MAC7200 datasheet(248/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

170

Freescale Semiconductor

11.11.2.2.2

Indirect Branch Messages (Traditional)

If DC[25] is set in Thumb mode, indirect branch information is messaged out in the following format:

11.11.2.2.3

Direct Branch Messages (Traditional)

Direct branches (conditional or unconditional) are all taken branches whose destination is fixed in the

instruction opcode. If DC[25] is set while in Thumb mode, direct branch information is messaged out in

the following format:

NOTE

When DC[25] is cleared in Thumb mode or the ARM7 processor is in full

32-bit ARM mode, Direct Branch Messages will not be transmitted. Instead,

each direct branch or predicated instruction will toggle a bit in the history

buffer.

11.11.2.2.4

Resource Full Messages

The Resource Full Message is used in conjunction with the Branch History Messages. The Resource Full

Message is generated when the internal branch/predicate history buffer is full. If synchronization is needed

at the time this message is generated, the synchronization is delayed until the next Branch Trace Message

that is not a Resource Full Message.

The current value of the history buffer is transmitted as part of the Resource Full Message. This

information can be concatenated by the tool with the branch/predicate history information from

subsequent messages to obtain the complete branch history for a message. The history value is reset by

this message, and the I-CNT value is reset as a result of a bit being added to the history buffer.

(1–32 bits)

(1–8 bits)

(4 bits)

(6 bits)

U-ADDR

I-CNT

SRC

TCODE (000100)

Max length = 50 bits; Min length = 12 bits

Figure 11-27. Indirect Branch Message (Traditional) Format

(1–8 bits)

(4 bits)

(6 bits)

I-CNT

SRC

TCODE (000100)

Max length = 18 bits; Min length = 11 bits

Figure 11-28. Direct Branch Message Format

(1–32 bits)

(4 bits)

(6 bits)

HIST

RCODE

(0001)

SRC

TCODE (011011)

Max length = 46 bits; Min length = 15 bits

Figure 11-29. Resource Full Message Format

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