Signal DescriptionMPC5566 Microcontroller Reference Manual, Rev. 22-24 Freescale Semiconductor2.3.2.30 External Transfer Error Acknowledge / Ethernet Receive Data / GPIOTEA_FEC_RXD[3]_GPIO[71]TEA_FEC_RXD[3]_GPIO[71] indicates that an error occurred in the current external bus transfer. Thealternate function is FEC receive data [3].2.3.2.31 External Bus Request / Ethernet Management Clock / GPIOBR_FEC_MDC_GPIO[72]BR_FEC_MDC_GPIO[72] is the bus request. The alternate function is the Ethernet management clockoutput, FEC_MDC.2.3.2.32 External Bus Grant / Ethernet Management Data I/O / GPIOBG_FEC_MDIO_GPIO[73]BG_FEC_MDIO_GPIO[73] is the bus grant. The secondary function is the Ethernet management data I/O,FEC_MDIO.2.3.2.33 External Bus Busy / GPIOBB_GPIO[74]BB_GPIO[74] is the external bus busy.2.3.3 Nexus Signals2.3.3.1 Nexus Event InEVTIEVTI is an input that is read during a debug port reset to enable or disable the Nexus Auxiliary port fordata trace. After reset, the EVTI pin is used to initiate program and data trace synchronization messagesor generate a breakpoint.2.3.3.2 Nexus Event OutEVTOEVTO is an output that provides timing to a development tool for a single watchpoint or breakpointoccurrence.2.3.3.3 Nexus Message Clock OutMCKOMCKO is a free running clock output to the development tools which is used for timing of the MDO andMSEO signals.
