Issue
The Virtex-6 FPGA GTH transceivers can be configured in a x4 mode by setting GTHX4LANE to '1', where lanes 0, 1, 2 and 3 form a single x4 link.In this mode, a change in the control settings on the master lane (lane 0) also causes the same effect on the slaves. However, this does not apply to the RXBUFRESETport, so this reset port should be connected individually for all of the four lanes.But, in the module 'v6_gthwizard_v1_8_quad.vhd' or 'v6_gthwizard_v1_8_quad.v',RXBUFRESET for lanes 1/2/3 areincorrectly tied to '0'.
Work-around
The RXBUFRESET port connections in an x4 mode are currently set as follows when GTHX4LANE=1:
RXBUFRESET0 => rxbufreset0_i,
RXBUFRESET1 => tied_to_ground_i,
RXBUFRESET2 => tied_to_ground_i,
RXBUFRESET3 => tied_to_ground_i,
This should be changed to:
RXBUFRESET0 => rxbufreset0_i,
RXBUFRESET1 =>rxbufreset0_i,
RXBUFRESET2 =>rxbufreset0_i,
RXBUFRESET3 =>rxbufreset0_i,
This isfixed in the HDL wrappers generated by the Virtex-6 FPGA GTH Transceiver Wizard v1.9 inISE design tools version 13.3.
| Answer Number | Answer Title | Version Found | Version Resolved |
|---|---|---|---|
| 34565 | Design Advisory Master Answer Record for Virtex-6 FPGA | N/A | N/A |
| Answer Number | Answer Title | Version Found | Version Resolved |
|---|---|---|---|
| 34565 | Design Advisory Master Answer Record for Virtex-6 FPGA | N/A | N/A |
| 38596 | Virtex-6 FPGA GTH Transceiver - Known Issues and Answer Records List | N/A | N/A |