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, XAUI||3||*_50ps|
|=<1Gbps||1, 2, 3||*_160ps, *_90ps, *_50ps|
|1Gbps - 3Gbps||2, 3||*_90ps, *_50ps|
|>3Gbps - 6Gbps||3, 4||*_50ps, *_30ps|
|>6Gbps||4, 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.