Kontron JRexplus-DC - Manual (Page 17)

KTD-S0008-F Page 12 System Memory
JRexplus-DC User's Guide
5 System Memory
The JRexplus-DC uses only 200 pin Small Outline Dual Inline Memory Modules (SODIMMs). One socket is
available for 1.8V unbuffered DDR2-533 SDRAM of up to 2 GB.
Memory modules with 667 MHz clock frequency can also be used. In this case the memory module is driven
with 533 MHz. It is recommended to use RAM modules which have been approved by KONTRON. Please
contact the board vendor to receive a list of approved memory modules.
The total amount of memory available on the SDRAM module is used for main memory and graphic memory
on the JRexplus-DC. Shared Memory Architecture (SMA) manages the sharing of system memory between
graphic controller and processor. Therefore the full memory size is not available for software applications.
Up to 128 MB of system memory are used as graphic memory. Depending on system memory the graphic
driver may allocate more.
Attention: KONTRON Technology A/S can't guarantee the correct functionality of theJRexplus-DC when a DDR2-module with
another frequency than 533 Mhz is used.
6 PCI Bus Expansion
A quad-row socket trough-hole connector with a 2 x 2 mm (0.79" x 0.79") pitch implements the standard
32 bit PCI bus signals. The PCI-104 bus is available through the standard connector J22.
A description of signals, including electrical characteristics and timings, is beyond the scope of this docu-
ment. Please refer to the official PCI bus and PC/104-plus specifications for more details.
Under no circumstances 5V PCI cards may be used on the JRexplus-DC board. Only Universal and 3.3V add-
on cards are permitted. V
I/O
is set to 3.3V on the PCI bus. 5V PCI add-on cards can irretrievably damage the
JRexplus board due to a short curcuit with V
I/O
. Before using a PCI add-on card please make absolutely sure
that this card is conform to these requirements.
Note: Some PCI-104 extension cards might interfere mechanically with the CPU cooler. To avoid this and to
achieve the best possible cooling perfomance the usage of a PCI-104 spacer is recommended.
Note: The usage of a PCI-104 to PCI adapter or riser card is not generally recommended. Due to consider-
able differences in between these third party adapter cards (e.g. different circuit path routing) the signal
integrity may suffer.
Attention: 5V PCI expansion cards can damage the board.