UM0434 datasheet(360/390 Pages) STMICROELECTRONICS

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UM0434

Nexus3 module

361/391

12.8.2

DTM message formats

The Nexus3 block supports five types of DTM messages: data write, data read, data write

synchronization, data read synchronization, and error messages.

Data write messages

The data write message contains the data write value and the address of the write access,

relative to the previous data trace message. Data write message information is messaged

out in the format shown in

Table 258:

Data read messages

The data read message contains the data read value and the address of the read access,

relative to the previous data trace message. Data read message information is messaged

out in the format shown in

Table 259:

Note:

For e200z3-based CPUs, the double-word encoding, p_tsiz = 0, indicates a double-word

access and is sent out as a single data trace message with a single 64-bit data value.

The debug/development tool needs to distinguish between the two cases based on the

family of e200z3 processors.

DTM overflow error messages

An error message occurs when the message queue is full and a new message cannot be

queued. The FIFO discards incoming messages until it has completely emptied the queue.

Once emptied, an error message is queued. The error encoding indicates which types of

messages attempted to be queued while the FIFO was being emptied.

If only a DTM attempts to enter the queue while it is being emptied, the error message

incorporates the data trace only error encoding 00010. If both OTM and DTM attempt to

enter the queue, the error message incorporates the OTM and data 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 260:

Table 258.

Data write message format

(1–64 bits)

(1–32 bits)

bits)

(4 bits)

(6 bits)

Data Value(s)

Relative Address

Data

Size

Source

Process

TCODE (000101)

Maximum length = 109 bits; minimum length = 15 bits

Table 259.

Data read message format

(1–64 bits)

(1–32 bits)

bits)

(4 bits)

(6 bits)

Data Value(s)

Relative Address

Data

Size

Source

Process

TCODE (000110)

Maximum length = 109 bits; minimum length = 15 bits

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