The 10GBase-R PHY IP may not obtain block lock when the "Use external PMA control and Reconfig" option is enabled in Stratix® IV GT devices if the gxb_pdn , pll_pdn, and cal_blk_pdn signals are tied off to '0'.
For correct operation the signals must be driven as described in the Reset Control, and Power Down chapter of the Stratix IV GX/T handbook and not tied off to '0'.
The following details the naming translation between the 10GBase-R PHY IP and the Stratix IV GX/T handbook.
PHY IP signal name => Stratix IV GT handbook signal name
- gxb_pdn => gxb_powerdown
- pll_pdn => pll_powerdown
- cal_blk_pdn => cal_blk_powerdown