Sampling data backup SRAM (or DRAM) usage capacity differs depending on the Number of Sampling Groups, Data Length, Number of Data (Addresses) and the contents of the action settings.
Without the sampling settings, the usage capacity is 0 bytes.
Calculation
Usage capacity per group (in bytes)
|
20 + Blocks x Cycles*2 x [(Number of Data + 31)/32 x 4*3 + 2*5 x Number of Data*1 + 12*4] |
*1 When the Number of Data is an odd number, this value becomes [Data Items] (the portion in bold)+1.
*2 When in the [Mode] tab's Extended area the [Overwrite old data after finishing the specified cycles] check box is selected, this value becomes [Cycles] + 1.
*3 When [Add Data Valid/Invalid Flag] is selected in the action settings, this portion size (the underlined portion) is added.
*4 When [Add Time Data] is designated in the 4 action settings, 12 bytes will be added to each sample as time data.
*5 2 bytes when the data length is 16 bit, 4 bytes when the data length is 32 bit.
Usage capacity for whole system (in bytes)
|
(4 + 4 x Number of Groups) + each Sampling Group's total usage capacity |
Calculation Examples
|
Setting |
Description |
|---|---|
|
Number of Groups |
1 |
|
Data Type |
16 Bit |
|
Blocks |
1 |
|
Occurrences |
100 |
|
Number of Data (Addresses) |
7 |
Example 1) [Overwrite old data after finishing the specified cycles] is cleared, [Add Time Data] is cleared, [Add Data Valid/Invalid Flag] is selected.
[Calculation]
(4 + 4 x Number of Groups) + [20 + Blocks x Cycles x {(Number of Data + 31)/32 x 4 + 2 x (Number of Data + 1)}]
[Calculation result]
(4＋4×1)＋[20＋1×100×{(7＋31)÷32×4＋2×(7＋1)}]
= 2103 bytes
Example 2) [Overwrite old data after finishing the specified cycles] is selected, [Add Time Data] is selected, [Add Data Valid/Invalid Flag] is selected
Calculation
(4 + 4 x Number of Groups) + [20 + Blocks x (Cycles + 1) x {(Number of Data + 31)/32 x 4 + 2 x (Number of Data + 1) + 12}]
[Calculation result]
(4＋4×1)＋[20＋1×(100＋1)×{(7＋31)÷32×4＋2×(7＋1)＋12}]
= 3260 bytes
Indication of the number of sampling data you can save
The storage size of backup SRAM is the maximum of approximately 320 KB, depending on the type of display unit. The maximum capacity of temporary storage (DRAM) is 320 KB. The maximum number of samples for the entire sampling group is 163,244.
However, when backup SRAM is used for other features, the capacity for sampling data decreases.
|
Condition |
Backup SRAM (Used for Sampling Only) |
DRAM |
|
Word data only |
Up to 81,332 |
Up to 81,912 |
|
Word data + Time data |
Up to 20,332 |
Up to 20,476 |
|
Word data + Word data + Data Valid/Invalid Flag |
Up to 40,664 |
Up to 40,954 |
|
Word data + Time data + Data Valid/Invalid Flag |
Up to 16,264 |
Up to 16,380 |