ID:98012 Number of metastability protection registers is not specified. Based on the parameter value CLOCKS_ARE_SYNCHRONIZED=FALSE, the synchronization register chain length between read and write clock domains will be 2

CAUSE: You compiled the DCFIFO but did not specify the number of synchronizing registers.

ACTION: IF 2 synchronizing registers are acceptable, no action needs to be taken and the warning may be ignored. Otherwise, specify a desired synchronization register chain length for the read and write sides.