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A1010B-2PG84B Fiches technique(PDF) 8 Page - Actel Corporation |
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A1010B-2PG84B Fiches technique(HTML) 8 Page - Actel Corporation |
8 / 24 page 1-290 Equivalent Capacitance The power dissipated by a CMOS circuit can be expressed by the Equation 1. Power (uW) = CEQ * VCC2 * F (1) Where: CEQ is the equivalent capacitance expressed in pF. VCC is the power supply in volts. F is the switching frequency in MHz. Equivalent capacitance is calculated by measuring ICCactive at a specified frequency and voltage for each circuit component of interest. Measurements have been made over a range of frequencies at a fixed value of VCC. Equivalent capacitance is frequency independent so that the results may be used over a wide range of operating conditions. Equivalent capacitance values are shown below. CEQ Values for Actel FPGAs To calculate the active power dissipated from the complete design, the switching frequency of each part of the logic must be known. Equation 2 shows a piece-wise linear summation over all components. Power = VCC 2 * [(m * C EQM * fm)modules + (n * CEQI* fn)inputs + (p * (CEQO+ CL) * fp)outputs + 0.5 * (q1 * CEQCR * fq1)routed_Clk1 + (r1 * fq1)routed_Clk1] (2) Where: Fixed Capacitance Values for Actel FPGAs (pF) r1 Device Type routed_Clk1 A1010B 41.4 A1020B 68.6 A10V10B 40 A10V20B 65 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: A10V10B A10V20B A1010B A1020B Modules (CEQM) 3.2 3.7 Input Buffers (CEQI) 10.9 22.1 Output Buffers (CEQO) 11.6 31.2 Routed Array Clock Buffer Loads (CEQCR) 4.1 4.6 m = Number of logic modules switching at fm n = Number of input buffers switching at fn p = Number of output buffers switching at fp q1 = Number of clock loads on the first routed array clock (All families) r1 = Fixed capacitance due to first routed array clock (All families) CEQM = Equivalent capacitance of logic modules in pF CEQI = Equivalent capacitance of input buffers in pF CEQO = Equivalent capacitance of output buffers in pF CEQCR = Equivalent capacitance of routed array clock in pF CL = Output lead capacitance in pF fm = Average logic module switching rate in MHz fn = Average input buffer switching rate in MHz fp = Average output buffer switching rate in MHz fq1 = Average first routed array clock rate in MHz (All families) Logic Modules (m) 90% of modules Inputs switching (n) #inputs/4 Outputs switching (p) #outputs/4 First routed array clock loads (q1) 40% of 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 |
Numéro de pièce similaire - A1010B-2PG84B |
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Description similaire - A1010B-2PG84B |
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