Keysight Technologies M8000 Series

Keysight M8000 Series of BER Test Solutions User Guide 371
Setting up Patterns 7
PCIe/USB/SATA Scrambler Polynomials
For the symbol width 8b/10b, the following scrambler polynomials are
used:
• PCIe/USB - G(x) = x
16
+ x
5
+ x
4
+x
3
+1
• SATA - G(x) = x
16
+ x
15
+ x
13
+x
4
+1
For the symbol width 128b/130b and 128b/132b, both standards use the
same scrambler polynomial as following:
• PCIe/USB - G(x) = x
23
+ x
21
+ x
16
+x
8
+x
5
+x
2
+1
Link Training Configuration
This section allows you to configure link training for USB 3.0, USB 3.1,
PCIe 3.0 and PCIe 4.0.
Link Training for USB 3.0 and USB 3.1
The M8070A system software allows you to test the physical layer
compliance of a USB 3.0 and USB 3.1 DUT. It provides the parameters
which can be configured for link training USB 3.0 and USB 3.1.
If the symbol width is 10, you can configure the link training parameters for
USB 3.0 to control LTSSM ((Link Training and Status State Machine).
However, if the symbol width is 132, you can configure the link training
parameters for USB 3.1 to control LTSSM.
The following figure shows the parameters which can be configured for
link training USB 3.0: