Signal Description
MPC5566 Microcontroller Reference Manual, Rev. 2
2-24 Freescale Semiconductor
2.3.2.30 External Transfer Error Acknowledge / Ethernet Receive Data / GPIO
TEA
_FEC_RXD[3]_GPIO[71]
TEA_FEC_RXD[3]_GPIO[71] indicates that an error occurred in the current external bus transfer. The
alternate function is FEC receive data [3].
2.3.2.31 External Bus Request / Ethernet Management Clock / GPIO
BR
_FEC_MDC_GPIO[72]
BR_FEC_MDC_GPIO[72] is the bus request. The alternate function is the Ethernet management clock
output, FEC_MDC.
2.3.2.32 External Bus Grant / Ethernet Management Data I/O / GPIO
BG
_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 / GPIO
BB
_GPIO[74]
BB_GPIO[74] is the external bus busy.
2.3.3 Nexus Signals
2.3.3.1 Nexus Event In
EVTI
EVTI is an input that is read during a debug port reset to enable or disable the Nexus Auxiliary port for
data trace. After reset, the EVTI pin is used to initiate program and data trace synchronization messages
or generate a breakpoint.
2.3.3.2 Nexus Event Out
EVTO
EVTO is an output that provides timing to a development tool for a single watchpoint or breakpoint
occurrence.
2.3.3.3 Nexus Message Clock Out
MCKO
MCKO is a free running clock output to the development tools which is used for timing of the MDO and
MSEO signals.
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