Cisco Systems 1600

Module − SIMM (72−pin, 60 ns, with or without parity). If SIMM is non−parity, total DRAM can be up to 18

MB. If SIMM is with parity, total DRAM can be up to 16 MB (on−board 2 MB will be disabled).

Note: The Cisco 1605−R Series Router has 8 MB on−board. Therefore, total DRAM can be up to 24 MB on

that router. For more information, see Comparison of Cisco 1601, Cisco 1604, and Cisco 1605−R Memory

Architectures.

To install or replace the DRAM, see Installing or Replacing the DRAM SIMM in Cisco 1600 Series Routers.

PCMCIA Flash is the only way to permanently store and move a complete Cisco IOS software image,

backup configurations, or any other files.

PCMCIA Flash on the Cisco 1600 Series router is implemented using one slot for Fast PC cards (up to

16MB).

The PCMCIA Flash card on the Cisco 1600 Series router uses the Filesystem Class "B". This is the same type

used for the Cisco 1000 Series Router and Cisco 3600 Series Router. For PCMCIA format compatibility

information, see PCMCIA Filesystem Compatibility Matrix.

NVRAM is used for writeable permanent storage of the startup configuration. It is also used for permanent

storage of hardware revision and identification information, as well as Media Access Control (MAC)

addresses for LAN interfaces. It is a battery−backed Static RAM (SRAM). The lifespan of NVRAM is

specified in the maximum number of writes and a maximum time limit. NVRAM size is 8 KB.

BOOT ROM is an Erasable programmable read−only memory (EPROM) used for permanently storing

startup diagnostic code (ROM Monitor), and RxBoot. Boot ROM size is 2 MB. The Cisco 1600 Series Router

runs RxBoot from Boot ROM.

For information on upgrading the Boot ROM, see Upgrading the Boot ROMs in Cisco 1600 Series Routers.

Registers are small, fast memory units used for storing special purpose information, such as interrupt status,

currently executing instruction, and so on. The location of registers depends upon their use. For example, the

main processor contains the instruction register and other control registers. UART contains its own status

also contains general purpose registers for integer and floating point data used in an instruction execution.

The different types of memory can be seen in the output of the show version command:

Router−1600#show version

Cisco Internetwork Operating System Software

IOS (tm) 1600 Software (C1600−SY−L), Version 12.1(7), RELEASE SOFTWARE (fc1)

Compiled Thu 22−Feb−01 12:56 by kellythw

Image text−base: 0x08041D10, data−base: 0x02005000

ROM: System Bootstrap, Version 11.1(7)AX [kuong (7)AX], EARLY DEPLOYMENT

RELEASE SOFTWARE (fc2)

ROM: 1600 Software (C1600−BOOT−R), Version 11.1(7)AX, EARLY DEPLOYMENT RELEASE

SOFTWARE (fc2)

Router−1600 uptime is 2 hours, 49 minutes

System returned to ROM by reload

System image file is "flash:/c1600−sy−l.121−7.bin"

cisco 1603 (68360) processor (revision C) with 13824K/4608K bytes of memory.

Processor board ID 05317740, with hardware revision 00000000

Cisco 1600 Series Router Architecture