Nexus Development Interface (NDI)
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor 36-71
36.7.2 Nexus2+ Block Diagram
Figure 36-52. e200z0 Nexus2+ Functional Block Diagram
36.7.3 Nexus2+ Features
The Nexus2+ module is compliant with Class 2 of the IEEE-ISTO 5001-2003 standard, with additional
Class 3 and 4 features available. The following features are implemented:
• Program trace via branch trace messaging (BTM). Branch trace messaging displays program flow
discontinuities (direct and indirect branches, exceptions, etc.), allowing the development tool to
interpolate what transpires between the discontinuities. Thus static code may be traced.
• Ownership trace via ownership trace messaging (OTM). OTM facilitates ownership trace by
providing visibility of which process ID or operating system task is activated. An ownership trace
message is transmitted when a new process/task is activated, allowing the development tool to
trace ownership flow.
• Run-time access to embedded processor registers and memory map via the JTAG port. This allows
for enhanced download/upload capabilities.
• Watchpoint messaging via the auxiliary pins.
• Watchpoint trigger enable of program and/or data trace messaging.
• Higher speed data input/output via the auxiliary port.
• Registers for program trace, ownership trace and watchpoint trigger.
• All features controllable and configurable via the JTAG port.
Message
Queues
NPC
Control and
I/O Logic
Memory Control
Control/Status
Registers
Registers
DMA Registers
DMA
(Read/Write)
Arbitration
Instruction
Snoop
12
MDO[12:0]
MSEO0
MSEO1
MCKO
EVTO
EVTI
TDI
TDO
TMS
TCLK
TRST
Breakpoint/
Watchpoint
Control
OnCE Debug
Nexus2+ Module
Nexus1 Module (within core CPU)
Core CPU Virtual Bus
System Bus
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