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Altera_Forum
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10 years ago

Error 17044 in nios design with sdram

Hi,

I have built a design using Nios core and sdram (dd3 sdram controller with UniPHY). I get the following error during compilation:

Error (17044): Illegal connection found on I/O input buffer primitive nios:inst|nios_sdram_new:sdram_new|nios_sdram_new_p0:p0|nios_sdram_new_p0_memphy:umemphy|nios_sdram_new_p0_new_io_pads:uio_pads|nios_sdram_new_p0_altdqdqs:dq_ddio[3].ubidir_dq_dqs|altdq_dqs2_stratixv:altdq_dqs2_inst|strobe_in. Source IO nios:inst|nios_sdram_new:sdram_new|nios_sdram_new_p0:p0|nios_sdram_new_p0_memphy:umemphy|nios_sdram_new_p0_new_io_pads:uio_pads|nios_sdram_new_p0_altdqdqs:dq_ddio[3].ubidir_dq_dqs|altdq_dqs2_stratixv:altdq_dqs2_inst|obuf_os_0 also drives out to other destination than the buffer.

I am unable to understand why do I get this error?

Can anybody help me out?

Thanks.

4 Replies

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

    Hello,

    Carefully read last few words in error : "XXXX also drives out to other destination than the buffer." It suggests that one of your ports of sdram ( probably strobe_in ) has been connected to other logic besides to buffer. I think it should have connection only to buffer.

    I hope this will help.

    Cheers,

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

    I dont think I have connected it wrongly. What are the correct connections to make? I just have two connections, the clock and reset. What connections are to be made for the sdram?

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

    I read somewhere that running the pin_assignment.tcl script can sort this. But even this script is to run after a successful Analysis and Synthesis. But I cannot get past this error.

    Please help.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    10 years ago

    Hello,

    Is it possible to upload your project here in archived form? I would like to have a look at it. To archive project, select archive project... under project Tab.

    Cheers,

    Bhaumik