hi.i have altera de2-70 board.quartus always eroring SW[7] on fitter .


Error: Can't place multiple pins assigned to pin location Pin_AD25 (IOC_X95_Y2_N1)
Info: Pin SW[7] is assigned to pin location Pin_AD25 (IOC_X95_Y2_N1)
Info: Pin ~LVDS195p/nCEO~ is assigned to pin location Pin_AD25 (IOC_X95_Y2_N1)
Info: Fitter preparation operations ending: elapsed time is 00:00:00
Error: Can't fit design in device
Error: Quartus II Fitter was unsuccessful. 2 errors, 0 warnings
Error: Peak virtual memory: 237 megabytes
Error: Processing ended: Tue Jun 16 21:28:52 2009
Error: Elapsed time: 00:00:06
Error: Total CPU time (on all processors): 00:00:04
Error: Quartus II Full Compilation was unsuccessful. 4 errors, 48 warnings

[sanmao]

Dear Speak48,

When using iSW[7] of the DE2-70 board there is a problem with PIN_AD25 that is default assigned for two purposes. Messages look similar to:

Info: Pin ~LVDS195p/nCEO~ is reserved at location AD25
Error: Can't place pins assigned to pin location Pin_AD25 (IOC_X95_Y2_N1)
Info: Pin iSW[7] is assigned to pin location Pin_AD25 (IOC_X95_Y2_N1)
Steps:

• In Quartus-II select menu Assignments>Device...
• Select button "Device and Pin Options..."
• Select the tab "Dual-Purpose Pins"
• Under the list of "Dual-purpose pins:" change the "Value" property of nCEO to "Use as regular I/O".
• Click OK

Good Luck!

Edit: removed original screenshots...

[thepancake]

i think sanmao has the issue explained well.

however are you trying to embed images here? i get a prompt to put in my password for a .tw site...

[sanmao]

Dear thepancake,

thanks for pointing me out to this! Apparently images are not uploaded to http://www.alterforum.com . So I removed the unaccessable links to obvious screenshots.

[speak48]

thank you brother!

[nwhitehead]

SanMao - thanks for the clear explanation. I had this problem and couldn't figure out what the heck was going on until I read your post, found through a google search.