Technical Manual "Thunderbird/MM” Version 1.2
12.08.2005
Page 11 of 48
1.7 Board Types
1.7.1 Board Type I
The on-board power supply generates all necessary voltages from a standard ATX power supply.
There is a socket for the CPU on board. Therefore, the CPU is changeable.
1.7.2 Board Type II
Optionally, the Thunderbird/MM is available for use with a single supply voltage of +5 V. The on-
board power supply generates all necessary voltages (apart from +12 V) from this. The +12 V can
also be supplied.
This “Board Type II” will be also usable for passive cooling.
The CPU is soldered on the board.
1.8 PCI Bus Interface
The main features are:
•
PCI rev. 2.2 compliant implementation
•
Integrated PCI arbitration interface (32 bit wide, 3.3 V)
•
Translation of PCI cycles to ISA bus
•
Translation of ISA master initiated cycle to PCI.
•
Support for burst read/write from PCI master.
•
33 MHz PCI clock
The Thunderbird/MM supports on PCI only signal levels at 3.3 Volt. Adapter boards on the PCI-slot
must tolerate this voltage. Signal levels of 5 Volt are not allowed.
The internal DC/DC converter does supply the 3.3 Volt pins on the PCI bus.
The maximum supply current is 2.0 A at 3.3 Volts.
Riser-Cards for 3.3 V and 5 V PCI-Slots are available!
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