MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
25-13
25.4.5
System Clock Locked Indication
Following a power-on reset, the lsb of the auxiliary output port pins (MDO0) can be monitored to provide
the lock status of the system clock. MDO0 is driven to a logic 1 until the system clock achieves lock after
exiting power-on reset. After the system clock is locked, MDO0 is negated and tools may begin Nexus
configuration. Loss of lock conditions that occur subsequent to the exit of power-on reset and the initial
lock of the system clock do not cause a Nexus reset, and therefore do not result in MDO0 driven high.
25.5
Nexus Port Controller (NPC)
The Nexus port controller (NPC) is that part of the NDI that controls access and arbitration of the
MPC5553/MPC5554’s internal Nexus modules. The NPC contains the port configuration register (PCR)
and the device identification register (DID). The contents of the DID are the same as the JTAGC device
identification register.
25.5.1
Overview
The MPC5553/MPC5554 incorporates multiple modules that require development support. Each of these
modules implements a development interface based on the IEEE-ISTO 5001-2001 standard and must
share the input and output ports that interface with the development tool. The NPC controls the usage of
these ports in a manner that allows the individual modules to share the ports, while appearing to the
development tool as a single module.
25.5.2
Features
The NPC performs the following functions:
•
Controls arbitration for ownership of the Nexus auxiliary output port
•
Nexus device identification register and messaging
•
Generates MCKO enable and frequency division control signals
•
Controls sharing of EVTO
•
Control of the device-wide debug mode
•
Generates asynchronous reset signal for Nexus modules based on JCOMP input, censorship status,
and power-on reset status
•
System clock locked status indication via MDO0 during Nexus reset
•
Provides Nexus support for censorship mode
0b0011
eTPU2 (ENGINE2_SRC)
1
0b0100
eTPU CDC
2
(CDC_SRC)
0b0101-0b1111
Reserved
1
MPC5554 only, not in the MPC5553.
2
CDC is the eTPU Coherent Dual-Parameter Controller. Refer to the eTPU
Reference Manual for more information.
Table 25-8. SRC Packet Encodings (Continued)
SRC[3:0]
Client
Summary of Contents for MPC5553
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