MAC7200 datasheet(254/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

176

Freescale Semiconductor

Figure 11-36. Program Trace – Indirect Branch Message (History)

Figure 11-37. Program Trace – Direct Branch (Traditional) and Error Messages

Figure 11-38. Program Trace – Indirect Branch w/ Sync. Message (Traditional)

11.11.3 Data Trace

This section deals with the Data Trace mechanism supported by the A7S Nexus3 module. Data Trace is

implemented via Data Write Messaging (DWM) and Data Read Messaging (DRM), as per the IEEE-ISTO

5001 standard.

11.11.3.1 Data Trace Messaging (DTM)

Data Trace Messaging for ARM7 is accomplished by snooping the ARM7 bus, and storing the information

for qualifying accesses (based on enabled features and matching target addresses). The A7S Nexus3

module traces all data access that meet the selected range and attributes.

TCODE = 28

source processor = 0000

# of sequential instructions = 0

relative address = 8'ha5

branch history = 8'b10100101 (w/ stop)

MCKO

MSEO_B

MDO[1:0]

Direct Branch

Error

DBM:

TCODE = 3

source processor = 0000

# of sequential instructions = 3

Error:

TCODE = 8

source processor = 0000

error code = 1 (queue overrun, BTM only)

MCKO

MSEO_B

MDO[1:0]

00 11 00 00 00 11 10 11 00 11 10 10 11

TCODE = 12

source processor = 0000

# of sequential instructions = 3

full target address = 32'hdeadface

11 01 11 10 10 10 11 01

11 00

MCKO

MSEO_B

MDO[1:0]

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