Keysight 81150A - Pattern Types and Sequencing Capabilities

Appendix
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7.4.2 Pattern Types and Sequencing Capabilities
Introduction
Internally 2 types of patterns can be generated:
 81150A: Memory based patterns with a length of up to 16 Mbit for 2-
level patterns and up to 8 MSymbols for 3- and 4-level patterns.
 81160A 1 channel: Memory based patterns with a length of up to 4
Mbit for 2-level patterns and up to 2 MSymbols for 3- and 4-level
patterns.
 81160A 2 channels: Memory based patterns with a length of up to 2
Mbit for 2-level patterns and up to 8 MSymbols for 3- and 4-level
patterns.
 Algorithmically generated PRBS patterns with a polynomial of 7, 9,
11, 15, 23 and 31.
The 81150A / 81160A allows 2 different modes of pattern playback. First
there is the sequential playback of all bits in the pattern being used. In case
of continuous trigger mode, this will continuously output the pattern at the
output. In addition to this, it is possible to split the pattern into 2 parts, with
the repetition being only executed on the second part of the pattern. This
allows to setup preamble and payload definitions, where the preamble is
initializing the device under test, while the test itself is being done with the
looped payload part of the pattern.
 The preamble/payload model is not available when using the predefined
PRBS patterns.
The pattern definition contains the definition of a loop offset. This loop
offset is controlling at which bit inside the data pattern the pattern
generation will continue when the end of the pattern has been reached. By
setting this value to 0, all bits if the pattern will be looped, while for non-
zero loop offsets, only the bits beginning at the loop offset will be generated
at the second and all following repetitions.