General Description: After I instantiate an OBUFT_F_24 in my design, the following error message is reported in NGDBuild:
"ERROR:NgdBuild:604 - logical block 'INST_OBUFT_F_24' with type 'OBUFT_F_24' could not be resolved. A pin name misspelling can cause this, a missing EDIF or NGC file, or the misspelling of a type name. Symbol 'OBUFT_F_24' is not supported in target 'architecture'."
The drive strength of 24 is supported when it is verified using SPEEDPRINT. To work around this issue, use the instance of OBUFT_LVCMOS25_F_24. NGDBuild will then work properly.
This will be fixed in the next software release (after 5.1i).