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DC and Power Characteristics
3-28
Revision 4
Example of Power Calculation
This example considers a shift register with 5,000 storage tiles, including a counter and memory that
stores analog information. The shift register is clocked at 50 MHz and stores and reads information from
a RAM.
The device used is a commercial AFS600 device operating in typical conditions.
The calculation below uses the power calculation methodology previously presented and shows how to
determine the dynamic and static power consumption of resources used in the application.
Also included in the example is the calculation of power consumption in operating, standby, and sleep
modes to illustrate the benefit of power-saving modes.
Global Clock Contribution鈥擯CLOCK
FCLK = 50 MHz
Number of sequential VersaTiles: NS-CELL = 5,000
Estimated number of Spines: NSPINES = 5
Estimated number of Rows: NROW = 313
Operating Mode
PCLOCK = (PAC1 + NSPINE * PAC2 + NROW * PAC3 + NS-CELL * PAC4) * FCLK
PCLOCK = (0.0128 + 5 * 0.0019 + 313 * 0.00081 + 5,000 * 0.00011) * 50
PCLOCK = 41.28 mW
Standby Mode and Sleep Mode
PCLOCK = 0 W
Logic鈥擲equential Cells, Combinational Cells, and Routing Net Contributions鈥擯S-CELL,
PC-CELL, and PNET
FCLK = 50 MHz
Number of sequential VersaTiles: NS-CELL = 5,000
Number of combinatorial VersaTiles: NC-CELL = 6,000
Estimated toggle rate of VersaTile outputs:
1 = 0.1 (10%)
Operating Mode
PS-CELL = NS-CELL * (PAC5+ (1 / 2) * PAC6) * FCLK
PS-CELL = 5,000 * (0.00007 + (0.1 / 2) * 0.00029) * 50
PS-CELL = 21.13 mW
PC-CELL = NC-CELL* (1 / 2) * PAC7 * FCLK
PC-CELL = 6,000 * (0.1 / 2) * 0.00029 * 50
PC-CELL = 4.35 mW
PNET = (NS-CELL + NC-CELL) * (1 / 2) * PAC8 * FCLK
PNET = (5,000 + 6,000) * (0.1 / 2) * 0.0007 * 50
PNET = 19.25 mW
PLOGIC = PS-CELL + PC-CELL + PNET
PLOGIC = 21.13 mW + 4.35 mW + 19.25 mW
PLOGIC = 44.73 mW
Standby Mode and Sleep Mode
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