Freescale Semiconductor, Inc.
Advance Information
MPC8255EC/D
Rev. 0.4, 5/2002
MPC8255
Hardware Specifications
This document contains detailed information on power considerations, DC/AC electrical
characteristics, and AC timing specifications for the MPC8255 PowerQUICC II
communications processor.
The following topics are addressed:
Topic Page
Section 1.1, Features 2
Section 1.2, Electrical and Thermal Characteristics 5
Section 1.2.1, DC Electrical Characteristics 5
Section 1.2.2, Thermal Characteristics 9
Section 1.2.3, Power Considerations 9
Section 1.2.4, AC Electrical Characteristics 10
Section 1.3, Clock Configuration Modes 16
Section 1.3.1, Local Bus Mode 16
Section 1.4, Pinout 20
Section 1.5, Package Description 33
Section 1.6, Ordering Information 35
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Features
Figure 1 shows the block diagram for the MPC8255.
16 Kbytes
I-Cache
I-MMU
System Interface Unit
(SIU)
60x Bus
G2 Core
16 Kbytes
Bus Interface Unit
D-Cache
Local Bus
60x-to-Local
D-MMU
32 bits, up to 83 MHz
Bridge
Memory Controller
Communication Processor Module (CPM)
Clock Counter
Timers
32 Kbytes Serial
Interrupt
Dual-Port RAM DMAs
Controller
System Functions
Parallel I/O
32-bit RISC Microcontroller
4 Virtual
and Program ROM
Baud Rate IDMAs
Generators
2
MCC2 FCC1 FCC2 SCC1 SCC2 SCC3 SCC4 SMC1 SMC2 SPI
I C
Time Slot Assigner
Serial Interface
Non-Multiplexed
2 MII 2 UTOPIA
4 TDM Ports
I/O
Ports Ports
Figure 1. MPC8255 Block Diagram
1.1 Features
The major features of the MPC8255 are as follows:
Footprint-compatible with the MPC8260
Dual-issue integer core
A core version of the EC603e microprocessor
System core microprocessor supporting frequencies of 150200 MHz
Separate 16-Kbyte data and instruction caches:
Four-way set associative
Physically addressed
LRU replacement algorithm
PowerPC architecture-compliant memory management unit (MMU)
Common on-chip processor (COP) test interface
High-performance (4.45.1 SPEC95 benchmark at 200 MHz; 280 Dhrystones MIPS at
200 MHz)
Supports bus snooping for data cache coherency
Floating-point unit (FPU)
MPC8255 Hardware Specifications
PRELIMINARYSUBJECT TO CHANGE WITHOUT NOTICE
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc...