MAC7200 datasheet(255/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

177

NOTE

Data Trace is only performed on the ARM7 bus. DMA accesses to the

Advanced High-performance Bus (AHB) are not traced.

11.11.3.2 DTM Message Formats

The A7S Nexus3 block supports five types of DTM Messages: Data Write, Data Read, Data Write

Synchronization, Data Read Synchronization and Error Messages.

11.11.3.2.1

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 following format:

11.11.3.2.2

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 following format:

11.11.3.2.3

DTM 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 Data Trace Message attempts to enter the queue while it is being emptied, the Error Message will

incorporate the Data Trace only error encoding (00010). If both OTM and Data Trace Messages attempt

to enter the queue, the Error Message will incorporate the OTM and Data 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.

(1–32 bits)

(3 bits)

(4 bits)

(6 bits)

Data Value

Relative Address

Data Size

Src. Proc.

TCODE (000101)

Max length = 77 bits; Min length = 15 bits

Figure 11-39. Data Write Message Format

(1–32 bits)

(3 bits)

(4 bits)

(6 bits)

Data Value

Relative Address

Data Size

Src. Proc.

TCODE (000110)

Max length = 77 bits; Min length = 15 bits

Figure 11-40. Data Read Message Format

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