Re: Not enough pins on EXPAND-B port for lab??

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: : : : : : We have only 42 pins available on the EXPAND-B port. : : : : However in this lab, we need 23 address pins, 16 data : : : : pins, and 8 signalling pins which amounts to 47 : : : : signals (neglecting clock and reset). : : : : Am I missing something here? : : : There are actually 49 pins available. The pins marked DI1/99 : : : and so on are dual-use pins. During configuration they are : : : used to download the configuration bitstream, but after : : : configuration of the FPGA they can be used as normal I/Os -- : : : in the case above, I/O pin #99 for example. This is just : : : enough pins to do the lab. : : : Vaughn : : Hmmm... : : Lessee. : : 42 - I/O pins : : 4 - DI pins : : 3 - Clear, CLK, OE pins : : we need 47 pins IO, and Clock and reset. : : Now, unless the OE pin is also able to be used as IO, this isnt possible. : : Also, I tried assigning the DI pin as an output pin, and it complained. I guess it should be bi-directional type? : : Jim : : I don't think you can use the OE pin for general I/O, but I'm : not sure. Give it a shot. : Also, 'DI' stands for 'dedicated input', so you will have to use : these pins for input-only signals.

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