Verilog synthesize errors: multi-source in Unit on signal

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tanzil_dhk

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i m trying to do a simple robot controller in verilog ..while trying to to synthesize my code its showing an error message like this........

ERROR:Xst:528 - Multi-source in Unit <RNAV> on signal <robotdirection<2>>
ERROR:Xst:528 - Multi-source in Unit <RNAV> on signal <robotdirection<1>>
ERROR:Xst:528 - Multi-source in Unit <RNAV> on signal <robotdirection<0>>
ERROR: XST failed

note: robotdirection is my 3 bit output of the program
 

Re: synthesize problem

It Describes there is multiple driver on the output.
 

Re: synthesize problem

Yes, it's not allow multidriver!
 

synthesize problem

that means you are assigning values to your output in diffrent always block
 

synthesize problem

befor synthesize, you can use Nlint to check your code and find this error
 

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