PXD10RM Datasheet, PDF (963/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

— One message start/end out pins (MSEO).
— One watchpoint event pin (EVTO).
— One event-in pin (EVTI).
— One message clock out pin (MCKO).
— Four pin JTAG port (TDI, TDO, TMS, and TCK).
• Registers for program trace, ownership trace, and watchpoint trigger.
• All features controllable and configurable via the JTAG port.
• Run-time access to the on-chip memory map via the Nexus read/write access protocol. This allows
for enhanced download/upload capabilities.
• All features are independently configurable and controllable via the IEEE 1149.1 I/O port.
• The NDI block reset is controlled with JCOMP, power-on reset, and the TAP state machine. All
these sources are independent of system reset.
• Support for internal censorship mode to prevent external access to flash memory contents when
censorship is enabled.
NOTE
If the e200z0 cores has executed a wait instruction, then the Nexus2+
controller clocks are gated off. While the core is in this state, it is not be
possible to perform Nexus read/write operations.
26.4 Modes of Operation
The NDI block is in reset when the TAP controller state machine is in the TEST-LOGIC-RESET state. The
TEST-LOGIC-RESET state is entered on the assertion of the power-on reset signal or through state
machine transitions controlled by TMS. Ownership of the TAP is achieved by loading the appropriate
enable instruction for the desired Nexus client in the JTAGC controller (JTAGC) block.
The NPC transitions out of the reset state immediately following negation of power-on reset.
26.4.1 Nexus Reset
In Nexus reset mode, the following actions occur:
• Register values default back to their reset values.
• The message queues are marked as empty.
• The auxiliary output port pins are negated if the NDI controls the pads.
• The TDO output buffer is disabled if the NDI has control of the TAP.
• The TDI, TMS, and TCK inputs are ignored.
• The NDI block indicates to the MCU that it is not using the auxiliary output port. This indication
can be used to three-state the output pins or use them for another function.
Freescale Semiconductor
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
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