UM0434 datasheet(361/390 Pages) STMICROELECTRONICS

361 / 390 page

Nexus3 module

UM0434

362/391

Data trace synchronization messages

A data trace write/read with synchronization message is messaged through the auxiliary

port, provided data trace is enabled, for the following conditions (see

Table 262):

●

Initial data trace message after exit from system reset or whenever data trace is

enabled

●

Upon returning from a CPU low-power state

●

Upon returning from debug mode

●

After occurrence of queue overrun (can be caused by any trace message), provided

data trace is enabled

●

After the periodic data trace counter has expired, indicating 255 data trace messages

have occurred without synchronization since the last with-synchronization message

occurred

●

Upon assertion of the event-in

nex_evti_b pin, the first data trace message is a

synchronization message if the EIC bits of the DC1 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 SOC’s 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 any of the following:

–

watchpoint message

–

ownership trace message

–

branch trace message

Data trace synchronization messages provide the full address, without leading zeros, and

ensure 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

synchronization messages is as follows:

Exception conditions that result in data trace synchronization are summarized in

Table 262.

Table 260.

Error message format

(5 bits)

(4 bits)

(6 bits)

Error Code (00010/00111/01000

Source Process

TCODE (001000)

Fixed length = 15 bits

Table 261.

Data write/read with synchronization message format

(1–64 bits)

(1–32 bits)

bits)

(4 bits)

(6 bits)

Data Value

Full Address

Data

Size

Source

Process

TCODE

(001101 or 001110)

Maximum length = 109 bit; Minimum length = 15 bits

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