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Virtex-6 FPGA GTH Transceivers - Wizard v1.9 incorrectly sets GTH Transceivers in PMA loopback by default
The Virtex-6 FPGA GTH Transceivers are placed in PMA loopback mode by default in Wizard v1.9 released with ISE Design Suite 13.3.
This answer record explains how to disable this loopback so that the GTH Transceivers can be placed in a normal operation mode.
Virtex-6 FPGA GTH Transceiver Wizard v1.9 sets the PMA_LPBK_CTRL_LANEx[1:0] to 2'b10 by default.
As documented in Table 2-15 of the Virtex-6 FPGA GTH Transceivers User Guide (UG371), this value sets the GTH Transceiver in TX pre-driver PMA loopback mode: http://www.xilinx.com/support/documentation/user_guides/ug371.pdf
To disable the loopback mode, this value should be changed to 2'b00.
This is fixed in v1.10 of the Virtex-6 FPGA GTH Transceiver Wizard released with ISE Design Suite 13.4.
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- Virtex-6 FPGA GTH Transceiver Wizard