I/O asignment using Problem

Altera_Forum · ‎05-23-2011

Error: Can't place output or bidirectional pin VGA_G[2] in input pin location A14

Error: Can't place output or bidirectional pin VGA_G[1] in input pin location B14

...etc

I found that the problem only happend in using bidirection or outputon CLK pins.

Is that means Clock pins can only use on input pins?

By the way, I also want to know if I using CLK as input data,Bad?

will Other pins do same problem?

Altera_Forum · ‎05-23-2011

Apparently you tried to use a dedicated input pin as output. There are only a few pins, that aren't suitable as outputs. As the hardware manual, pinout files and Pin Planner tool clarify, clock inputs can be still uitilzed as logic inputs.

Altera_Forum · ‎05-23-2011

HaHa, Thank you Guru!

I found a document PCG-01003[1].pdf at atera's website.

I got to change my design includes PCB layout.