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Altera_Forum's avatar
Altera_Forum
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15 years ago

problem with changing pin assignments

Hi, I almost finished my FPGA & board design . I wanted to add the possibilities to use CRC error check and dev_clr. the pins dedicated for those functions are already being used for othe...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

hi,

just want to share my finding: based on your info below:

Error: Can't place multiple pins assigned to pin location Pin_N5 (IOPAD_X10_Y0_N0)

Info: Pin Txd is assigned to pin location Pin_N5 (IOPAD_X10_Y0_N0)

Info: Pin ~ALTERA_NCEO~ is assigned to pin location Pin_N5 (IOPAD_X10_Y0_N0)

if you take a look at the pin-out table for the device you are using. Mine if EP4CGX15, you can find programming pin NCEO is using the pin_N5. In order to to make this pin dual purpose pin and free up this pin after the programming purpose. You can do the follow:

1. Open your Quartus Project. from the Quartus menu, Select Assingments -> Devices....

2. Click Device and pin Options... button

3. Select Dual-Purpose Pins from the Category column

4. Under Dual-purpose pins: column, selct the NCEO as Use as regular I/O

That's it. recompile your project, it should work this time. :):):)