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Intel® PXA255 Processor Developer’s Manual 1-1
Introduction 1
This document applies to the Intel® PXA255 Processor (PXA255 processor). It is an application
specific standard product (ASSP) that provides industry-leading MIPS/mW performance for
handheld computing applications. The processor is a highly integrated system on a chip and
includes a high-performance low-power Intel® XScale™ microarchitecture with a variety of
different system peripherals.
The PXA255 processor is a 17x17mm 256-pin PBGA package configuration for high performance.
The 17x17mm package has a 32-bit memory data bus and the full assortment of peripherals.
1.1 Intel® XScale™ Microarchitecture Features
The Intel® XScale™ microarchitecture provides these features:
• ARM* Architecture Version 5TE ISA compliant.
— ARM* Thumb Instruction Support
— ARM* DSP Enhanced Instructions
• Low power consumption and high performance
• Intel® Media Processing Technology
— Enhanced 16-bit Multiply
— 40-bit Accumulator
• 32-KByte Instruction Cache
• 32-KByte Data Cache
• 2-KByte Mini Data Cache
• 2-KByte Mini Instruction Cache
• Instruction and Data Memory Management Units
• Branch Target Buffer
• Debug Capability via JTAG Port
Refer to the Intel® XScale™ Microarchitecture for the Intel® PXA255 Processor User’s Manual
for more details.
1.2 System Integration Features
The processor integrates the Intel® XScale™ microarchitecture with this peripheral set:
• Memory Controller
• Clock and Power Controllers
• Universal Serial Bus Client