P&E Microcomputer Systems USB-ML-PPCNEXUS Summary Manual

P&E Microcomputer Systems, Inc.

P.O. Box 2044, Woburn, MA 01888, USA

TEL: [phone] FAX: [phone] http://www.pemicro.com

USB-ML-PPCNEXUS, PowerPC Nexus Multilink Rev. A (USB 2.0)

Technical Summary

Document # PE3356, Version 1.1

1. Introduction

2. Usage Of The PowerPC Nexus Multilink Interface

3. Driver Installation On Windows XP/2000/2003/Vista

4. Computers Running Windows 95, 98, ME, or NT

5. Using A USB Hub

6. Connecting To The Target

7. Startup Reset Sequence

8. Interface Libraries

9. Firmware Updates

1.0 Introduction

P&E’s USB POWERPC NEXUS MULTILINK Interface provides access to the JTAG/Nexus port on
Freescale PowerPC MPC55xx processors. It is the hardware interface between a USB port on a Windows
2000, 2003, XP, or Vista machine and the standard 14-pin “Berg” debug connector on the target. By
using the USB PowerPC Nexus Multilink, the user can take advantage of the JTAG/Nexus debug mode to
halt normal processor execution and use a PC to control the processor. The user can then directly control
the target’s execution, read/write registers and memory values, debug code on the processor, and
program internal or external FLASH memory devices by using the appropriate software packages. The
pin-out of the connector as specified by Freescale is:

2.0 Usage Of The USB PowerPC Nexus Multilink Interface

The USB POWERPC NEXUS MULTILINK can communicate with a PowerPC 55xx processor.

The Multilink interface will work with targets whose processor power supply is in the range of 1.8V to

5.25V. The Multilink interface derives its power from the USB port, and as such draws less than 10mA
from the target.

The USB PowerPC Nexus Multilink has a female, Type B USB connector. Use a Type A to Type B USB
extension cable to connect the interface to the PC. The USB PowerPC Nexus Multilink is a high-power
USB device. If a USB HUB is used, it must be a self powered hub (i.e., with a power supply). By default,
the USB protocol used is 2.0.

There are two LEDs located on top of the USB PowerPC Nexus Multilink interface. The Blue LED
indicates that the Multilink interface is powered and running. The Yellow LED indicates that target
power has been detected.

The 14-pin ribbon cable, which allows connection to the target debug connector, is fixed within the
Multilink housing. PIN 1 is indicated by the red stripe running down one side of the ribbon cable.