Pc/104-Plus Bus Interface - Lippert PC/104-Plus Technical Manual

Technical Manual PC/104-Plus "Cool RoadRunner II" Version 1.16

1.7 PC/104-Plus bus interface

The PC/104-Plus bus is a modification of the standard PCI PC bus. It incorporates all of
the PC/104 features, with the added advantage of the high speed PCI bus.
The main features are:
PC/104 Plus Bus slot fully compatible with PCI version 2.1 specifications.
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Integrated PCI arbitration interface (32 bit wide, 3.3V).
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Translation of PCI cycles to ISA bus.
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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.
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The "Cool RoadRunner II" supports only signal levels at 3.3 Volt. Adapter boards on the
PC/104-Plus bus must tolerate this voltage. Signal levels of 5 Volt are not allowed.
Note: The internal DC/DC converter does not supply the 3.3 Volt
Because of the complete functionality in on board, there are some restrictions for exten-
sion boards on the PC/104 Plus bus:
SLOT0: no restrictions are known for this slot.
SLOT1: only extensions boards that will not use the busmaster function can operate
on this slot number. If an extension board with busmaster function is used on
this slot number the system might hang during boot-time. This restriction is
only valid if the board is shipped with the onboard Ethernet controller (stan-
dard configuration).
SLOT2: no restrictions are known for this slot.
SLOT3: this slot is used by the onboard VGA controller and cannot be used for ex-
tension boards. This restriction is only valid if the board is shipped with the
onboard VGA controller (standard configuration).
Note: The "Cool RoadRunner II" supports only one busmaster
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pins on the PC/104-Plus bus.
extension board. This can be used only in SLOT0 or
SLOT2.
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