Cisco Systems NPE-175 manual NPE-225

Chapter 2 NPE-175 and NPE-225 Overview

NPE-175 and NPE-225 Description and Overview

Figure 2-2 NPE-225

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				NETWORK PROCESSING ENGINE-200	66417
	4	5	6
1	Network controller board		6	Handle
2	System controller		7	Midplane connectors
3	Processor engine board		8	Boot ROM (U1)
4	Captive installation screw		9	Temperature sensor
5	RM5271 microprocessor		10	SDRAM DIMM (U15)

The NPE-175 and NPE-225 consist of the following components:

•Reduced instruction set computing (RISC) microprocessor

–The NPE-175 has an RM5270 microprocessor that operates at an internal clock speed of 200 MHz.

–The NPE-225 has an RM5271 microprocessor that operates at an internal clock speed of 262 MHz.

•System controller

The system controller provides hardware logic to interconnect the processor, DRAM, and the PCI-based system backplane bus. The NPE-175 and NPE-225 have one system controller that provides processor access to the two midplane and single I/O controller peripheral component interconnect (PCI) buses. The system controller also allows port adapters—on either of the two midplane PCI buses—access to SDRAM.

•Upgradable memory modules

The NPE-175 and NPE-225 use SDRAM for providing code, data, and packet storage.

•Cache memory

The NPE-175 and NPE-225 have unified cache SRAM that functions as the secondary cache for the microprocessor. (The primary cache is within the microprocessor.)

•Two environmental sensors for monitoring the cooling air as it leaves the chassis

Network Processing Engine and Network Services Engine Installation and Configuration

OL-4448-12 2-3