I use MaxPlus did a small project. choose device EPM7128, assign pins and systhesize is OK, load to EPM7128 and run. it functions ok. but I found there are some unused pin (I did not assign them ) also have signal output. Why? (I suppose that all un-assigned pin is in high impedence state) and how to sovle it?
Hi,
Since the pins are not used it cannot be forced to high impedance state. You may use sume dummy (read waste) logic and force these pins to high impedance.
Madhukar
I guess you use 7000S.
7000S/3000A is different with 7000AE
In MP2,if you choose 7000S/3000S,unused pin is an output of a internal node. Perhaps is low,perhaps is high. If you hope a tri output,you should define this pin as an input . If you want to get a 1 or 0,you also can define it in your design.
if you choose 7000AE,unused pin is driven to the GND.
In QuartusII,you can choose GND/Vcc/Tri/internal output/ for unused pin.