Memory Systems Overview - Cisco 7200 Series Instructions Manual

Memory Systems Overview

Memory Systems Overview
The Cisco 7200 series memory systems are divided between the I/O controller and the network
processing engine. The memory systems provide the following functions:
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Table 1 lists the Cisco 7200 series processor and memory specifications. Table 2 lists the network
processing engine factory-installed DRAM configurations and their product numbers. Figure 5
shows the I/O controller with the optional Fast Ethernet port. Figure 6 shows the network processing
engine.
Table 1
Component
Network processing engine
I/O Controller
1. RISC—reduced instruction set computing
2. DRAM—dynamic random-access memory
3. SRAM—static random-access memory
4. ROM—read-only memory
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Main memory (DRAM)—Stores the running configuration and routing tables. The
Cisco Internetwork Operating System (Cisco IOS) software executes from main memory.
Shared memory—Used for packet buffering by the router's network interfaces.
Flash memory SIMM—Stores the boot helper software. The boot helper image allows you to
boot the router when Flash memory does not contain a valid system image.
Flash memory card(s)—Stores the default Cisco IOS software image.
Erasable programmable read-only memory (EPROM)-based memory—The ROM monitor
permits you to boot the Cisco IOS image from Flash memory if a boot helper image is not present
in boot Flash memory.
Nonvolatile random-access memory (NVRAM)—Stores the system configuration,
environmental monitoring logs, and the virtual configuration register.
Cisco 7206 Processor and Memory Specifications
Description
Processor
Main memory (DRAM)
SRAM
Unified secondary cache
Flash SIMM
Flash memory card
Nonvolatile RAM
Boot ROM
Specification
150-MHz Orion RISC
2
16 to 128 MB
3
1 MB
512 KB
4 MB
8 to 20 MB
128 KB
4
256 KB
Location
1
Socket U201
Bank 1: U12 and U4
Bank 0: U25 and U18
Sockets U700 through U703
Sockets U800 through U803
U2, U10, U14, and U26
Socket U99
PCMCIA
Slot 0 and Slot 1
Socket U41
Socket U20