EP1C20F datasheet(79/106 Pages) ALTERA

79 / 106 page

Altera Corporation

4–9

May 2008

Preliminary

Timing Model

Typically, the user-mode current during device operation is lower than

the power-up current in Table 4–17. Altera recommends using the

Cyclone Power Calculator, available on the Altera web site, to estimate

the user-mode ICCINT consumption and then select power supplies or

regulators based on the higher value.

Timing Model

The DirectDrive technology and MultiTrack interconnect ensure

predictable performance, accurate simulation, and accurate timing

analysis across all Cyclone device densities and speed grades. This

section describes and specifies the performance, internal, external, and

PLL timing specifications.

All specifications are representative of worst-case supply voltage and

junction temperature conditions.

Preliminary and Final Timing

Timing models can have either preliminary or final status. The

Quartus® II software issues an informational message during the design

compilation if the timing models are preliminary. Table 4–18 shows the

status of the Cyclone device timing models.

Preliminary status means the timing model is subject to change. Initially,

timing numbers are created using simulation results, process data, and

other known parameters. These tests are used to make the preliminary

numbers as close to the actual timing parameters as possible.

Final timing numbers are based on actual device operation and testing.

These numbers reflect the actual performance of the device under

worst-case voltage and junction temperature conditions.

Table 4–18. Cyclone Device Timing Model Status

Device

Preliminary

Final

EP1C3

—

EP1C4

—

EP1C6

—

EP1C12

—

EP1C20

—

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