Fpga compilation xilinx error 'Process "Map" failed' - 'unroutable situation'

Question

When I try to compile a Labview fpga project on our new system, it fails with the following error summary (the full Xilinx log is attached):
LabVIEW FPGA: The compilation failed due to a xilinx error.
Details:
ERROR:LIT:536 - IBUF symbol "aUserGpio<1>_IBUF" (output
signal=aUserGpio<1>_IBUF) has the attribute IOBDELAY set to value NONE and it
is driving an IODELAY. If the IOBDELAY attribute is on the driving PAD, it
has precedence over the IBUF one. Either the constraint or the design need
modification to prevent an unroutable situation.
Errors found during logical drc.
Design Summary
Number of errors : 1
Number of warnings : 349
Process "Map" failed
Start Time: 10:31:49 AM
End Time: 10:55:32 AM
Total Time: 00:23:43
Hardware:
NI PXIe-1071 Chassis
NI PXIe-8108 Embedded controller
NI PXIe-7965R FPGA FlexRIO FPGA module
NI 5761 250 MS/s 14 bit Analog input digitizer
Installed software:
Labview 2011 version 11.0
Labview FPGA module 11.0.0
FPGA compilation tools (Xilinx12_4)
NI FlexRIO Adapter Module Support 2.2.0
NI-RIO 4.0 (FlexRIO 2.1.0)
Xilinx DRAM compilation bug fix patch from NI article id 5E4FNCDP
Xilinx clock bug fix patch from NI article id 5GFAB7DP
replaces c:\NIFPGA\programs\Xilinx11_5\ISE\xilinx\lib\nt\libPlXil_Clocks.dll; The installed version is c:\NIFPGA\programs\Xilinx12_4-> Manually copied the dll to the installed version
The Project uses the 5761 low speed clip and a DRAM FIFO.
I tried to compile it before installing any patch, after installing the DRAM patch, and after installing both patches and always got a Xilinx error after ~10 minutes compile time. The error summary shown above and the attached Xilinx log are from compiling with both patches installed.
It compiled correctly on our older system:
Hardware:
NI PXIe-1082 Chassis
NI PXIe-8133 Embedded controller
NI PXIe-7965R FPGA FlexRIO FPGA module
NI 5761 250 MS/s 14 bit Analog input digitizer
Installed software:
Labview2011version10.0.0
LabviewFPGAmodule10.0.0
FPGAcompilationtools (Xilinx11_5)
NIFlexRIOAdapterModuleSupport2.1.0
NI-RIO3.5.1 (FlexRIO1.5.0)
XilinxDRAMcompilationbugfixpatchfromNIarticleid5E4FNCDP
Any help / suggestions greatly appreciated,
Fabrizio
Attachments:
XilinxLog.txt ‏1482 KB

Answer 1

Hi Torpedotown, 
Can you tell me what version of FlexRIO Adapter Module Support you are using? 
The 5761 Low Speed CLIP has a constraint that doesn't work properly with some versions of the compilation tools.  In order to solve this you should be able to upgrade to our latest version of FAM support, or go change the constraint manually.  
For the latest version of FAM support, go to http://ni.com/info and enter code "famsoftware"
If you've modified constraint files before and feel comfortable doing it yourself, let me know and I can provide you with the details on how to do that. 
Thanks!
National Instruments
FlexRIO & R-Series Product Support Engineer