MAC7200 datasheet(169/976 Pages) FREESCALE

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MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

Chapter 8

Debug

8.1

Debug Introduction

The MAC7200 family of devices offers debugging with the ARM Core’s EmbeddedICE and a NEXUS 3

interface. EmbeddedICE offers debug features such as setting Breakpoints or Watchpoints, modifying and

reading memory contents. EmbeddedICE uses the standard JTAG serial interface and Test Access Port

(TAP), and is compatible with existing ARM tool chains. The NEXUS interface provides real time

program and data trace capability and also uses the JTAG port, as well as providing an auxiliary port. The

auxiliary port can be provided in two pin positions depending on the device and package. Please refer to

Chapter 11, “A7S Nexus3 Module” for more information on configuring and using the Nexus interface.

For details on the E-ICE interface please refer to Debugging Your System in the ARM7TDMI-S Users

Manual, or ARM Application Note 31’ Using Embedded’.

8.2

Debug Features

•

Customer visible SC4 Debug Register with the following functionality:

— JTAG Lockout Recovery

— Device ID

— Debug Reset

— Chip Status

— Core Run Control

•

Please refer to Section 10.2, “ARM7 Features” for a list of debug related ARM7 features.

•

Please refer to Section 11.1.2, “Nexus Feature List” for a list of debug related Nexus features.

8.3

Debug Protocol

The JTAG interface and TAP state machine follow the IEEE 1149.1-1990 protocol. Note that the

MAC72xx does not support JTAG, but simply uses the JTAG protocol as a standard debug interface.

8.4

Debug Implementation

8.4.1

JTAG Interface

The JTAG interface on the MAC72xx is accessed using the following pins:

•

TCK - Input Clock

•

TMS - Input Mode Select

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