In a similar vein, I am trying to understand what ends up in the Assignment Editor after a pin assignment. In my case, I'm using Quartus II 13.1 Web Edition with the DE0-Nano. In the Pin Planner, I assigned the 50MHz clock, resulting in the following:
Node Name: CLK_50
Direction: Input
Location: PIN_R8
In the Assignment Editor, this shows up as:
Status: ? 'To' name unrecognized
To: CLK_50 (
with a question mark icon)
Assignment Name: Location
Value: PIN_R8
Entity: (
grayed out)
However, there's another option in the Assignment Editor for "Assignment Name":
external pin connection. In this case, I can enter the following:
Status: Ok
To: CLK_50
Assignment Name: External Pin Connection
Value: R8
Entity: (
my top-level entity name)
So which is more correct? It certainly seems like the "External Pin Connection" would be the most accurate, but I cannot seem to find any documentation about when that should be used. And it doesn't quite seem to be associated to the Pin Planner. So now I am just confused.
