PIN ASSIGNMENTS
This is where you define which node (port) goes to which pin. All pin and device configuration information is stored in .ACF files.
You must set a pin to all ports declared in your
entity you do this by choosing Assign
-> Pin/Location/Chip.... The following should
appear:
figure 4.1
You then type the name of the port (located in
the entity definition in your source code) in the box beside Node Name. The Pin
Type box should be filled with the type of pin you are using.
With our example BLINK when you fill the Node Name with
"i" the Pin Type
box displays Input,
if you type "o" the Pin
Type box displays Output.
You now have to decide which pin you want to use
for this node. You do this by going to either PIN
Descriptions which lists all the pins on the FPGA and where
they go, or by going to the Altera documentation. For our example
we want the input to be a push button. The PIN Descriptions tells
me that the FLEX_PB1 is pin number 28 on the UP1 Board. So we
enter in 28 into the box beside Pin.
After you have typed in the pin number press the Add button. You
should see the following:
figure 4.2
You then have to create a pin for every other
port in your entity (i.e. repeat for the port "o" using
pin FLEX_DIGIT1_A). After you have completed all of your port
assignments press OK.
Mark Fedorak, Vera Casteel, Kris Pucci, Ron Smith - 1998