.3V, the output clamps at -2.5V. This gives 500 mV of input switching margin for both LVTTL and LVCMOS3.3, which have a VIH of 2.0V minimum."
I am afraid of the red lines,
should i buy different types of ribbon cables for each voltage?
can i use ribbon cables used in our PCs? and the dual line male header?
the one mentioned in the ref. manual is from digikey and i don't have
a distributor in my region it is "S2012-30-ND".
sorry for long post,
thanks in advance.