AR# 1293: XC5200: UserClk must be enabled in Makebits before CK_DIV will be used.
AR# 1293
XC5200: UserClk must be enabled in Makebits before CK_DIV will be used.
Description
The CK_DIV symbol is used when you want to bring in an external clock signal from off-chip. However, placing the symbol on schematic alone will not tell the Xilinx tools that your design is being clocked externally.
解决方案
You also need to enable the user clock in MakeBits by typing: