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Valued Contributor III
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SDRAM DQ always enable buffer error

I have added a SDRAM to my SOPC system, I have instantiated my SOPC system perfectly alright. But when I compile the design, I get the following error 

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Error: The node "NIOS_FFT:NIOS_FFT_UUT|Memory_SDram:the_Memory_SDram|za_data[17]" has multiple drivers due to the always-enabled I/O buffer "NIOS_FFT:NIOS_FFT_UUT|zs_dq_to_and_from_the_Memory_SDram[17]" 

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Can somebody guide me about how to solve this issue? dq of sdram is an io signal, whereas data is an output signal. The code generated by SOPC is given here.... error relates to "za_data <= zs_dq" line 

 

 

--- Quote Start ---  

always @(posedge clk or negedge reset_n) 

begin 

if (reset_n == 0) 

za_data <= 0; 

else  

za_data <= zs_dq; 

end 

--- Quote End ---  

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