TME-EPIC-HURQM-R2V1.docx
Revision 2.1
Page 21 of 52
3.9
PC/104-Plus Bus Interface
The PC/104-Plus bus is a modification of the standard PCI bus. It allows all of the PC/104 features to be used,
together with the high speed PCI bus.
The main features are:
•
PC/104-Plus Bus slot, fully compatible with PCI version 2.2 specifications.
•
Integrated PCI arbitration interface (32 bit wide, 3.3V).
•
Translation of PCI cycles to ISA bus.
•
Translation of ISA master initiated cycle to PCI.
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Support for burst read/write from PCI master.
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33 MHz PCI clock.
•
Power: +3.3V, +5V, +12V, -12V
Note:
The 3.3V pins on the PC/104 Plus bus are not supplied by the onboard
3.3V power supply in default. The maximum current is limited to 10.0 A.
With 0R0-Resistor-Jumpers the 3.3V pins can by supplied by the onboard
3.3V power supply, but with a lower current limit.
If a PC/104-Plus peripheral board needs 3.3V supply from the bus with
more than that limit, it must be supplied externally.
