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Why using ad_iobuf and how?

Question asked by NilsMinor on Aug 3, 2018
Latest reply on Aug 14, 2018 by NilsMinor



while trying to understand the daq2 design with zc706 I need some help in understanding the gpis signals.


ADI always defines wires like this :

   wire [63:0] gpio_i;

   wire [63:0] gpio_o;

   wire [63:0] gpio_t;


and then put it into ad_iobuf like this:



Why are you doing this, what the goal of the ad_iobuf ?

Why do you insatiate 64 wires but only 8 of them are used?

And what about the numbers behind the signals? where do they come from? Could they be any number between 63 and 0 with corresponding gpio_x [number] ?