MAC7200 datasheet(249/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

171

11.11.2.2.5

Program Correlation Messages

Program Correlation Messages (PCM) are used to correlate events to the program flow that may not be

associated with the instruction stream. In order to maintain accurate instruction tracing information when

entering debug mode, program trace is disabled or entering CPU low power mode a PCM is sent. It

includes the instruction count and branch history. Program Correlation is messaged out in the following

format:

11.11.2.2.6

BTM Overflow Error Messages

An Error Message occurs when a new message cannot be queued due to the message queue being full. The

FIFO will discard incoming messages until it has completely emptied the queue. Once emptied, an Error

Message will be queued. The error encoding will indicate which type(s) of messages attempted to be

queued while the FIFO was being emptied.

If only a Program Trace Message attempts to enter the queue while it is being emptied, the Error Message

will incorporate the Program Trace only error encoding (00001). If both OTM and Program Trace

Messages attempt to enter the queue, the Error Message will incorporate the OTM and Program Trace error

encoding (00111). If a Watchpoint also attempts to be queued while the FIFO is being emptied, then the

Error Message will incorporate error encoding (01000).

NOTE

The OVC bits within the DC Register can be set to delay the CPU by

asserting the FIFOFULL signal in order to alleviate (but not eliminate)

potential overruns.

Error information is messaged out in the following format:

11.11.2.2.7

Program Trace Synchronization Messages

A Program Trace Direct/Indirect Branch with Sync. or Indirect Branch History with Sync. Message is

messaged via the auxiliary port (provided Program Trace is enabled) for the following conditions (see

Table 11-39):

•

Initial Program Trace Message upon the first direct (traditional only) or indirect branch after exit

from system reset or whenever program trace is enabled.

•

Upon direct (traditional only) or indirect branch after returning from a Low Power state.

(1–32 bits)

(1–8 bits)

(4 bits)

(6 bits)

HIST

I-CNT

ECODE

SRC

TCODE (100001)

Max length = 54 bits; Min length = 16 bits

Figure 11-30. Program Correlation Message Format

(5 bits)

(4 bits)

(6 bits)

ERROR (00001 / 00111 / 01000)

SRC

TCODE (001000)

Fixed length = 15 bits

Figure 11-31. Error Message Format

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