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AGL1000V2-FGG144I Datasheet(PDF) 32 Page - Actel Corporation

Part No. AGL1000V2-FGG144I
Description  IGLOO Low-Power Flash FPGAs with Flash Freeze Technology
Download  212 Pages
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Maker  ACTEL [Actel Corporation]
Homepage  http://www.actel.com
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AGL1000V2-FGG144I Datasheet(HTML) 32 Page - Actel Corporation

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IGLOO DC and Switching Characteristics
2- 18
Advance v0.5
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:
The average toggle rate of a shift register is 100% because 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
= 50%
Bit 2
= 25%
–…
Bit 7 (MSB) = 0.78125%
Average toggle rate = (100% + 50% + 25% + 12.5% + . . . + 0.78125%) / 8
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 2-22 • Toggle Rate Guidelines Recommended for Power Calculation
Component
Definition
Guideline
α
1
Toggle rate of VersaTile outputs
10%
α
2
I/O buffer toggle rate
10%
Table 2-23 • Enable Rate Guidelines Recommended for Power Calculation
Component
Definition
Guideline
β
1
I/O output buffer enable rate
100%
β
2
RAM enable rate for read operations
12.5%
β
3
RAM enable rate for write operations
12.5%


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