Keysight M8000 Series of BER Test Solutions User Guide 223
User Interface - M8020A Display Views 4
Block Settings
Sequence Block
A sequence block can contain an arbitrary user defined pattern, but the
effective length of such a sequence block is enlarged internally to fit all the
granularity requirements. This leads an effectively sent waveform to be
separated into two distinct parts. One part is dubbed as payload
(containing the desired pattern) while the other part is called extension
(required to meet hardware limitations).
It is ensured that the sequence block length always contains an integral
number of symbols. Additionally, the number of sequence block symbols is
divisible by two, which allows to stay in sync with a half rate clock signal
across multiple sequence blocks.
Traditionally, a sequence block contains only the desired pattern but for
M8195A modules, a non-looped sequence block contains a payload and
extension pattern part.
•Payload
It consists of the user-defined pattern. The data sent during the
payload duration is provided from a memory pattern location, PRBS
selection, etc.
The location of the payload inside a sequence block is selectable.
Following are the available choices for pattern alignment:
• Align payload to sequence block start
• Align payload to sequence block end
•Extension
The extension part is necessary because of limitations such as
sequencer linkage across multiple channels, AWG sample memory
granularities, module-wide sample rate and so forth. It extends the
waveform sent during playback of a non-looped sequence block to
match all preconditions.
Sequence Block
Payload Extension
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