Test Case Examples; Sdd21 Loss Characteristic Of Example Test Case - Texas Instruments DS250DF810EVM User Manual

Test Case Examples

4 Test Case Examples
The following is an example test case with results collected using this EVM.
• Data Rate: 25.78125Gbps
• Data pattern: PRBS31
• Backplane insertion loss: -35dB @ 12.9GHz
• Crosstalk at victim RX: 4.1 mV RMS (24.1 mVppd)
• Victim TX amplitude: 1200mVppd
• Victim TX FIR: C(-1)=-4, C(0)=24, C(+1)=-3
• Adapt mode: 2
• Adapted RX CTLE: [3,0,0,0]
• Adapted DFE: [-0x14, +0x2, +0x1, -0x2, 0x0]
Figure 20. SDD21 Loss Characteristic of Example Test Case
Results:
• Error count = 0, BER < 1E-13
• Horizontal eye opening (HEO): 0.44UI @ 1.5E-5
• Vertical eye opening (VEO): 190mV @ 1.5E-5
• Eye plot:
-1.000 -0.750
+-------+-------+-------+-------+-------+-------+-------+-------+
+300.0 ************************************++++++++++++****************
+290.6 *******************************+++++++++++++++++++**************
+281.3 *****************************++++++++++++++++++++++*************
+271.9 ***************************+++++++++++++++++++++++++************
+262.5 +*************************+++++++++++++++++++++++++++*********+*
+253.1 ++*++********************+++++++++++++++++++++++++++++*****+++++
+243.8 ++++++*++****************+++++++++++++++++++++++++++++++++++++++
+234.4 +++++++++++**************+++++++++++++++++++++++++++++++++++++++
+225.0 ++++++++++++************+++++.++++++++++++++++++++++++++++++++++
+215.6 +++++++++++++***********++++...+++++++++++++++++++++++++++++++++
+206.3 ++++++++++++++**********+++......+++++++++++++++++++++++++++++++
+196.9 +++++++++++++++********++++.......++++++++++++++++++++++++++++++
+187.5 +++++++++++++++********++++........+++++++++++++++++++++++++++++
+178.1 +++++++++++++++********++++.........++++++++++++++++++++++++++++
+168.8 ++++++++++++++++******++++..........++++++++++++++++++++++++++++
+159.4 ++++++++++++++++******++++...........+++++++++++++++++++++++++++
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DS250DF810EVM User's Guide
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SNLU180C – August 2015 – Revised September 2019
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