Chapter 2
NI 5450 Overview
©
National Instruments Corporation
2-49
NI PXIe-5450 User Manual
5.
The memory size required to generate a waveform using Arbitrary
Sequence mode and Burst trigger mode with 2345 segments in a
sequence list is determined by the following formula:
Size in Bytes = 160 + (128 × 2,345) = 300,320 bytes.
Size in memory = 300,320 coerced up to the next multiple of 128 =
300,416 bytes.
Total Memory Size
The following examples show how to calculate total memory for an
application. The examples use each of the four trigger modes for the
Arbitrary Sequence mode and use varying numbers of waveforms,
waveform sizes, and number of segments in the sequences.
Note
The following examples only consider the memory used for instructions for one
sequence. It is possible to create and save to memory the instructions for as many
sequences as the available free memory allows.
Examples
1.
An application requires using three waveforms with the following
sizes: 72; 132; and 260 samples. The waveforms are generated by
using Arbitrary Sequence mode and Single trigger mode to configure
20,000 segments in a sequence list. The following tables show all the
numbers used to determine the total memory stored in the onboard
memory: 1,281,408 bytes.
Waveforms
Samples
Bytes
Rounded Size
A
72
144
256
B
132
264
384
C
260
520
640
Memory Size =
1,280
