Table of Contents
Advertisement
VITA-49 Encoding
Time Stamp Generation
Keysight M8131A 16/32 GSa/s Digitizer User's Guide
Each packet is always encapsulated in the VITA-49 data format, including
a 28 bytes header and 4 bytes trailer.
VITA-49 encoding of the M8131A is implemented according to ODI-2.1
(High Speed Data Formats) Revision 3.0, January 3, 2019
The VITA-49 header includes time stamp information. The M8132A
supports 'UTC time plus picoseconds' according to ODI-2.1 Figure 3-11
(TSI=01; TSF=10) as the time stamp format.
The time stamp marks the beginning of the first sample of the
corresponding packet. The time stamp does not mark the trigger position
in the packet.
A time stamp is added to the header of each packet.
•
The time stamp for each packet is encoded as VITA-49 header and
streamed over ODI.
•
For monitoring purposes, one waveform segment including the time
stamp of its first packet can be stored in the waveform memory.
During the initialization of the M8131A, the controlling PC loads the local
time of this PC to the M8131A in the UTC data format. After this
initialization, the M8131A uses its internal timing reference to measure
time and increment the internal clock, or it uses the timing reference
applied to the Reference Clock Input pin.
The time stamp counter of the M8131A (UTC time) can be controlled by:
•
SCPI API
•
SFP
In a synchronous system consisting of two or more M8131A, the time
stamp counters of each M8131A must be initialized individually.
There are three sub-modes available for segmented streaming:
•
Continuous Packetized VITA-49.
•
Streaming is started once and runs continuously until aborted by the
user. This continuous data stream is divided into individual VITA-49
packets, each having an individual time stamp.
•
The packet length can be adjusted.
Streaming
4
91
Advertisement
Table of Contents
