Xilinx 7 Series User Manual page 66

Chapter 2: Shared Features
Table 2-28: Loopback Attributes
LOOPBACK_CFG
PMA_LOOPBACK_CFG
66
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Attribute Type
1-bit Binary
1-bit Binary
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Description
Reserved.
Reserved.
7 Series FPGAs GTP Transceivers User Guide
UG482 (v1.9) December 19, 2016