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May 2010 Doc ID 14204 Rev 2 1/22
AN2674
Application note
PCB layout guidelines for SPEAr3xx
Introduction
SPEAr3xx is a 15 x15 mm LFBGA289 device family with 0.8 mm ball pitch. The SPEAr3xx
family includes SPEAr300, SPEAr310 and SPEAr320.
SPEAr3xx devices all feature the ARM926 core running at up to 333 MHz, an external
DDR2 memory interface and a configurable set of powerful on-chip peripherals.
This application note provides guidelines for successfully designing the PCB layout for
SPEAr3xx applications. It covers the following main topics:
■ Power integrity
■ DDR memory interface
■ USB signals
■ GPIO/CLD signals
■ External clock
Placement guidelines for the decoupling capacitors are provided in Appendix A.
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