1 Reply Latest reply on Mar 7, 2013 10:37 AM by blackline1

    82576 SGMII Termination

    blackline1

      According to the 82576 datasheet (section 11.4.4),  SERDES/SGMII AC/DC specs are as per PICMG 3.1 Draft specification Rev 1.0 1000Base-BX. While the document specifies differential level requirements, it doesn't convey some info that would be specific to the 82576 SGMII implementation:

       

      1. Common-mode voltage level (are the I/O designed to LVDS, CML, etc)...or does Intel just recommend AC coupling to another SGMII device?

       

      2. Input termination (differential 100-ohm, common-mode biasing)...are there any requirements here, or is this all taken care of on-chip?

       

      For now, we're following the 82576 SERDES reference design - AC coupling (as per Sheet 7), but no other termination requirement.

       

      Dave