MAC7200 datasheet(10/976 Pages) FREESCALE

10 / 976 page

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

9.18.2

“Normal” Boot with a Bootloader ...............................................................................124

Chapter 10

ARM7TDMI-S Core

10.1

Introduction......................................................................................................................127

10.2

ARM7 Features................................................................................................................127

10.3

ARM7 Implementation ....................................................................................................127

10.4

ARM7 External Pins ........................................................................................................128

10.5

ARM7 Bus Aborts ...........................................................................................................128

10.6

ARM7 Application Usage ...............................................................................................128

10.6.1

Register Bank Initialization .........................................................................................128

Chapter 11

A7S Nexus3 Module

11.1

Introduction......................................................................................................................129

11.1.1

A7S Nexus3 Overview ................................................................................................130

11.1.2

Nexus Feature List .......................................................................................................130

11.1.3

Modes of Operation .....................................................................................................131

11.1.3.1

Reset ........................................................................................................................131

11.1.3.2

Normal .....................................................................................................................131

11.1.3.3

Disabled ...................................................................................................................131

11.1.4

TCODEs supported......................................................................................................131

11.2

Nexus Protocol.................................................................................................................135

11.3

Nexus Implementation .....................................................................................................135

11.3.1

Nexus Port Replacement..............................................................................................136

11.3.2

TAP Controller Encodings...........................................................................................136

11.4

Nexus Integration.............................................................................................................137

11.4.1

Nexus Integration and SoC Security............................................................................138

11.4.2

Nexus Integration and FlexBus Port Sizing.................................................................138

11.4.3

Nexus Integration and Port Control .............................................................................138

11.5

Nexus External Pins.........................................................................................................139

11.5.1

MDO - Message Data (Output) ...................................................................................139

11.5.2

MSEO - Message Start/End (Active low output) ........................................................139

11.5.3

EVTI - Event In (Active low input).............................................................................139

11.5.4

EVTO - Event Out (Active low output).......................................................................139

11.5.5

RDY - DMA Ready (Active low output).....................................................................140

11.5.6

MCKO - Message Clock (Output)...............................................................................140

11.6

Nexus Bus Aborts ............................................................................................................140

11.7

Nexus Differences from MAC71xx.................................................................................140

11.8

Nexus Application Usage ................................................................................................140

11.8.1

Nexus Configuration....................................................................................................140

11.8.2

Programming the PCR Register...................................................................................141

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