Specifications

Memory Replacement Instructions for the Network Processing Engine and Input/Output Controller 35

Installing New SDRAM DIMMs

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.

With the network processing engine in the same orientation as the previous procedure, install the

DIMM in the DIMM socket, as described in the following procedure:

Step 1 Remove the new DIMM from its antistatic container.

Note Hold the 64 MB DIMM component side down.

Step 2 Hold the DIMM component side up between your thumbs and foreﬁngers. (See

Figure 25.)

Step 3 Slide the DIMM straight into the socket and insert the connector edge into the socket.

Note The SDRAM DIMM sockets on the NPE-175, NPE-225, and NPE-300 are parallel

to the circuit board. They are not tilted at an angle.

Caution When inserting the DIMM, use ﬁrm but not excessive pressure. If you damage a socket,

you will have to return the NPE-300 to the factory for repair.

Step 4 Gently push the DIMM into the socket until the socket tabs close over the ends of the

DIMM. (See Figure 26.) If necessary, rock the DIMM gently back and forth to seat it

properly.

Figure 26 Inserting the DIMM

Step 5

When the DIMM is installed, check to see it is seated properly. If the DIMM appears

misaligned, carefully remove it and reseat it in the socket. Push the DIMM ﬁrmly back

into the socket until ﬁrst one and then the other socket tab moves into place.

This completes the DIMM replacement procedure.

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