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Keysight M8190A - 3.11 Limitations

Keysight M8190A
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Sequencing 3
M8190A User’s Guide 125
3.11 Limitations
3.11.1 Segment Length and Linear Playtime
Due to the type of memory technology and the implementation of the memory
interface, every physical address jump within the sample memory will reduce the
bandwidth at the memory interface. The drawing below shows such an address jump.
Memory Layout
Segment
A
Segment
B
Address Jump
Figure 3-34: Address jump within segments
To put the density of address jumps below a limit, a minimum segment length of 257
sample vectors (big segment) is required. Small segments (256 vectors down to 5
vectors) are also possible but then the linear playtime requirement must be met.
Linear Playtime Requirement:
The playtime of at least 257 sample vectors (257 sync clock cycles) must be placed
in the sample memory in an ascending address order. When writing samples to a
totally cleared memory, the order of segments is the order of how these segments
are written to the memory.
Idle delay segments are also considered in computing the playtime. The
corresponding playtime in sample vectors is computed from the idle delay value.
When the data segments before and after the idle delay segment are adjacent in
memory the playtime is computed as the sum of all three segments.
The last adjacent segments in a sequence in sequence mode or the last adjacent
segments in a scenario in scenario mode can be shorter than 257 sample vectors in
total.

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