data error!help

[Altera_Forum]

look at the picture,why CpuData is wrong,but RdBuf is right, 

assign CpuData = ( CpuDataVld &HRCW_over_flag )? {8'h00,CpuDataOut} : 16'hzzzz ; assign RdBuf = ( CpuDataVld &HRCW_over_flag )? CpuDataOut : 8'hzz ;   note:1.cpudata is a bidirection port,but rdbuf is a reg; 2.clock is 66mhz   3.the picture is a signaltap 

[Altera_Forum]

--- Quote Start ---  look at the picture,why CpuData is wrong,but RdBuf is right, assign CpuData = ( CpuDataVld &HRCW_over_flag )? {8'h00,CpuDataOut} : 16'hzzzz ; assign RdBuf = ( CpuDataVld &HRCW_over_flag )? CpuDataOut : 8'hzz ;  --- Quote End ---    Hi,  is your Signaltap capture clock synchronous to the data you try to capture ?  Kind regards  GPK

[Altera_Forum]

--- Quote Start ---  Hi,  is your Signaltap capture clock synchronous to the data you try to capture ?  Kind regards  GPK  --- Quote End ---   Sorry ,  maybe I was a little too fast.  Is your picture a signaltap or a simulation output ? Can you zoom in so that it is possible to see all value ?  Kind regards

[Altera_Forum]

--- Quote Start ---  Sorry ,  maybe I was a little too fast.  Is your picture a signaltap or a simulation output ? Can you zoom in so that it is possible to see all value ?  Kind regards  --- Quote End ---    Hi,  you mentioned that RdBuf is a "reg", but as far as I know you can't use "assign" for reg.   assign RdBuf = ( CpuDataVld &HRCW_over_flag )? CpuDataOut : 8'hzz ;  CpuData is a Toplevel port ? What is connected to this port ?  assign CpuData = ( CpuDataVld &HRCW_over_flag )? {8'h00,CpuDataOut} : 16'hzzzz ;  According to your assignment CpuData is only during CpuDataVld "1" = CpuDataOut. With CpuDataVld "0" you switch back to "z". Maybe somebody is driving the port ?  Can you zoom in your traces, in orde to see what values are caaptured ?  Kind regards  GPK