UM0434 datasheet(354/390 Pages) STMICROELECTRONICS

354 / 390 page

UM0434

Nexus3 module

355/391

If only a program trace message attempts to enter the queue while it is being emptied, the

error message incorporates the program trace only error encoding, 00001. If both OTM and

program trace messages attempt to enter the queue, the error message incorporates the

OTM and program trace error encoding 00111. If a watchpoint also attempts to be queued

while the FIFO is being emptied, the error message incorporates error encoding 01000.

Note:

DC1[OVC] can be set to delay the CPU in order to alleviate, but not eliminate, potential

overrun situations.

Error information is messaged out in the format shown in

Table 253:

Program trace synchronization messages

A program trace direct/indirect branch with synchronization message is messaged using the

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

Table 256):

●

Initial program trace message upon the first direct/indirect branch after exit from system

reset or whenever program trace is enabled

●

Upon direct/indirect branch after returning from a CPU low-power state

●

Upon direct/indirect branch after returning from debug mode

●

Upon direct/indirect branch after occurrence of queue overrun, which can be caused by

any trace message

●

Upon direct/indirect branch after the periodic program trace counter has expired,

indicating 255 without-synchronization program trace messages have occurred since

the last with-synchronization message occurred

●

Upon direct/indirect branch after assertion of the event-in (

nex_evti_b) signal, if the EIC

bits within the DC1 register have enabled this feature

●

Upon direct/indirect branch after the sequential instruction counter has expired,

indicating 255 instructions have occurred between branches

●

Upon direct/indirect branch after a BTM message was lost due to an attempted access

to a secure memory location (for SOCs with security)

●

Upon direct/indirect branch after a BTM message was lost due to a collision entering

the FIFO between the BTM message and either a watchpoint message or an

ownership trace message

If the Nexus3 module is enabled at reset, a

nex_evti_b assertion initiates a program trace

direct/indirect branch with synchronization message if program trace is enabled upon the

first direct/indirect branch. The format for program trace direct/indirect branch with

synchronization messages is shown in

Table 254:

Table 253.

Error message format

(5 bits)

(4 bits)

(6 bits)

Error Code(1)

Must be one of 00001, 00111, or 01000.

Source Process

TCODE (001000)

Fixed length = 15 bits

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