ACEX1 datasheet(82/86 Pages) ETC

82 / 86 page

Altera Corporation

ACEX 1K Programmable Logic Device Family Data Sheet

The ICCACTIVE value can be calculated with the following equation:

ICCACTIVE = K × fMAX × N × togLC (µA)

Where:

fMAX

Maximum operating frequency in MHz

Total number of LEs used in the device

togLC

Average percent of LEs toggling at each clock

(typically 12.5%)

Constant

Table 58 provides the constant (K) values for ACEX 1K devices.

This supply power calculation provides an ICC estimate based on typical

conditions with no output load. The actual ICC should be verified during

operation because this measurement is sensitive to the actual pattern in

the device and the environmental operating conditions.

To better reflect actual designs, the power model (and the constant K in

the power calculation equations) for continuous interconnect ACEX 1K

devices assumes that LEs drive FastTrack Interconnect channels. In

contrast, the power model of segmented FPGAs assumes that all LEs

drive only one short interconnect segment. This assumption may lead to

inaccurate results when compared to measured power consumption for

actual designs in segmented FPGAs.

Figure 31 shows the relationship between the current and operating

frequency of ACEX 1K devices. For information on other ACEX 1K

devices, contact Altera Applications at (800) 800-EPLD.

Table 58. ACEX 1K Constant Values

Device

K Value

EP1K10

4.5

EP1K30

4.5

EP1K50

4.5

EP1K100

4.5

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