APA300 datasheet(39/178 Pages) ACTEL

39 / 178 page

ProASICPLUS Flash Family FPGAs

v5.9

2-29

Logic-Tile Contribution—Plogic

Plogic, the logic-tile component of AC power dissipation, is given by

Plogic = P3 * mc * Fs

where:

I/O Output Buffer Contribution—Poutputs

Poutputs, the I/O component of AC power dissipation, is given by

Poutputs = (P4 + (Cload * VDDP

2)) * p * Fp

where:

I/O Input Buffer's Buffer Contribution—Pinputs

The input’s component of AC power dissipation is given by

Pinputs = P8 * q * Fq

where:

PLL Contribution—Ppll

Ppll = P9 * Npll

where:

RAM Contribution—Pmemory

Finally, Pmemory, the memory component of AC power consumption, is given by

Pmemory = P6 * Nmemory * Fmemory * Ememory

where:

1.4

μW/MHz is the average power consumption of a logic tile per MHz of its output toggling rate. The

maximum output toggling rate is Fs/2.

the number of logic tiles switching during each Fs cycle

the clock frequency

326

μW/MHz is the intrinsic power consumption of an output pad normalized per MHz of the output

frequency. This is the total I/O current VDDP.

Cload =

the output load

the number of outputs

the average output frequency

μW/MHz is the intrinsic power consumption of an input pad normalized per MHz of the input

frequency.

the number of inputs

the average input frequency

7.5 mW. This value has been estimated at maximum PLL clock frequency.

NPll

number of PLLs used

175 µW/MHz is the average power consumption of a memory block per MHz of the clock

Nmemory

the number of RAM/FIFO blocks

(1 block = 256 words * 9 bits)

Fmemory

the clock frequency of the memory

Ememory

the average number of active blocks divided by the total number of blocks (N) of the memory.

•

Typical values for Ememory would be 1/4 for a 1k x 8,9,16, 32 memory and 1/16 for a 4kx8,

9, 16, and 32 memory configuration

•

In addition, an application-dependent component to Ememory can be considered. For

example, for a 1kx8 memory configuration using only 1 cycle out of 2, Ememory = 1/4*1/2 = 1/8

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