4. Technical Information
4.a. LEDs
LED #
Function
CR2
Tx pair, Lane 0 (from card edge)
CR3
Rx pair, Lane 0 (from cable)
CR4
Tx pair, Lane 1 (from card edge)
CR5
Rx pair, Lane 1 (from cable)
CR6
Tx pair, Lane 2 (from card edge)
CR7
Rx pair, Lane 3 (from cable)
CR8
Tx pair, Lane 3 (from card edge)
CR9
Rx pair, Lane 2 (from cable)
Power LED
PCIe Lane Status LEDs
Power and
Cable present
LEDs
CR2 CR4 CR6 CR8
CR3 CR5 CR7 CR9
Cable present
LED
4.b. Block Diagram
LVPECL
Clock Buffer
Downstream
x4 PCI Express
Cable Connector
Upstream
x4 PCI Express
Card Edge Connector
PCIe Signal
Redriver
PCIe Signal
Redriver
x4 PCIe Tx
x4 PCIe Tx
Clock*
Clock*
LEDs
Cable Present/ Pwr
x4 PCIe Rx
x4 PCIe Rx
CPRSNT#
+3.3v
LEDs
PCIe lane
status
*Clock direction shown in Host configuration
One Stop Systems, Inc. OSS-KIT-EXP-4500
Rev. A
Page 7
