XAPP979 (v1.0) February 26, 2007 www.xilinx.com 1
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Summary This application note describes how to build a referencesystem for the On-Chip Peripheral Bus
Inter IC (OPB IIC) core using the IBM PowerPC™405 Processor (PPC405) based embedded
system in the ML403 Embedded DevelopmentPlatform. The reference system is Base System
Builder (BSB) based.
An IIC primer is given and an OPB IIC register referenceis provided. The Xilinx Microprocessor
Debugger (XMD) commands are used for verifying that the OPB IIC core operates correctly.
Severalsoftware projects illustrate how to configure the OPB IIC core, set up interrupts, and do
read and write operations. Some of the software projects interface the OPB IIC to the
MicroChip 24LC04B serial EEPROM with an IIC interface, while others interface to the
TotalPhaseAardvark Adapter, which provides IIC master and slavefunctionality. The procedure
for using ChipScope™ to analyze OPB IIC functionality is provided. The steps used to build a
Linux kernel using MontaVista are listed. Simulation output files for analyzing basic IIC
transactions are provided.

Included

Systems This application note includes one reference system:
www.xilinx.com/bvdocs/appnotes/xapp979.zip
The project name used in xapp979.zip is ml403_ppc_opb_iic.

Required

Hardware/Tools Users must have the following tools, cables, peripherals, and licenses available and installed:
•Xilinx EDK 8.2.02i
•Xilinx ISE 8.2.03
•Xilinx Download Cable (Platform Cable USB or Parallel Cable IV)
•Monta Vista Linux v2.4 Development Kit
•Modeltech ModelSim v6.1d
•ChipScope v8.2
Application Note: Embedded Processing
XAPP979 (v1.0) February 26, 2007
Reference System: OPB IIC Using theML403 Evaluation Platform
Author: Paul Glover, Ed Meinelt, Lester Sanders
R