MAC7200 datasheet(11/976 Pages) FREESCALE

11 / 976 page

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

11.8.3

Resetting Nexus ...........................................................................................................141

11.8.4

Enabling Nexus............................................................................................................141

11.8.5

Disabling Nexus...........................................................................................................141

11.8.6

Nexus Development Status (DS) Register...................................................................142

11.8.7

Unintended Activation of Nexus .................................................................................142

11.9

External Signal Description .............................................................................................143

11.9.1

Functional Description.................................................................................................143

11.9.2

Pins Implemented ........................................................................................................143

11.9.3

Pin Protocol..................................................................................................................144

11.9.4

Rules for Output Messages ..........................................................................................146

11.9.5

Examples......................................................................................................................146

11.10

A7S Nexus3 Programmers Model ...................................................................................148

11.10.1

JTAG ID Register ........................................................................................................148

11.10.2

Nexus3 Register Map...................................................................................................150

11.10.3

A7S Nexus3 Register Definitions................................................................................151

11.10.3.1

Client Select Control (CSC) ....................................................................................151

11.10.3.2

Development Control (DC) .....................................................................................151

11.10.3.3

Development Status (DS) ........................................................................................152

11.10.3.4

User Base Address (UBA).......................................................................................153

11.10.3.5

Read/Write Access Control/Status (RWCS) ............................................................154

11.10.3.6

Read/Write Access Data (RWD) .............................................................................155

11.10.3.7

Read/Write Access Address (RWA) ........................................................................156

11.10.3.8

Watchpoint Trigger (WT) ........................................................................................156

11.10.3.9

Data Trace Control (DTC) .......................................................................................157

11.10.3.10

Data Trace Start Address (DTSA1, DTSA2)...........................................................158

11.10.3.11

Data Trace End Address (DTEA1, DTEA2) ...........................................................159

11.10.3.12

Breakpoint / Watchpoint Control (BWC1, BWC2) .................................................160

11.10.3.13

Breakpoint / Watchpoint Control (BWC3-6)...........................................................161

11.10.3.14

Breakpoint / Watchpoint Address (BWA1-6) ..........................................................161

11.10.3.15

Breakpoint / Watchpoint Address Mask (BWAM1, BWAM2)................................162

11.10.3.16

Breakpoint / Watchpoint Data (BWD1, BWD2) .....................................................162

11.10.3.17

Breakpoint / Watchpoint Data Mask (BWDM1, BWDM2) ....................................162

11.10.3.18

Port Configuration (PCR) ........................................................................................163

11.10.4

Nexus Register Access via JTAG ................................................................................164

11.10.5

Programming Considerations (RESET).......................................................................166

11.11

Functional Description.....................................................................................................166

11.11.1

Ownership Trace ..........................................................................................................166

11.11.1.1

Ownership Trace Messaging (OTM) .......................................................................166

11.11.1.2

OTM Error Messages ..............................................................................................166

11.11.1.3

OTM Flow ...............................................................................................................167

11.11.2

Program Trace..............................................................................................................167

11.11.2.1

Branch Trace Messaging (BTM) .............................................................................167

11.11.2.1.1

ARM7 Indirect Branch Message Instructions .....................................................168

11.11.2.1.2

ARM7 Direct Branch Message Instructions........................................................168

11.11.2.1.3

BTM in ARM mode ............................................................................................169

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