Freescale Semiconductor MPC5553 - NZ6 C3 Read;Write Access to Memory-Mapped Resources

MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor 25-61
25.11.14.3 Watchpoint Error Message
An error message occurs when a new message cannot be queued due to the message queue being full. The
FIFO will discard messages until it has completely emptied the queue. After it is emptied, an error message
will be queued. The error encoding will indicate which types of messages attempted to be queued while
the FIFO was being emptied.
If only a watchpoint message attempts to enter the queue while it is being emptied, the error message will
incorporate the watchpoint only error encoding (00110). If an OTM and/or program trace and/or data trace
message also attempts to enter the queue while it is being emptied, the error message will incorporate error
encoding (01000).
NOTE
The OVC bits within the DC1 register can be set to delay the CPU in order
to alleviate (but not eliminate) potential overrun situations.
Error information is messaged out in the following format (see Table 25-20)
:
Figure 25-49. Error Message Format
25.11.14.4 Watchpoint Timing Diagram (2 MDO/1 MSEO Configuration)
Figure 25-50. Watchpoint Message & Watchpoint Error Message
25.11.15 NZ6C3 Read/Write Access to Memory-Mapped Resources
The read/write access feature allows access to memory-mapped resources via the JTAG/OnCE port. The
read/write mechanism supports single as well as block reads and writes to e200z6 system bus resources.
The NZ6C3 module is capable of accessing resources on the e200z6 system bus, with multiple
configurable priority levels. Memory-mapped registers and other non-cached memory can be accessed via
the standard memory map settings.
All accesses are setup and initiated by the read/write access control/status register (RWCS), as well as the
read/write access address (RWA) and read/write access data registers (RWD).
ECODE (00110 / 01000)
msb lsb
12
SRC TCODE (001000)
3
6 bits4 bits5 bits
Fixed length = 15 bits
WPM:
MCKO
MSEO
TCODE = 15
Source Processor = 0b00
Watchpoint Number = 2
MDO[1:0] 11 00 00 10 00 00 00 10 00 00 10 01 00
Error:
TCODE = 8
Source Processor = 0b00
Error Code = 6 (Queue Overrun – WPM Only)
ErrorWatchpoint
11