Application and troubleshooting of ADLINK PCIe-8560/PXI-8565 expansion kit

Equalizer level (Pin 1&Pin 2 combination)

Default (strongest balance): Both switches 1 and 2 are set to ON, suitable for 7-meter long lines, compensating for high-frequency losses.

Moderate balance: Only one of switches 1 or 2 is turned on (specific combinations need to refer to Table 3-2 in the manual, which lists three levels but does not clearly distinguish between each gear. In reality, the factory default is the strongest).

Weak or no equilibrium: Suitable for extremely short lines (1 meter) or situations with excellent signal quality, excessive equilibrium can amplify noise.

Output swing control (Pin 3)

Default high swing can improve signal-to-noise ratio, but may increase radiation; If the laboratory environment is sensitive to EMI, it can be changed to normal swing (switch 3 OFF).

Intensify control (Pin 4)

Default high attenuation can help compensate for high-frequency attenuation of cables; For short distances, it can be reduced to increase weight.

Optimization suggestion: If the system experiences link instability (such as random device loss or blue screen), try starting from the default strongest balance and gradually reducing it. Usually, 7 meters can be used as the strongest, 3 meters can be used as moderate, and 1 meter can be used as weak or closed. After adjustment, it is necessary to power on again for the settings to take effect.

PXI-8565 Jumper - Spread Spectrum Clock Control

The J1 jumper on PXI-8565 is used to enable or disable PCI clock spread spectrum, which is enabled by default (with three jumper caps located at positions 2-3). Spread spectrum modulation of PCI clock (33MHz) at low frequencies can significantly reduce system electromagnetic interference (EMI) and facilitate FCC/CE certification. However, in some high-precision measurement applications, spread spectrum may introduce clock jitter, which affects the accuracy of synchronous acquisition. If periodic errors are found in data collection, spread spectrum can be disabled (jumper cap moved to position 1-2), while ensuring sufficient electromagnetic shielding of the chassis.

Meaning of LED status indicator light

Both PCIe-8560 and PXI-8565 panels have D1 LED (serial link status).

The constant LED indicates that the link has been established (must meet the following conditions: cable connection is intact, PXI chassis is powered on, and host POST is in progress).

If the LED does not light up, check whether the cable is locked and whether the power supply at both ends is normal. If the LED turns off after the host is started, it may indicate that the link training has failed and the balance setting needs to be adjusted.

Common compatibility issues and systematic troubleshooting

As the kit serves as a transparent PCIe to PCI bridge, its compatibility depends on the host BIOS's ability to handle multiple PCI bus segments. The FAQ section focuses on answering the most common questions that engineers encounter:

Q1: What is the maximum extension distance?

A: 7 meters. ADLINK offers three types of cables: 1-meter, 3-meter, and 7-meter.

Q2: Do you need additional drivers?

A: No need at all, the operating system supports it natively.

Q3: How many expansion cases can a host connect to?

A: PCIe is a point-to-point topology, where one PCIe slot can only accommodate one expansion chassis. But if the host has multiple PCIe slots, multiple PCIe-8560 can be installed, each controlling a PXI chassis. In theory, the PCI bus can support 255 bus segments, but is limited by BIOS and operating system.

Q4: Why does the BIOS not recognize some modules inside the PXI chassis?

A: This is the most common question. The fundamental reason is that the BIOS resource allocation algorithm cannot handle complex bridging levels, especially when the host itself has multiple PCI devices. The solutions are as follows (in priority):

Update the host BIOS to the latest version (especially Intel 945, 965 or motherboard with updated chipset).

Disable unnecessary onboard devices (such as serial ports, parallel ports, onboard audio, secondary network cards, etc.) in BIOS settings to free up I/O and memory resources.

Remove all unnecessary PCI/PCIe cards inside the host, leaving only the graphics card and PCIe-8560 to reduce resource competition.

Attempt to insert PCIe-8560 into different PCIe slots, some slots may be directly connected to the CPU, while others are bridged through a chipset with different resource allocation strategies.

Step by step insertion test: First, insert only one module into the PXI chassis, confirm identification, and then add them one by one to determine which module is causing resource overflow.

If the above methods are ineffective, it may be necessary to contact the motherboard manufacturer for support or replace it with a server grade motherboard (usually supporting more bus segments).

Q5: Blue screen or module data error during system operation?

A: Check if the cable connections are loose, if the equalizer settings are appropriate, and if the PXI chassis power supply is sufficient (pay attention to the backplane power supply for high-power modules). In addition, confirm whether the spread spectrum clock setting of PXI-8565 conflicts with the measurement requirements.