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AR# 42308

Virtex-6 GTH Transceivers - Transmitter hangs after manually triggering GTHRESET

Description

I generate an example design with the Virtex-6 FPGA GTH Transceiver Wizard.

I use RX OFF and divided rate.

After manually triggering GTHRESET, GTH transmitter hangs.

Solution

There is a bugin the save_state_div_sm state machine of*_gth_init.v module. After GTHRESET, it forgets to release TXPOWERDOWN.

To work around this issue, modify the state machine as follows:

From

default : state_div_sm <= 'DLY DONE;

To

default : begin state_div_sm <= 'DLY DONE; TXPOWERDOWN_OUT <= 'DLY 1'b0; end

This issue isfixed in the ISE design tools 13.4 release.

AR# 42308
Date Created 07/20/2012
Last Updated 12/15/2012
Status Active
Type General Article