An errata is related to the Nexus port on MPC563xM devices. Slew rate on Nexus pins remains slow when Nexus is enabled.
Use below initialization sequence to change the slew rate of Nexus pins.
Check the errata document for your target device to see if this issue is still applicable.
S 0xC3F901F6 W 0x000C
S 0xC3F901F8 W 0x000C
S 0xC3F901FA W 0x000C
S 0xC3F901FC W 0x000C
S 0xC3F901FE W 0x000C
S 0xC3F90200 W 0x000C
S 0xC3F90202 W 0x000C
S 0xC3F90206 W 0x000C
S 0xC3F90208 W 0x000C
See Initialization Sequence chapter in winIDEA Help for more details on initialization sequence configuration.