Description
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 | 4 | *_30ps |
| PCI Express Gen1, XAUI | 3 | *_50ps |
| Gigabit Ethernet | 1 | *_160ps |
| =<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.