PCIE2-425/PCIE2-426 AND PCIE2-439/PCIE2-436
5-2
PCIe2-2712 PCI Express Gen2 Expansion System User’s Manual
Revision 1.0, February 2015
5.5.1
PCIe2-436/439 LEDs
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 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.
The top (or right) LED on the panel is a "PCIe Link Indicator". This yellow LED is
ON solid when all
cable lanes used and are operating at Gen2 rates. A cable link running at Gen1 rates and/or using less
lanes than available will indicate status with a blinking LED. The blinking pattern is the same as the slot
indicators, see Table 4-2
5.5.2
MECHANICAL
The PCIe2-436 and PCIe2-439 are low profile PCI Express form factor upstream cards and are
available with either a standard height front panel or a low profile front panel. For the PCIe2-436, see
Figure 5-4 for a mechanical drawing of the card and Figure 5-3 for a front panel drawing. For the
PCIe2-439, see Figure 5-8 for a mechanical drawing of the card and Figure 5-7 for a front panel
drawing.
5.5.3
PCIe2-436/439 Output Swing, De-Emphasis and Receive Equalization
The transceiver silicon used on the PCIe2-436/439 has eight steps of programmable de-emphasis, four
steps of output swing and eight steps of receive equalization. The as-shipped-default configuration of
the transceiver silicon is what Cyclone Microsystems has determined is the best setting for Gen2
operation with both 1m and 3m PCIe cables shipped with Cyclone PCIe Expansion systems. This
configuration will also function adequately for Gen1 operation.
