Specifications

Memory Replacement Instructions for the Network Processing Engine and Input/Output Controller 33

Removing SDRAM DIMMs

The procedures in this section are required only if you have an NPE-175, NPE-225, or NPE-300 and

need to upgrade or replace the SDRAM DIMMs. On the NPE-175 and NPE-225, the SDRAM

DIMMs are located in the following socket: U15. The two user-conﬁgurable SDRAM DIMMs on

the NPE-300 are located in the following sockets: U45 and U44.

Note The NPE-300 contains two banks of SDRAM. Both SDRAM banks are used for all packet

memory requirements; however, bank 0 is used exclusively for packet memory and is set at a ﬁxed

conﬁguration in the factory.

Bank 1 contains two user-conﬁgurable SDRAM slots, DIMM slot 2 and DIMM slot 3 (see Figure 7).

Both slots in bank 1 can be populated by DIMMs of different sizes; however, the size of the DIMM

in slot 2 must be greater than or equal to the size of the DIMM in slot 3, and the size of the DIMM

in slot 3 can be zero.

Note Use only SDRAM DIMMs supplied by Cisco Systems.

Use the following procedure to remove the existing DIMM:

Step 1 Turn off the system power and remove the network processing engine from the system.

(Follow the steps in the “Removing the Network Processing Engine” section on page 28.)

Step 2 Place the network processing engine on an antistatic mat or pad and ensure that you are

wearing an antistatic device, such as a wrist strap.

Step 3 Locate the DIMM and position the network processing engine so that you are facing the

DIMM module you want to remove.

Step 4 Open the DIMM socket tabs on the DIMM to release the DIMM from the socket. (See

Figure 23.) The DIMM is under tension in the socket; therefore, the DIMM might release

from the socket with some force.

Figure 23 Opening DIMM Socket Tabs

Step 5

With the DIMM socket tabs open, grasp the ends of the DIMM between your thumbs and

foreﬁngers and pull the DIMM completely out of the socket. (See Figure 24.)

SDRAM DIMM

13339

Pull the tabs away with

your thumbs, bracing your

forefingers against the

DIMM socket sides.