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Cisco 3600 Series Routers Hardware Installation Guide
OL-2056-05
Chapter 1 Overview of Cisco 3600 Series Routers
Memory
Memory
This section describes the various types of memory that may be present in a Cisco 3600 series router.
Memory Types
Cisco 3600 series routers support the following types of memory:
• DRAM or SDRAM—Stores the running configuration and routing tables, and is used for packet
buffering by the router’s network interfaces. The Cisco IOS software executes from DRAM.
• Nonvolatile random-access memory (NVRAM)—Stores the system configuration file and the
virtual configuration register. (For more information, see Appendix C, “Configuration Register.”)
• Flash memory—Stores the operating system software image. You can also add Flash memory on
PCMCIA cards and compact Flash cards, depending on the router.
• EPROM-based memory—Stores the ROM monitor, which allows you to boot an operating system
software image from Flash memory or PCMCIA memory.
Memory Installation Documentation
For information about installing DRAM, SDRAM, NVRAM, and Flash memory SIMMs, refer to the
following hardware configuration note:
• Upgrading System Memory in Cisco 3600 Series Routers
For information about installing Flash memory PCMCIA cards, refer to the following hardware
configuration note:
• Installing and Configuring Flash Memory Cards in Cisco 3600 Series Routers
For information about installing compact Flash memory cards, refer to the following hardware
configuration note:
• Installing and Formatting Cisco 2691, Cisco 3631 and Cisco 3700 Compact Flash Memory Cards
Memory Specifications
Table 1-1 through Table 1-4 list processor and memory specifications for the routers.
Table 1-1 Cisco 3620 Router Processor and Memory Specifications
Description Specification
Processor 80-MHz IDT
1
R4700 RISC
1. IDT = Integrated Device Technology.
DRAM (main plus shared) 4 to 64 MB
NVRAM 32 KB
Flash memory (SIMM) 4 to 32 MB
Flash memory (PCMCIA) 2 to 40 MB
Boot ROM 512 KB
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