Article ID: 000081690 Content Type: Troubleshooting Last Reviewed: 06/29/2014

What are the legal TX common mode voltage QSF assignments when using the 1.5-V PCML I/O Standard for Stratix V GX/GT and Arria V GZ devices?

Environment

  • Arria® V GZ FPGA
  • Stratix® V GS FPGA
  • Stratix® V GT FPGA
  • Stratix® V GX FPGA
  • Stratix® V FPGAs
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Description

When the Transceiver I/O Standard is set to 1.5-V PCML on Stratix® V GX/GT or Arria® V GZ devices, the valid TX Common Mode Voltage settings are:

For data rates < 6.5Gbps and VCCR_GXB/VCCT_GXB = 0.85V:

  • XCVR_TX_COMMON_MODE_VOLTAGE  = VOLT_0P50V

All other cases:

  • XCVR_TX_COMMON_MODE_VOLTAGE  = VOLT_0P65V

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