Stratix II GX Characterization Results
Stratix® II GX devices are the industry’s first 90-nm FPGA with embedded transceivers able to support data rates up to 6.375 Gbps on all device channels simultaneously. The Stratix II GX device has undergone rigorous testing to prove performance between 600 Mbps and 6.375 Gbps. Results show the robust nature of the transceiver and demonstrate the excellent jitter performance of the device.
The following material provides a snapshot of the characterization. A PCI Express, SONET OC-12 and OC-48, Fibre Channel FC1, FC2, and FC4, and a detailed PMA and PCS characterization report is now available from Altera. Please contact your local sales representative for more information.
Test Results
Transmitter Eye Diagrams
Thousands of Stratix II GX eye diagrams are available at your fingertips with Altera’s Eye Viewer. Simply select the data rate, channel type, output voltage, pre-emphasis, data pattern, and temperature from a drop-down menu and the Eye Viewer automatically displays the corresponding eye diagram from among thousands. Eye diagrams at the far end of a 16" and 30" XAUI backplane through two connectors, with various pre-emphasis levels, illustrate the effectiveness of the Stratix II GX transceiver in compensating for channel degradation.
You may view eye diagrams with the following configuration settings and conditions:
| Table 1. Eye Diagram Configuration Settings and Conditions |
| Parameter |
Value |
| Data rate |
6.375 Gbps, 5 Gbps, 3.125 Gbps, and 2.5 Gbps |
| Channel Type (FR-4 PCB) |
Nearend (~ 3”), XAUI Backplane 16” and 30” |
| Voltage Output Differential (VOD) |
400, 800, 1000, and 1200 mV |
| Pre-Emphasis 1st Post Tap |
Settings 0 to 12 |
| Data pattern |
PRBS-7, PRBS-23, PRBS-31 |
| Temperature |
0, 25, and 70 deg C |
Note: Although Stratix II GX transceivers operate seamlessly across a wide range of data rates from 600 Mbps to 6.375 Gbps, only a select set of data rates are available with the Eye Viewer. Furthermore, not all configuration settings are valid and not all valid combinations are available at this time. Refer to the Stratix II GX Device Handbook for the complete list of available transceiver configuration settings.
Stratix II GX Eye Diagram Viewer
Figure 1 demonstrates high level of isolation between the Stratix II GX transceiver channels and the excellent jitter performance offered by the transceivers. The measurements were taken from a single channel of a Stratix II GX device at various data rates, while the other channels continuously operated at 6.375 Gbps.
Figure 1. Stratix II GX Transceiver Performance at Various Data Rates, With all Other Channels Operational at 6.375 Gbps
Jitter Tolerance—Input
The jitter-tolerance curve illustrates the capability of the receiver to tolerate jitter in the incoming data pattern.
Figure 2 shows the jitter tolerance of the transceiver at 6.375 Gbps, compared against the common electrical I/O (CEI) jitter mask. The results show that the transceiver's jitter tolerance is well above the CEI jitter mask specification.
Figure 2. Transceiver Jitter Tolerance at 6.375 Gbps
Figure 3 shows the jitter tolerance of the transceiver at 3.125 Gbps, compared against the XAUI jitter mask. The results show that the transceiver's jitter tolerance is well above the XAUI jitter specification.
Figure 3. Transceiver Jitter Tolerance at 3.125 Gbps
Figure 4 shows the jitter tolerance of the transceiver at 2.5 Gbps. The graph uses the 3.125 Gbps XAUI jitter mask purely as reference. Again, the results show that the transceiver's jitter tolerance is well above the XAUI jitter mask specification.
Figure 4. Transceiver Jitter Tolerance at 2.5 Gbps
Receiver Jitter Transfer
Receiver jitter transfer shows how the Stratix II GX receiver, or more specifically the receiver clock data recovery circuit (CDR), responds to system noise, particularly from the input data stream.
Figure 5 shows Stratix II GX receiver jitter transfer plot at 6.375, 3.125, and 2.5 Gbps. Measurements are made with 80 percent logic and 80 percent I/O switching.
Figure 5. Receiver Jitter Transfer Curves
Transmitter Jitter Transfer
Transmit jitter transfer shows how the Stratix II GX transmitter, or more specifically the transmitter phase-locked loop (PLL), responds to system noise, particularly from the reference clock.
Figure 6 shows the Stratix II GX transmitter jitter transfer plot at 6.375, 3.125, and 2.5 Gbps.
Figure 6. Transmit Jitter Transfer Curves
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