General Description: In the 3.1i version of the CORE Generator, the .veo template for the Dual Channel Numerically Controlled Oscillator core for Spartan-II is generated incorrectly.
There are two problems:
1. The path delimiters should be forward slashes, not backslashes 2. The model name is ncoiqvht.v instead of ncoiq_v1_0.v
Solution
Edit the .veo and correct the reference manually to point to <path_to_Xilinx_installation>/verilog/src/XilinxCoreLib/ncoiq_v1_0.v.