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Visitor silentx
Visitor
8,196 Views
Registered: ‎12-05-2007

Problems with instantiation with Verilog (using xapp458)


I have tried to implement xapp458 which is an application to use the DDR2 SDRAM in Spartan 3A. However, for this module, vlog_xst_bl4_main_0, it clearly instantiates the following module
vlog_xst_bl4_top_0 top0
      (
       .auto_ref_req           (auto_ref_req),
       .wait_200us             (wait_200us),
        ...
       );

Yet as shown in the image I have attached, it doesn't allow me to add vlog_xst_bl4_top_0 module to it!
I don't get it, it works for every other module instantiating other modules. Why?

Please help!
framebuf.jpg
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2 Replies
Newbie stationary
Newbie
8,138 Views
Registered: ‎01-11-2008

Re: Problems with instantiation with Verilog (using xapp458)

I met the same problem. and I used Spartan-3,too
 
but it was OK when I used vhdl core.
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Highlighted
Newbie mxc_smiths
Newbie
7,983 Views
Registered: ‎03-03-2008

Re: Problems with instantiation with Verilog (using xapp458)

I now start wondering if Xilinx had really tested these reference designs before release.
 
I had the same problem with XAPP458 ref design. I did the following to get rid of this issue:
 
commented out //`include "../source/sdramtst/vlog_xst_bl4_parameters_0.v" on each file and copied the contents of vlog_xst_bl4_parameters_0.v to the same place. So now the design passed synthesis. However, I still have problem with constraints in the provided ucf. An example:
 
ERROR:NgdBuild:753 - "C:/Xilinx_projects/sp3an458/source/framebuf.ucf" Line 773:
   Could not find instance(s)
   'vlog_xst_bl4_inst/infrastructure_top0/cal_top0/cal_ctl0' in the design.  To
   suppress this error specify the correct instance name or remove the
   constraint.
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