Evaluation Board Manual
Preliminary
PPC750FX Evaluation Board
750FXebm_ch2.fm
June 10, 2003
Board Design
Page 25 of 115
2.12 Logic Analyzer Connections
The system controller device bus is attached to Mictor logic analyzer connectors.
HP Logic analyzer connection to the PCI bus is accomplished using a FuturePlus PCI Local Bus Passive
Analysis Probe, vendor part number FS2005. The customer may purchase this probe from the manufacturer.
Probe hardware does not ship with the board.
2.13 Power Supply
The PPC750FX evaluation board obtains its power from the PCI slot connector into which it is plugged or
from the on-board ATX power connector.
2.13.1 PCI Voltages
The voltages provided through the PCI slot connector are:
• +5 V
• +3.3V
All of the voltages described in the following sections are developed from the +3.3V PCI voltage.
2.13.2 System Controller Voltages
The system controller requires four voltages:
• System controller I/O—+3.3V
• DRAM —+2.5V
• CPU I/O—+2.5V
• System controller logic and Et1.8V
Note: There are no external connection points for the +1.8V or +2.5V supplies. As a result variable
voltage testing and current measurement capability for these supplies are not available.
2.13.3 PPC750FX Voltages
The PPC750FX chip requires two voltages:
• Logic and PLL analog circuits— +1.45V
• 60x bus I/O circuits— +2.5V
Both voltages are generated by on-board regulators from the +3.3V voltage. Current measurement points are
available for both voltages. These measurement points can also be used to connect external voltage
supplies.
Note: The 60x bus voltage supply to the PPC750FX can be +1.8V, +2.5V, or +3.3V. To use any voltage
other than the +2.5V supplied by the board, the voltage must be supplied externally, and the 60x voltage
selection signals to the PPC750FX must be programmed accordingly.
Содержание PPC750FX
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