Altera Cyclone II EP2C35 PCI Development Board Manuel d'utilisateur télécharger pdf (Page 18)

2–8 Core Version 4.0.0 Altera Corporation

Cyclone II EP2C35 PCI Development Board Reference Manual May 2005

Component Operation

External Power Jack

Board header J2 is a power receptacle from a standard laptop power

supply. Table 2–8 shows that the external power switch (SW1) enables the

external power supply.

1 If both the external power and the PCI power are supplied at the

same time, the board draws power from the external power

supply for all power rails except the 5.0-V power rail. Therefore,

when the PCI 3.3-V circuit transistors detect external power

supply voltage, they disable the power from the PCI connector.

The external power switch does not control the power from the

PCI connector.

Test Points

Table 2–9 shows the board’s power supply test points.

Table 2–8. External Power Supply Enable

External Power Switch (SW1)

Position (PWR SWITCH)

Description

Off Disable external power supply

On Enable external power supply

Table 2–9. Board’s Power Supply Test Points

Signal

Name

Reference

Designator

Description

VREF TP4 0.9-V VREF for DDR2 SDRAM

Ground TP5 Ground test point near oscillator socket.

TP1 Ground test point near power connector.

TP2 Ground test point near PWR SWITCH.

TP3 Ground test point near MICTOR.

TP6 Ground test point near DDR2 SDRAM.

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Altera Cyclone II EP2C35 PCI Development Board Manuel d'utilisateur Page 18