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User Guide XB1 COM Express Module
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Installing or Replacing the Memory Modules
Note: If you decide to replace the memory, observe the precautions in 'Before You Begin'
By default, the XB1 COM Express Module comes fully equipped and tested with two DDR2 SDRAM
memory modules. So normally there should be no need to install the memory modules.
The XB1 COM Express Module requires at least one PC2-3200/4200 (400/533MHz) DDR2 SDRAM SO-
DIMM module. For optimum performance two SO-DIMMs of equal capacity are recommended.
Further it is highly recommended that Serial Presence Detect (SPD) SO-DIMMs be used, since this
allows the chipset to accurately configure the memory settings for optimum performance.
A replacement memory module must match the 200-pin SO-DIMM form factor (known from
Notebook PCs), DDR2, V
CC
=1.8V, PC2-3200/PC2-4200 (400/533MHz), on-die termination (ODT),
unbuffered, non-ECC style. Suitable modules are available up to 1GB each. The i915GM supports
modules of up to a maximum of 14 address lines (A0...A13). Memory modules organized by more
than14 address lines are not suitable.
Replacement of the Battery
When the XB1 is removed from the carrier board, an optional on-board battery maintains the voltage
to run the time-of-day clock and to keep the values in the CMOS RAM over ~30 days. The battery is
rechargeable und should last during the lifetime of the XB1 COM Express Module. For replacement,
the old battery must be desoldered, and the new one soldered. We suggest that you send back the
board to EKF for battery replacement.
Warning
Danger of explosion if the battery is incorrectly replaced. Replace only with the same or
equivalent type. Do not expose a battery to fire.