Why doesn't Rx_data_ready bit update when synchronization is lost?

Description

In the 10GBASE-R PHY IP core version 10.1 and earlier, the RX_DATA_READY which is bit 7 of the PCS status register (0x82) does not deassert when synchronization is lost.

Affected Configurations

This issue affects both Stratix® IV and Stratix V implementations of the 10GBASE-R PHY.

Solution Status

This issue is fixed in the 10GBASE-R PHY IP core version 11.0.

Resolution

The workaround is to monitor the internal signals that indicate lock status and perform a digital reset of the channel when synchronization is lost.