Nexus Development Interface (NDI)
MPC5606S Microcontroller Reference Manual, Rev. 7
958 Freescale Semiconductor
26.4.2 Operating mode
In Full-Port mode, all available MDO pins are used to transmit messages. All trace features are enabled or
can be enabled by writing the configuration registers via the JTAG port. Four MDO pins are available in
Full-Port mode.
26.4.2.1 Disabled-Port mode
In Disabled-Port mode, message transmission is disabled. Any debug feature that generates messages
cannot be used. The primary features available are class 1 features and read/write access.
26.4.2.2 Censored mode
The NDI supports internal flash censorship mode by preventing the transmission of trace messages and
Nexus access to memory-mapped resources when censorship is enabled.
26.4.2.3 Stop mode
Stop mode logic is implemented in the Nexus port controller (NPC). When a request is made to enter Stop
mode, the NDI block completes monitoring of any pending bus transaction, transmits all messages already
queued, and acknowledges the stop request. After the acknowledgment, the system clock inputs are shut
off by the clock driver on the device. While the clocks are shut off, the development tool cannot access
NDI registers via the JTAG port.
26.5 External signal description
All the signals are available in the 208BGA without any multiplexing scheme. Refer to Chapter 3, Signal
Description, for details.
26.5.1 Nexus signal reset states
Table 26-1. NDI signal reset state
Name Function
Nexus reset
state
Pull
EVTI Event-in pin — Up
EVTO Event-out pin 0b1 —
MCKO Message clock out pin 0b0 —
MDO[3:0] Message data out pins 0 —
MSEO Message start/end out pin 0b1 —
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