PXD10RM Datasheet, PDF (978/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

Table 26-14. MCKO_DIV Values (continued)
MCKO_DIV[2:0]
0b100
0b101
0b110
0b111
MCKO Frequency
Reserved
Reserved
Reserved
SYS_CLK8
26.7.5 Nexus Messaging
Most of the messages transmitted by the NDI include a SRC field. This field is used to identify which
source generated the message. Table 26-15 shows the values used for the SRC field by the different clients
on the PXD10. These values are specific to the PXD10. The size of the SRC field in transmitted messages
is 4 bits. This value is also specific to the PXD10.
Table 26-15. SRC Packet Encodings
SRC[3:0]
PXD10 Client
0b0000
All other combinations
e200z0
Reserved
26.7.6 EVTO Sharing
The NPC block controls sharing of the EVTO output between all Nexus clients that generate an EVTO
signal. The sharing mechanism is a logical AND of all incoming EVTO signals from Nexus blocks,
thereby asserting EVTO whenever any block drives its EVTO. When there is no active MCKO, such as in
disabled mode, the NPC drives EVTO for two system clock periods. EVTO sharing is active as long as the
NDI is not in reset.
26.7.7 Debug Mode Control
On PXD10, program breaks can be requested either by using the EVTI pin as a break request, or when a
Nexus event is triggered.
26.7.7.1 EVTI Generated Break Request
To use the EVTI pin as a debug request, the EIC field in the e200z0 Nexus2+ Development Control
Register 1 (DC1[4:3]) must be set to configure the EVTI input as a debug request.
26.7.8 Nexus Reset Control
The JCOMP input that is used as the primary reset signal for the NPC is also used by the NPC to generate
a single-bit reset signal for other Nexus blocks. The single bit reset signal functions much like the IEEE
1149.1-2001 defined TRST signal but has a default value of disabled (JCOMP is pulled low during reset)
The IEEE 1149.1-2001 defines TRST to be pulled up (enabled) by default.
26-18
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor