ALTFP_ATAN megafunction incorrectly ties its clock enable port to ground

Description

In the ALTFP_ATAN megafunction, the clk_en port is incorrectly tied to ground if you do not enable the port in the MegaWizard Plug-In Manager.

Resolution

In the ALTFP_ATAN MegaWizard Plug-In Manager, enable the clk_en port and either tie it to VCC or control the port as required for your design.

This issue is corrected in the Quartus II software version 12.0 SP1.