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Altera_Forum's avatar
Altera_Forum
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15 years ago

error with pin assignment

Hi, i am trying to do a pin assignment but by compile i get this Error Message:

"Error: Can't place multiple 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)

Info: Pin ~LVDS195p/nCEO~ is assigned to pin location Pin_AD25 (IOC_X95_Y2_N1)

Error: Can't fit design in device"

i don't know where thie Pin LVDS195p/nCEO is defined

could someone help me?

Thanks

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    Go to the Assignments menu > Device

    Click on the "Device and Pin Options" button

    Go to the "Dual-Purpose Pins" tab

    Double click on nCEO

    Select "Use as regular I/O"

    By default nCEO is used as a programming pin (to chain several FPGAs during configuration). You need to tell Quartus that you want to use this pin as an I/O instead.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    --- Quote Start ---

    Go to the Assignments menu > Device

    Click on the "Device and Pin Options" button

    Go to the "Dual-Purpose Pins" tab

    Double click on nCEO

    Select "Use as regular I/O"

    By default nCEO is used as a programming pin (to chain several FPGAs during configuration). You need to tell Quartus that you want to use this pin as an I/O instead.

    --- Quote End ---

    thank you for your answer
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    Probably you defined an I/O differential standard (i.e.LVDS) on another pin which would need AD25 as its complementary.

    Check pin assignment or in assignement editor for any reference to AD25 and to its complementary pin (LVDS195n, refer to your device datasheet)

    Cris