AGLE3000V2-FFG896 ACTEL [Actel Corporation], AGLE3000V2-FFG896 Datasheet - Page 29
![no-image](/images/no-image-200.jpg)
AGLE3000V2-FFG896
Manufacturer Part Number
AGLE3000V2-FFG896
Description
IGLOOe Low-Power Flash FPGAs with Flash Freeze Technology
Manufacturer
ACTEL [Actel Corporation]
Datasheet
1.AGLE3000V2-FFG896.pdf
(156 pages)
- Current page: 29 of 156
- Download datasheet (6Mb)
Guidelines
Toggle Rate Definition
A toggle rate defines the frequency of a net or logic element relative to a clock. It is a percentage.
If the toggle rate of a net is 100%, this means that this net switches at half the clock frequency.
Below are some examples:
Enable Rate Definition
Output enable rate is the average percentage of time during which tristate outputs are enabled.
When nontristate output buffers are used, the enable rate should be 100%.
Table 2-18 • Toggle Rate Guidelines Recommended for Power Calculation
Table 2-19 • Enable Rate Guidelines Recommended for Power Calculation
Component
α
α
Component
β
β
β
1
2
3
1
2
•
•
The average toggle rate of a shift register is 100% as all flip-flop outputs toggle at half of
the clock frequency.
The average toggle rate of an 8-bit counter is 25%:
–
–
–
–
–
–
Bit 0 (LSB) = 100%
Bit 1
Bit 2
…
Bit 7 (MSB) = 0.78125%
Average toggle rate = (100% + 50% + 25% + 12.5% + . . . + 0.78125%) / 8
= 50%
= 25%
Toggle rate of VersaTile outputs
I/O buffer toggle rate
I/O output buffer enable rate
RAM enable rate for read operations
RAM enable rate for write operations
A dv a n c e v 0. 3
Definition
Definition
IGLOOe DC and Switching Characteristics
Guideline
Guideline
12.5%
12.5%
100%
10%
10%
2 - 15
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