CyClone 600-2708 PCI Express, Руководство пользователя

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600-2708 PCI Express Expansion System User’s Manual
4-1
Revision 1.0, June 2010
CHAPTER 4
SYSTEM OPERATION
4.1 SYSTEM POWER UP
The host PC with the PCIe-425 installed controls power-up for the entire system. The PCI Express cable
should be connected between the PCIe-425 and the PCIe-451 and the 600-2708 power cord should be
connected to the chassis and plugged into a power socket. There is a power button on the front of the
600-2708 Expansion Chassis, however, it is not connected and serves no practical purpose in this appli-
cation. When the host PC is powered on, a signal is sent over the PCI Express cable to turn on the 600-
2708. If the chassis does not power up, make sure that all cards are seated properly, the chassis is
plugged in, the PCI Express cable is connected properly and the switch on the power supply is in the on
("1") position.
4.2 SEATING OF CARDS
Unlike standard PC applications, the 2708 Expansion Systems has a narrow lower gate that precisely
engages the lower end of the PCI Express Add-In board’s face panel. The purpose is to ensure correct
electrical connector mating of up-plugged boards. Failure to accurately mate the lower end of the face
panel with the chassis lower gate will lead to the board not being recognized by the host.
4.3 PCIe-425 HOST BUS CABLE ADAPTER
The PCIe-425 Host Bus Cable Adapter is installed in a host computer’s x8 Gen2 slot providing a
bandwidth matched interface from the host to the x8 cable and, in turn, the expansion chassis. It can also
be plugged into Gen1 x8 slots, reducing performance.
4.3.1 PCIe-425 Power
The PCIe-425 only uses +3.3V power from the host, see Table 3-2.
4.3.2 PCIe-425 Mechanical
The PCIe-425 is a low profile PCI Express add-in card and is available with either a standard height
front panel or a low profile front panel. See Figure 5-3 for a mechanical drawing of the card and Figure
5-2 for a front panel drawing.
4.3.3 PCIe-425 LED Indicators
The bottom (or left) LED on the front panel is the "Cable Present Detect" LED. This green LED reflects
the status of the "CPRSNT#" signal in the PCIe Expansion Cable. When the LED is ON, it is indicating
that the "CPRSNT#" signal is asserted. The PCIe-451 chassis asserts "CPRSNT#" to indicate that it is
present, the cable is connected and power is good. If this LED is OFF, there may be a problem with
+3.3V power in the expansion chassis or the PCIe Expansion Cable is not connected properly.