MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 1-1
Chapter 1 Overview
The PowerQUICC II™ is a versatile communications processor that integrates on one chip a
high-performance PowerPC™ RISC microprocessor, a very flexible system integration unit, and many
communications peripheral controllers that can be used in a variety of applications, particularly in
communications and networking systems.
The G2 core is an embedded variant of the MPC603e™ microprocessor with 16 Kbytes of instruction
cache and 16 Kbytes of data cache. The system interface unit ( SIU) consists of a flexible memory
controller that interfaces to almost any user-defined memory system, a 60x-to-PCI bus bridge (MPC8250,
MPC8265, and MPC8266 only), and many other peripherals making this device a complete system on a
chip.
The communications processor module (CPM) includes all the peripherals found in the PowerQUICC
(MPC860), with the addition of three high-performance communication channels that support new
emerging protocols (for example, 155-Mbps ATM and Fast Ethernet). The PowerQUICC II has dedicated
hardware that can handle up to 256 full-duplex, time-division-multiplexed logical channels.
This document describes the functional operation of PowerQUICC II, with an emphasis on peripheral
functions. Chapter2, “G2 Core,” is an overview of the microprocessor core; detailed information about
the core can be found in the G2 Core Reference Manual (order number: G2CORERM/D).

1.1 Features

The following is an overview of the PowerQUICC II feature set:
Dual-issue integer core
A core version of the MPC603e microprocessor
System core microprocessor supporting the following frequencies:
133–200 M Hz (.29µm (HiP3) devices)
150–300 M Hz (.25µm (HiP4) devices)
Separate 16-Kbyte data and instruction caches:
F our-way set associ ati ve
Physically addressed
LRU r eplacement algorithm
PowerPC architecture-compliant memory management unit (MMU)
Common on-chip processor (COP) test interface
Supports bus snooping for cache coherency