Keysight M8070A Programming Guide 53
Recommended Programming Techniques 2
After specifying a filler primative, various aspects of the (de)scrambler can
be configured with the <scrambler> node. With the polynomial attribute
the USB/PCIe or SATA polynomial can be selected. The reset value for the
scrambler and the reset value for the scrambler after a hold sequence can
be configured with the resetValue and resetValueAfterHold attribute. In
addition, it can be specified if the scrambler is reset after a filler primitive
was removed with the resetAfterFillerRemove attribute. All these nodes
are optional, with defaults suitable for USB testing. If just <scrambler>
node is given without attributes, it is equivalent to the following:
<scrambler polynomial="USB/PCIe" resetValue="65515"
resetValueAfterHold="6143" resetAfterFillerRemove="false">
Within the scrambler node, sequences of up to 4 symbols can be
configured that control the scrambler when they are seen in the incoming
data stream. With resetPrimitive the scrambler is reset, with holdPrimitive
it is paused and with pauseStartPrimitive it is paused until a
pauseEndPrimitive is seen.
The following are examples for the different standards.
USB 3.0
<codingConfigurations>
<b8b10>
<fillerPrimitive symbol1="K28.1" symbol2="K28.1"/>
<scrambler>
<resetPrimitive symbol1="K28.5"/>
</scrambler>
</b8b10>
</codingConfigurations>
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