Article ID: 000083848 Content Type: Troubleshooting Last Reviewed: 06/11/2014

What transceiver slew rate settings are allowed in the Quartus II software for Stratix V GX and Arria V GZ devices?


  • Stratix® V GX FPGA
  • Stratix® V GS FPGA
  • Arria® V GZ FPGA

The following transceiver slew rate settings are allowed in the Quartus® II software for Stratix® V GX and Arria® V GZ devices.

Protocol/Datarate Allowed Quartus II Setting IBIS-AMI Setting

PCI Express Gen3, Gen2, CEI

PCI Express Gen1, XAUI3*_50ps
Gigabit Ethernet1*_160ps
=<1Gbps1, 2, 3*_160ps, *_90ps, *_50ps
1Gbps - 3Gbps2, 3*_90ps, *_50ps
>3Gbps - 6Gbps3, 4*_50ps, *_30ps
>6Gbps4, 5*_30ps, *_15ps

Assigning an invalid slew rate will result in an error message similar to the one below.

Error (15001): Assignment XCVR_TX_SLEW_RATE_CTRL of value "4" conflicts with the valid values of the parameter "pm_tx_slew_rate_ctrl"

  • Protocol declarations take priority over datarate. For example, XAUI has a per-lane datarate of 3.125 Gbps, but only a setting of "3" is allowed. A setting of "4" is not allowed for XAUI.
  • For protocols not listed in the table, you should use the slew settings associated with your datarate.
  • The IBIS-AMI slew rate figure is defined as the approximate transmitter 20% - 80% rise time. The "ps" figure should not be considered quantitative and is an approximate label only.
  • The IBIS-AMI models will allow you to simulate any slew rate setting for any datarate or protocol.



All postings and use of the content on this site are subject to Terms of Use.