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A1440AA-1CQ208M Datasheet(PDF) 18 Page - Actel Corporation |
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A1440AA-1CQ208M Datasheet(HTML) 18 Page - Actel Corporation |
18 / 68 page 1-192 Fixed Capacitance Values for Actel FPGAs (pF) Fixed Clock Loads (s1/s2) Determining Average Switching Frequency To determine the switching frequency for a design, you must have a detailed understanding of the data input values to the circuit. The following guidelines are meant to represent worst-case scenarios so that they can be generally used to predict the upper limits of power dissipation. These guidelines are as follows: r1 r2 Device Type routed_Clk1 routed_Clk2 A1415A 60 60 A14V15A 57 57 A1425A 75 75 A14V25A 72 72 A1440A 105 105 A14V40A 100 100 A1440B 105 105 A1460A 165 165 A14V60A 157 157 A1460B 165 165 A14100A 195 195 A14V100A 185 185 A14100B 195 195 s1 s2 Clock Loads on Clock Loads on Device Type dedicated array clock dedicated I/O clock A1415A 104 80 A14V15A 104 80 A1425A 160 100 A14V25A 160 100 A1440A 288 140 A14V40A 288 140 A1440B 288 140 A1460A 432 168 A14V60A 432 168 A1460B 432 168 A14100A 697 228 A14V100A 697 228 A14100B 697 228 Logic Modules (m) = 80% of modules Inputs switching (n) = # inputs/4 Outputs switching (p) = # output/4 First routed array clock loads (q1) = 40% of sequential modules Second routed array clock loads (q2) = 40% of sequential modules Load capacitance (CL) = 35 pF Average logic module switching rate (fm) = F/10 Average input switching rate (fn) = F/5 Average output switching rate (fp) = F/10 Average first routed array clock rate (fq1) = F/2 Average second routed array clock rate (fq2) = F/2 Average dedicated array clock rate (fs1) = F Average dedicated I/O clock rate (fs2) = F |
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