Hi,
I own a XEM3001v2 board and I am thinking about changing the I/O standards it uses to communicate to external devices. By default it uses LVCMOS25, and I would like to change that to LVCMOS33. I read on the Xilinx user guide (and shown by this forum post:
http://forums.xilinx.com/xlnx/board/message?board.id=Spartan&message.id=1031&query.id=49835#M1031
) that this can be done by modifying the UCF file as follows:
NET “net_name” LOC = “B4” | IOSTANDARD = LVCMOS33;
and since I am using JP2, which is connected to the YBUS, i figure I will have to do something like:
NET “ybus” LOC = “P45” | IOSTANDARD = LVCMOS33
However, what I am not sure about is that if I should do the same for the following UCF definitions:
NET “hi_in” LOC = “P79”;
NET “hi_in” LOC = “P57”;
NET “hi_in” LOC = “P58”;
NET “hi_in” LOC = “P78”;
.
.
.
Or it would be OK for these to keep using LVCMOS25. If anyone has any idea, please share.
Thanks.