Acqiris SA230E User Manual page 39

The "data stream" concept
Figure 3.4 - Illustration of the data stream concept.
Usage
Acquisition
User should define:
the record size: the number of samples per record should be a multiple of 32,
the number of elements to fetch: should be a multiple of 16,
then, simply starts the acquisition.
The maximum amount of data that can be streamed in a single CST acquisition is:
48
2 – 64 bytes
Output format
Output data streaming is managed by the application. In output, raw data and markers are provided
without any processing.
Each streams can be read independently or ignored.
Acqiris SA230E User's Manual
3.2 Simultaneous acquisition and readout (CST option)
A data stream is defined as a sequence of data elements
made available over time. In current implementation, there
are 4 streams:
2 data streams containing the acquired samples for each
channel
2 markers streams containing the time-stamps for each
channel
Each stream can be read independently and in a time
multiplexed manner allowing a fine tuning of the system
and application performance.
All the streams have a single "pipe" to be channeled to
which corresponds to the PCIe interface. The size of the
"pipe" represents the volume of data flow that can be
extracted from the module. When the stream data rate is
larger of the available PCIe data bandwidth an overflow
occurs and the acquisition stops.
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