MAC7200 datasheet(256/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

178

Freescale Semiconductor

Error information is messaged out in the following format:

11.11.3.2.4

Data Trace Synchronization Messages

A Data Trace Write/Read with Sync. Message is messaged via the auxiliary port (provided Data Trace is

enabled) for the following conditions (see Table 11-40):

•

Initial Data Trace Message upon exit from system reset or whenever Data Trace is enabled will be

a synchronization message.

•

Upon returning from a Low Power state, the first Data Trace Message will be a synchronization

message.

•

Upon returning from Debug Mode, the first Data Trace Message will be a synchronization

message.

•

After occurrence of queue overrun (can be caused by any trace message), the first Data Trace

Message will be a synchronization message.

•

After the periodic data trace counter has expired indicating 255 without-sync Data Trace Messages

have occurred since the last with-sync message occurred.

•

Upon assertion of the Event In (EVTI) pin, the first Data Trace Message will be a synchronization

message if the EIC bits of the DC Register have enabled this feature.

•

Upon Data Trace Write/Read after the previous DTM Message was lost due to an attempted access

to a secure memory location (for SoCs with security).

•

Upon Data Trace Write/Read after the previous DTM Message was lost due to a collision entering

the FIFO between the DTM Message and two other higher priority messages.

Data Trace Synchronization Messages provide the full address (without leading zeros) and insure that

development tools fully synchronize with Data Trace regularly. Synchronization messages provide a

reference address for subsequent DTMs, in which only the unique portion of the Data Trace address is

transmitted. The format for Data Trace Write/Read with Sync. Messages is as follows:

Exception conditions that result in Data Trace Synchronization are summarized in Table 11-40.

(5 bits)

(4 bits)

(6 bits)

Error Code (00010 / 00111 / 01000)

Src. Proc.

TCODE (001000)

Fixed length = 15 bits

Figure 11-41. Error Message Format

(1–32 bits)

(3 bits)

(4 bits)

(6 bits)

Data Value

Full Address

Data Size

Src. Proc.

TCODE (001101 or 001110)

Max length = 77 bits; Min length = 15 bits

Figure 11-42. Data Write/Read with Sync. Message Format

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