When implementing a design targeting the Automotive CoolRunner-II family, I receive an error message similar to the following:
"Checking timing specifications ...
Checking expanded design ...
ERROR:NgdBuild:423 - The CLK_DIV4 symbol "XLXI_1" is not supported in the acr2
architecture. Please check the Libraries Guide in order to pick an
appropriate component. If this design was synthesized, try targetting the
synthesis to the current architecture."
NGDBuild fails to recognize Clock Divider components as valid components in this device.
This problem has been fixed in the latest 8.1i Service Pack available at:
The first service pack containing the fix is 8.1i Service Pack 1.