EP3SL110F1152C2N Datasheet, PDF (41/341 Pages) Altera Corporation – Stratix III Device Handbook,

Chapter 1: Stratix III Device Datasheet: DC and Switching Characteristics
I/O Timing
1–31
Preliminary and Final Timing
Timing models can have either preliminary or final status. The Quartus II software
issues an informational message during design compilation if the timing models are
preliminary. Table 1–36 lists the status of the Stratix III device timing models.
Preliminary status means that the timing models are subject to change in future
Quartus II releases. Initially, timing numbers are created using simulation results,
process data, and other known parameters. Parts of the timing models may be
correlated to silicon measurements. Various tests are used to make the preliminary
numbers as close to the actual timing parameters as possible.
Final timing models are based on simulation models that are characterized versus the
actual device measurements under all allowable operating conditions. When the
timing models are final, all or most of the Stratix III family devices have been
completely characterized and no further changes to the timing model are expected.
Table 1–36. Timing Model Status for Stratix III Devices
EP3SL50
EP3SL70
EP3SL110
EP3SL150
EP3SL200
EP3SL340
EP3SE50
EP3SE80
EP3SE110
EP3SE260
Device
Preliminary
—
—
—
—
—
—
—
—
—
—
Final
v
v
v
v
v
v
v
v
v
v
I/O Timing Measurement Methodology
Altera characterizes timing delays at the worst-case process, minimum voltage, and
maximum temperature for input register setup time (t_su) and hold time (t_h). The
Quartus II software uses the following equations to calculate t_su and t_h timing for the
Stratix III devices input signals.
t_su =
+ data delay from the input pin to the input register
+ micro setup time of the input register
- clock delay from the input pin to the input register
t_h =
- data delay from the input pin to the input register
+ micro hold time of the input register
+ clock delay from the input pin to the input register
© July 2010 Altera Corporation
Stratix III Device Handbook, Volume 2