Tektronix PCI Express

PCI Express Gen5 (32 GT/s)

• Receiver automation software for Tektronix DPO70000SX Series Real Time Scopes & Anritsu MP1900A BERT
• Wizard based user interface for each step of calibration and test
• Pop-up user tips to simplify decision making
• Stressed Eye Calibration (32 GT/s) &
  • Base & CEM
  • TP3 – AC/DC Balance, Amplitude, Tx Equalization, Sinusoidal Jitter tones, & Random Jitter
  • TP2 – DMI, CMI, Preset & CTLE Selection, Stressed Eye, Automated loopback through Configuration & Recovery
• Insertions Loss computation powered by Seasim Statistical Simulation Tool
• Rx Link Equalization (32 GT/s)
• Tx Link Equalization (32 GT/s)
• Jitter Tolerance (32 GT/s)
• Latest industry tool support (SigTest & Seasim)
• Calibration and test reports

PCI Express Gen4 (16 GT/s)

• Receiver automation software for Tektronix DPO70000SX Series Real Time Scopes & Anritsu MP1900A BERT
• Wizard based user interface for each step of calibration and test
• Pop-up user tips to simplify decision making
• Stressed Eye Calibration (32 GT/s)
  • CEM and Base
  • TP1 – AC/DC Balance, Amplitude, Tx Equalization, Sinusoidal Jitter tones, & Random Jitter
• TP2 – DMI, CMI, Preset & CTLE Selection, Stressed Eye, Automated loopback through Configuration & Recovery
• Insertions Loss computation powered by Seasim Statistical Simulation Tool
• Rx Link Equalization (16 GT/s)
• Tx Link Equalization (16 GT/s)
• Jitter Tolerance (16 GT/s)
• Latest industry tool support (SigTest & Seasim)
• Calibration and test reports

PCI Express PLL Bandwidth and Peaking

• PCI Express PLL Bandwidth and Peaking automation software for Tektronix DPO70000SX Series Real-Time Oscilloscopes and Anritsu MP1900A BERT
• Support for Gen 3/4/5 Tx PLL testing
• Support for Anritsu SI PPG (NRZ) and PAM4 PPG
• Shared software framework with Rx LEQ and Tx LEQ
• Supports testing with compliance (P0 to P10) and jitter measurement (toggle) patterns
• Software CTLE improves accuracy for high loss channel cases

PCI Express Gen5 (32 GT/s)

The TP3 (cable from BERT PPG to scope) is mandatory for all devices to ensure tolerances are met at the defined reference plane. Tek Tektronix PCI Express Receiver Test Suite wizard will guide the user through all the necessary steps to pre-channel signal is true to the specification requirements to ensure future calibration steps complete with ease.

1. AC-DC Balance – Small amounts of Tx EQ de-emphasis are enabled to balance low and high-frequency sections of the pattern at a common reference plane.
2. Amplitude – The differential voltage swing is required to be within 720 – 800 mV.
3. Tx Equalization Presets – Calibration of pre-shoot and de-emphasis is required to ensure true preset levels are used for testing receivers.
4. IL Measurement – Channel insertion loss is calculated using Seasim between TP3 and TP1 (loss before the TP3 reference is computed here for later removal).
5. RJ – Random Jitter (RJ) is calibrated to be 0.5 ps (RMS value) nominally.
6. SJ – Sinusoidal Jitter (SJ) is calibrated over the required range of 1-5 ps (p-p) including the nominal SJ specification of 0.1 UI (or 3.125 ps) at 100 MHz frequency.
7. [email protected] MHz – This calibration is required for JTOL measurements with some calibrations

   

8. Multi-tone SJ – For JTOL measurements where up to maximum 14 frequencies are used, calibration for frequencies other than 100 MHz is required to be performed.

Automatic characterization and precise calibration of presets, RJ, and SJ along with the important parameters used for calibration like pattern type, scope, BERT settings, regression line slopes, and intercept for reference.

PCI Express Gen4 (16 GT/s)

The TP1 (cable from BERT PPG to scope) is mandatory for all devices to ensure tolerances are met at the defined reference plane. Tek Tektronix PCI Express Receiver Test Suite wizard will guide the user through all the necessary steps to pre-channel signal is true to the specification requirements to ensure future calibration steps complete with ease.

1. AC-DC Balance – Small amounts of Tx EQ de-emphasis are enabled to balance low and high-frequency sections of the pattern at a common reference plane.
2. Amplitude – The differential voltage swing is required to be within 720 – 800 mV.
3. Tx Equalization Presets – Calibration of pre-shoot and de-emphasis is required to ensure true preset levels are used for testing receivers.
4. IL Measurement – Channel insertion loss is calculated using Seasim between TP3 and TP1 (loss before the TP3 reference is computed here for later removal).

   

5. RJ – Random Jitter (RJ) is calibrated to be 1 ps (RMS value) nominally.
6. SJ – Sinusoidal Jitter (SJ) is calibrated over the required range of 5-10 ps (p-p) including the nominal SJ specification of 0.1 UI (or 6.25 ps) at 100 MHz frequency.
7. [email protected] MHz – This calibration is required for JTOL measurements with some calibrations.

   

8. Multi-tone SJ – For JTOL measurements where up to maximum of 14 frequencies are used, calibration for frequencies other than 100 MHz is required to be performed.

Automatic characterization and precise calibration of presets, RJ, and SJ along with the important parameters used for calibration like pattern type, scope, BERT settings, regression line slopes, and intercept for reference.

PCI Express Gen5 (32 GT/s) & Gen4 (16GT/s)

The TP2 (end of the channel) calibration is a complex process requiring a deep understanding of the BERT, Real Time Oscilloscope, post-processing tools, and the PCIe specifications. The Tektronix PCI Express Receiver Test Suite will remove the complexity and ensure the desired results are achieved through user-friendly automation. Time to TP2 completion is critical, so efficient techniques have been Implemented to ensure an accurate stressed eye is achieved within a reasonable time scale. From calibration of DMI (differential mode interference modeling cross-talk) to the fine granularity adjustments to SJ and DMI necessary to find the stressed eye solutions space, our automation software will guide you through this otherwise daunting task.

1. DMI– The differential mode interference is required to be calibrated within 5-30 mV (p-p) [Gen5] / 10-25 mV (p-p) [Gen4] by capturing the 2.1 GHz sinusoidal output for a duration of 40 ns.
2. CMI – The common-mode interference is required to be calibrated for a nominal voltage of 150 mV (p-p) by capturing the 120 MHz sinusoidal output for a duration of 62.5 us.
3. Channel insertion loss for DMI/CMI & eye diagram measurements computed with Seasim (TP1 to TP2/TP2P for 16GT/s & TP3 to TP2/TP2P for 32GT/s).
4. Channel Selection based on optimal Tx EQ Preset and Rx CTLE – Base Specification compliant for Eye Area criteria and tie breaker rules.
5. Stressed-Eye calibration – Fine-tuning of the eye using amplitude, SJ, & DMI is utilized to place the stressed eye within allowed tolerances.

   

   

   Automated TP2 calibration plots and stressed eye calibration details along with other important parameters like pattern type, scope and BERT settings, and regression line slopes and intercept for reference.

6. Eye height 15 +/- 1.5 mV [Gen5 & Gen4] and
   • Eye width 9.375 +/- 0.5ps [Gen5]
   • Eye width 18.75 +/- 0.55ps [Gen4]

SJ Amplitude Calibration for Gen 5/4/3

• Calibration of SJ amplitude of various tones added to 100 MHz Refclk for DUT’s Tx PLL
• Adjustable SJ amplitude
• User-controlled SJ frequency selection to ensure adequate resolution at peaking & 3dB point
• Increased averaging can be used to minimize variation (5 recommended)
• Software CTLE ensures support for higher loss channels and various DUT Tx patterns

PLL Bandwidth measurements

• Bandwidth and peaking reported for selected data rates
• DUT Tx can transmit compliance patterns or jitter measurement (toggle) patterns
• Consistent DSP algorithm used for SJ calibration and DUT testing
• Test report with PLL bandwidth, peaking, frequency response plot, and individual measurements