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AGL1000V2-FGG144I Datasheet(PDF) 32 Page - Actel Corporation |
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AGL1000V2-FGG144I Datasheet(HTML) 32 Page - Actel Corporation |
32 / 212 page 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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