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Altera_Forum's avatar
Altera_Forum
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17 years ago

SRAM Connection problems in NiosII(Cyclone III)

Hi all,

I am working on a project to port NiosII softcore processor, SRAM connected via a tristate bridge and a custom MAC into Cyclone III(EP3C25F324C8). I used Altera's SOPC builder to have it working but the problem i faced was in the pin assignment where ALTERA assigns its internal signals to the pins dedicated to SRAM's pins and i am not able to assign two of my SRAM's data pins.

I see this error on compilation.

Error: Can't place multiple pins assigned to pin location Pin_D1 (IOPAD_X0_Y27_N7)

Info: Pin data_to_and_from_the_sram_0[1] is assigned to pin location Pin_D1 (IOPAD_X0_Y27_N7)

Info: Pin ~ALTERA_ASDO_DATA1~ is assigned to pin location Pin_D1 (IOPAD_X0_Y27_N7)

but my datasheet holds the pin D1 for sram_dq1.

Can anyone help me out in this issue.

Many Thanks to all,

Jude.

4 Replies

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

    You need to change the device settings in Quartus, to be able to use the DATA1 programming pin as a regular I/O after configuration.

  • Altera_Forum's avatar
    Altera_Forum
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    17 years ago

    Thank u so much... But can u just let me know what all modifications should i make in the device settings...

  • Altera_Forum's avatar
    Altera_Forum
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    17 years ago

    Go to the Assignments menu, click on Device.

    Then click on the "Device and pin Options" button, go to the "Dual-Purpose Pins" tab, select "Data[1]/ASDO" and change the value to "Use as a regular I/O".
  • Altera_Forum's avatar
    Altera_Forum
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    17 years ago

    It worked!!!... Thank You so much...I would be very happy if u can also help me in solving this issue...

    After generation of the code built in SOPC and programming the device with the sof file, when i go into Nios IDE to run a hello world program it says "The Software settings associated with this project is damaged".

    Can u help me out in this issue..

    Many thanks...