NXP Semiconductors PXN2020, Reference Manual, Page: 107 / 1376

Signal Description
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor 3-39
3.4.10.11 PK10 — GPIO (PK[10]) / DSPI_B Peripheral Chip Select (PCS_B[5]) /
DSPI_D Peripheral Chip Select (PCS_D[2]) / DSPI_A Peripheral Chip
Select (PCS_A[3])
PK[10] is a GPIO pin. PCS_B[5] is a peripheral chip select output pin for the DSPI A module. PCS_D[2]
is a peripheral chip select output pin for the DSPI A module. PCS_A[3] is a peripheral chip select output
pin for the DSPI A module.
3.4.11 Nexus Signals
Except as noted, the Nexus signals are available only on the 256-pin package. For more information, see
Chapter 36, Nexus Development Interface (NDI).
3.4.11.1 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. On the 208-pin BGA package, this pin is multiplexed with PC2.
3.4.11.2 Nexus Event Out
EVTO
EVTO is an output that provides timing to a development tool for a single watchpoint or breakpoint
occurrence. On the 208-pin BGA package, this pin is multiplexed with PC3.
3.4.11.3 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.
3.4.11.4 Nexus Message Data Out
MDO[0]
MDO[0] indicates power-on reset (POR) status. In addition, MDO[0] indicates the lock status of the
system clock following a POR. MDO[0] is driven high following a POR until the system clock achieves
lock, at which time it is then negated. There is an internal pullup on MDO[0].
3.4.11.5 Nexus Message Data Out
MDO[11:1]
MDO[11:1] are the trace message outputs to the development tools for full port mode.