•PCI bus expansion card power
•PCI bus signaling levels
Slot Selection Switches
Unlike PC/104 cards,
Note This requirement means that all
The “slot” setting method may vary from manufacturer to manufacturer, but the concept is the same. The CPU is designed to provide the correct delay to the clock signals to compensate for the bus length. The correct switch setting ensures the proper clock delay setting, interrupt assignment, and bus grant/request channel assignment. Refer to the expansion board’s manual for the proper settings. Each expansion card must be in a different slot.
PCI Bus Expansion Card Power
+5 Volt DC
The +5 V power pins on the
+3.3 Volt DC
The +3.3V pins on the PCI bus can be configured to be supplied from the power connector (CN3) or the onboard +3.3V power supply. The factory default configuration connects the +3.3 V pins on the PCI bus to the auxiliary power connector (CN3). This is to ensure that the cpuModule’s onboard +3.3V supply will not supply power to the
For more information on configuring the +3.3V pins on the PCI bus, contact RTD Technical Support.
PCI Bus Signaling Levels
The PCI bus can operate at +3.3 V or +5 V signaling levels. The default PCI bus signaling level is +3.3 V. For more information, contact RTD Technical Support.
WARNING You will have to ensure that all your expansion cards can operate together at a single signaling level.
Chapter 2: Getting Started 21 |