Clock enable for connected module not having it

The things may be more complicated than I thought before. Analyzing the remote update block documentation I do not see any specification for the clock. I see only clock speed up to 40 MHz and that it must be "valid". Nothing about clock duty cycle. And unfortunately, implementing the clocking using clock enable turns clock to duty cycle other than 50%, and pulse width will be the same as original clock at 120 MHz. Within the "remote_update" module clock connects to "cycloneiii_rublock", and I can not find any information on it.