Cisco Systems 7200 VXR manual 1-12, System controller

Chapter 1 Cisco 7200 VXR Product Overview

Field-Replaceable Units

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

–The NPE-100 and NPE-150 have an R4700 microprocessor that operates at an internal clock speed of 150 MHz.

•System controller

–The NPE-G2 has one system controller that provides processor access to the three midplane PCI buses, and also holds the system memory and environmental monitoring functions.

–The NPE-G1 BCM 1250 maintains and executes the system management functions for the Cisco 7200 VXR routers and also holds the system memory and environmental monitoring functions.

–The NSE-1 has one system controller that provides processor access to the midplane and single I/O controller PCI buses. The system controller also allows port adapters on either of the two midplane PCI buses to access SDRAM.

–The NPE-400 has one system controller that provides system access.

–The NPE-300 has two system controllers that provide processor access to the two midplane and single I/O controller PCI buses. The system controller also allows port adapters on either of the two midplane PCI buses to access SDRAM.

–The NPE-175 and NPE-225 have one system controller that provides processor access to the two midplane and single I/O controller PCI buses. The system controller also allows the

port adapters on either of the two midplane PCI buses to access SDRAM.

–The NPE-100, NPE-150, and NPE-200 have a system controller that uses direct memory access (DMA) to transfer data between DRAM and packet SRAM on the network processing engine.

•Upgradable memory modules

–The NPE-G2 uses SDRAM for storing all packets received or sent from network interfaces, The SDRAM also stores routing tables and network accounting applications. A single SDRAM memory array in the system allows concurrent access by port adapters and the processor.

–The NPE-G1 uses SDRAM for storing all packets received or sent from network interfaces. The SDRAM also stores routing tables and network accounting applications. Two independent SDRAM memory arrays in the system allow concurrent access by port adapters and the processor.

–The NSE-1 uses SDRAM for providing code, data, and packet storage.

–The NPE-400 uses SDRAM for storing all packets received or sent from network interfaces. The SDRAM memory array in the system allows concurrent access by port adapters and the processor.

–The NPE-300 uses SDRAM for storing all packets received or sent from network interfaces. The SDRAM also stores routing tables and network accounting applications. Two independent SDRAM memory arrays in the system allow concurrent access by port adapters and the processor.

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

–The NPE-100, NPE-150, and NPE-200 use DRAM for storing routing tables, network accounting applications, packets of information in preparation for process switching, and packet buffering for SRAM overflow (except in the NPE-100, which contains no packet SRAM). The standard configuration is 32 MB, with up to 128 MB available through single in-line memory module (SIMM) upgrades.

•Packet SRAM for storing packets of information in preparation for fast switching

Cisco 7200 VXR Installation and Configuration Guide

1-12 OL-5013-09