Nexus
MPC5566 Microcontroller Reference Manual, Rev. 2
25-74 Freescale Semiconductor
25.15.2 Features
Features include the following:
• Data trace via data write messaging (DWM) and data read messaging (DRM). This provides the
capability for the development tool to trace reads and/or writes through the eDMA module to
(selected) internal memory resources.
• Watchpoint messaging via the auxiliary pins.
• Watchpoint trigger enable of data trace messaging (DTM).
• Registers for data trace, watchpoint generation, and watchpoint trigger.
• All features controllable and configurable via the JTAG port.
• Power management.
— Low power design
— Dynamic power management of FIFOs and control logic
25.16 External Signal Description
The NXDM module uses the same pins and pin protocol as defined in Section 25.2, “External Signal
Description.”
25.16.1 Rules for Output Messages
The NXDM module observe the same rules for output messages as the NPC. Refer to Section 25.7.2.2.1,
“Rules of Messages.”
25.16.2 Auxiliary Port Arbitration
The NXDM module arbitrate for the shared Nexus port. This arbitration is handled by the NPC (Refer to
Section 25.5, “Nexus Port Controller (NPC)”) based on prioritized requests from the NXDM, and the other
Nexus clients sharing the port.
25.17 NXDM Programmers Model
This section describes the programmers model. Nexus registers are accessed using the JTAG port in
compliance with IEEE® 1149.1. Refer to Chapter 24, “IEEE 1149.1 Test Access Port Controller
(JTAGC)” and Section 25.7.2.3, “IEEE‚ 1149.1-2001 (JTAG) TAP” for details on Nexus register access.
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