Logic Design for Array-Based Circuits
Copyright © 1996, 2001, 2002 Donnamaie E. White
Last Edit July 22, 2001
Step 5: Compute AC Power For all ECL Input Macros
Using the counts from step 4, compute the AC power dissipated by the ECL inputs used in the circuit. For AMCC arrays, use:
PacI = f * n * 3.25 microwatts
Step 6: Find the Number of Internal Macros
Using the macro occurrence worksheet, find the number of internal macros. For AMCC customers, the number of internal macros can be determined from the AMCC Population ERC report.
Step 7: Compute AC Power For all Internal Macros
Using the count from step 6, estimate the AC power dissipated by the internal macros used in the circuit:
PacI = 0.20 * f * n * 3.25 microwatts
Step 8: Sum All Components of AC Power
Sum the results together and convert to watts (or to the same units as was used for DC power). This equation provides an estimate of the worst-case AC power dissipation for the Q20000 array.
PdAC = PacI + Pacinternal + PacDARoutputs
Use the same equation for military and commercial computations.