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Figure 3

Screw

Step 7

When you are ready to replace the cover, refer to the section "Replacing the Cover" later in this

document.

If you are replacing DRAM SIMMs, continue with the next section, "Upgrading DRAM." If you are

upgrading your Flash memory, continue with the section "Upgrading Flash Memory" later in this

document.

Upgrading DRAM

This section describes how to upgrade DRAM on the system card. You might need to upgrade

DRAM for the following reasons:

•

You have upgraded to a new Cisco Internetwork Operating System (Cisco IOS) feature set or

release.

•

You are using very large routing tables or many protocols (for example, when the router is set up

as part of both a large external network and your internal network).

Cisco 3620 DRAM

The Cisco 3620 router contains four 72-pin single SIMM sockets (or banks) for DRAM, numbered

0 through 3. (See Figure 4.) Each socket can be ﬁlled with a single 32-bit-wide, 72-pin DRAM

SIMM. You can use the memory-size iomem software command to conﬁgure DRAM as a mixture

of shared memory, which is used for data transmitted or received by network modules and WAN

interface cards, and primary or main memory, which is reserved for the CPU. For further information

about this command, refer to the Cisco IOS conﬁguration guides and command references.

Note

Removing the Cisco 3640 Cover

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Lift the cover free and set it aside.

DRAM in the Cisco 3620 supports only single-bank SIMMs and 32-bit operation.

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Cisco 3600 Series Memory Upgrade Configuration Note

Upgrading DRAM