User manual

LPC3250 Developer’s Kit v2 - User’s Guide

Page 58

5.5 Handling SO-DIMM Boards

See picture below for instructions about how to mount/remove the LPC3250 OEM Board.

To install the OEM Board, align it to the socket (1). Push the board gently, and with even force

between the board edges, fully into the socket (2). Then push the board down in a rotating move (3)

until it snaps into place (4). The OEM Board shall lie flat and parallel to the base board.

To remove the OEM Board, spread the two arms of the SO-DIMM socket apart slightly. The board will

pop up (5). Gently rise the board in a rotating move (6) and then extract the board from the socket (7).

Apply even force between board edges when removing so that the board is removed parallel to the

locking arms.

Figure 34 – Instructions how to Mount/Remove the LPC4088 OEM Board

Do not forget to follow standard ESD precaution routines when mounting/removing the OEM Board.

Most signals exposed on the 200 edge contact fingers on the SO-DIMM board are unprotected.

Maintain the same electrical potential of the OEM Board (to be mounted) and the base board. Do not

touch the OEM Board edge connectors. Handle the OEM Board only by the three other edges. Also,

do not touch the components on the board.

5.6 Things to Note

This section lists things to note when using the LPC3250 OEM Board and the OEM Base Board.

5.6.1 LPC3250 Adjustable Core Voltage

The core voltage for the LPC3250 is adjustable via I2C commands sent to the LTC3447 voltage

converter. The core voltage should always be increased to 1.35 volt in order for external mobile DDR

SDRAM to function properly. Initialization code that increase the adjustable core voltage to 1.35V can

be downloaded from Embedded Artists support pages.

Note that it is the user’s responsibility not to program the LTC3447 to generate too high core

voltage, which is possible. The LTC3447 can generate voltages up to 2V, which by far exceed the

limits for the LPC3250.

5.6.2 NAND FLASH Bad Block

The NAND Flash is the K9F1G08 from Samsung and has 1 GBit capacity. The chip may include invalid

blocks when shipped from factory. A maximum of 20 invalid blocks may exist initially, i.e., 1004-1024

valid blocks. Additional invalid blocks may develop while being used. Invalid blocks are defined as

blocks that contain one or more bad bits. Do not erase or program factory-marked bad blocks. More