Xilinx Virtex-7 FPGA VC7222 Getting Started Manual page 14

GTH TX/RX Loopback Connections
See Figure 1-2
(RX0, RX1, RX2, and RX3) and the four transmitters (TX0, TX1, TX2, and TX3). Use eight SMA
female-to-female (F-F) adapters
shown in Figure 1-7
• TX0_P → SMA F-F Adapter → RX0_P
• TX0_N → SMA F-F Adapter → RX0_N
• TX1_P → SMA F-F Adapter → RX1_P
• TX1_N → SMA F-F Adapter → RX1_N
• TX2_P → SMA F-F Adapter → RX2_P
• TX2_N → SMA F-F Adapter → RX2_N
• TX3_P → SMA F-F Adapter → RX3_P
• TX3_N → SMA F-F Adapter → RX3_N
To ensure good connectivity, it is recommended that the adapters be secured with a wrench,
Note:
however do not over-tighten the SMAs.
X-Ref Target - Figure 1-6
X-Ref Target - Figure 1-7
VC7222 IBERT Getting Started Guide
UG971 (Vivado Design Suite v2015.1) April 27, 2015
to identify the P and N coax cables that are connected to the four receivers
(Figure
and detailed in the following list:
Figure 1-6: SMA F-F Adapter
Figure 1-7: TX-To-RX Loopback Connection Example
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Chapter 1: VC7222 IBERT Getting Started Guide
1-6) to connect the transmit and receive cables as
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