Under what conditions might the Deterministic Latency PHY fail to achieve rx_syncstatus when implementing the OBSAI protocol in Arria® V GX/GT devices?

Description

When implementing the OBSAI protocol using the Deterministic Latency PHY in Arria® V GX/GT devices, you may fail to achieve rx_syncstatus when IDLE, IDLE_ACK, and IDLE_REQ patterns are sent during the link-up process.  

Resolution

You can achieve synchronization by retriggering rx_patternalign or asserting rx_digitalreset.

This applies to the Deterministic Latency PHY with the following configuration.

• Data Rate: 6.144 Gbps
• PMA-PCS Data Width: 20-bits

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