Artesyn MVME2502 Installation and Use (April 2015) - Manual (Page 155)

Programming Model
MVME2502 Installation and Use (6806800R96E) 155
7.7.2 Real Time Clock Input
The RTC clock input is driven by 1 MHz clock generated by the CPLD. This provides a fixed clock
reference for the QorIQ P2020 PIC timers which the software can use as a known time
reference.
7.7.3 Local Bus Controller Clock Divisor
The local bus controller (LBC) clock output is connected to the CPLD for LBC bus transaction. It
is also the source of 1 MHz (CPU_RTC) and CPLD tick timers.