Power And Ground Signals - Intel 41210 Design Manual

Table 23. Power and Ground Signals
Signal
RCOMP
VCC15
VCC33
VCCAPE
VCCAPCI[2:0]
VCCBGPE
VCCPE
VSS
VSSAPE
VSSBGPE
Intel® 41210 Serial to Parallel PCI Bridge Design Guide
Recommendations
100 ±1% (1/4 W) pulldown resistor to ground.
The trace impedance of this signal should be < 0.1
Connect to 1.5V power supply.
Note: Linear voltage regulators are recommended
when using 1.5 Volt power supplies.
Decoupling:
5 0.1uF caps beneath package (backside of board)
2 1.0 uF caps as close as design rules permit to
package
3 10 uF caps as close as design rules permit to
package
Connect to 3.3V power supply.
Decoupling: TBD
The platform must insure that the VCC33 voltage rail
be greater than to (or no less than 0.5V below) VCC15
(absolute voltage value at all times during 41210
Bridge operation, including during system power up,
power down or any other time during system operation.
This can be accomplished by placing a diode (with a
voltage drop < 0.5V) between VCC15 and VCC33.
Anode will be connected to VCC15 and cathode will be
connected to VCC33.
Connect to 1.5V power supply.
See Figure 23 for circuit.
Voltage output of the bandgap filter circuit into 41210
Bridge, separated from the rest of the VCC15s. See
Figure 25 for circuit.
Connect to 1.5V power supply.
Decoupling:
3 0.1uF caps beneath package (backside of board)
4 1.0 uF caps as close as design rules permit to
package
2 10 uF caps as close as design rules permit to
package
Connect to ground.
See Figure 24 for circuit.
Ground for the bandgap filter circuit, separated from
the rest of the VSSs. See Figure 25
Design Guide Checklist
Analog compensation pin for
PCI. 0.75V nominal.
1.5V ±5% core voltage.
3.3V ±5% PCI I/O voltage.
1.5V ±3% Analog PCI Express
voltage.
Analog PCI voltage pins.
2.5V ±3% PCI Express voltage.
1.5V ±3% PCI Express voltage.
Ground reference for all
supplies.
Analog ground for PCI Express.
Ground for analog bandgap
for circuit. voltage.
Reason/Impact
63