Chapter 2
NI 5450 Overview
NI PXIe-5450 User Manual
2-48
ni.com
Instruction Memory Size
Examples
1.
The memory size required to generate a waveform in Arbitrary
Waveform mode is always 256 bytes of onboard memory for that
specific waveform. Each waveform that is saved to onboard memory
uses 256 byes of memory for instructions.
2.
The memory size required to generate a waveform using Arbitrary
Sequence mode and Stepped trigger mode with 50 segments in a
sequence list is determined by the following formula:
Size in Bytes = 208 + (80 × 50) = 4,208 bytes.
Size in memory = 4,208 coerced up to the next multiple of 128 =
4,224 bytes.
3.
The memory size required to generate a waveform using Arbitrary
Sequence mode and Continuous trigger mode with 500 segments in a
sequence list is determined by the following formula:
Size in Bytes = 208 + (64 × 500) = 32,208 bytes.
Size in memory = 32,208 coerced up to the next multiple of 128 =
32,256 bytes.
4.
The memory size required to generate a waveform using Arbitrary
Sequence mode and Single trigger mode with 1,003 segments in a
sequence list is determined by the following formula:
Size in Bytes = 80 + (64 × 1,003) = 64,272 bytes.
Size in memory = 64,272 coerced up to the next multiple of 128 =
64,284 bytes.
Instruction Memory Size
*
Formulae
Arbitrary Waveform
Mode
Size in bytes = 256 per waveform
Arbitrary Sequence
Mode
†
Stepped: Size in bytes = 208 + (80 ×
N
)
Continuous: Size in bytes = 208 + (64 ×
N
)
Single: Size in bytes = 80 + (64 ×
N
)
Burst: Size in bytes = 160 + (128 ×
N
)
* The instruction size in memory is the size, in bytes, rounded up to the nearest multiple
of 128 bytes.
†
N
= Number of segments in sequence
