Kontron JRexplus-LX - Manual (Page 15)

KTD-S0001-C Page 11 System Memory
JRexplus LX User's Guide
5 System Memory
The JRexplus LX uses only 200 pin Small Outline Dual Inline Memory Modules (SODIMMs). One socket is
available for 2.5V/2.6V unbuffered DDR200 up to DDR400 SDRAM of up to 1 GB.
The total amount of memory available on the SDRAM module is used for main memory and graphic memory
on the JRexplus LX. 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 254 MB of system memory are used as graphic memory.
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 X2.
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 LX board. Only Universal and 3.3V add on
cards are permitted. V
I/O
is open or 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. The LX chipset does only support a 3.3V PCI bus.
The jumper JP10 switches 3.3V to V
I/O
(Default: Open).
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.
Four slots are available via the connector X2 (IDSEL, /IRQ) but only three slots are busmaster capable.