MAC7200 datasheet(212/976 Pages) FREESCALE

212 / 976 page

Introduction

MAC7200 Microcontroller Family Reference Manual, Rev. 2

134

Freescale Semiconductor

NOTE

Due to the conditional nature of 32-bit ARM instructions, when in ARM

mode, Program Trace will be implemented using Branch History/Predicate

Instruction Messages. When in Thumb mode, the user can select between

traditional Program Trace using Direct/Indirect Branch Messages, or

Branch History Messages.

If the Branch History method is selected in Thumb mode, the shaded

TCODES above will not be messaged out.

Program Trace –

Program

Correlation

Message

TCODE

fixed

TCODE number = 33

SRC

fixed

source processor identifier (multiple Nexus configuration)

ECODE

fixed

event correlated with program flow (Refer to Table 11-5)

I-CNT

variable

# sequential instructions executed since last taken branch

HIST

variable

branch / predicate instruction history

Table 11-2. Error Code Encoding (TCODE = 8)

Error Code

Description

00000

Ownership Trace overrun

00001

Program Trace overrun

00010

Data Trace overrrun

00011

Read/write access error

00101

Invalid access opcode (Nexus Register unimplemented)

00110

Watchpoint overrun

00111

(Program Trace or Data Trace) & Ownership Trace overrun

01000

(Program Trace or Data Trace or Ownership Trace) & Watchpoint overrun

01001–10111

Reserved

11000

BTM lost due to collision w/ higher priority message

11001–11111

Reserved

Table 11-3. Watchpoint Source Encoding (TCODE = 15)

Watchpoint Code

Description

xxxx xxx1

ARM7 Watchpoint 0

xxxx xx1x

ARM7 Watchpoint 1

xxxx x1xx

Nexus Watchpoint 1

Table 11-1. Public TCODEs Supported (Continued)

Message Name

Minimum

Packet

Size (bits)

Maximum

Packet

Size (bits)

Packet

Name

Packet

Type

Packet Description

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