EP2SGX30CF780C5N Datasheet, PDF (230/316 Pages) Altera Corporation – Section I. Stratix II GX Device Data Sheet

Timing Model
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 4–52. Stratix II GX Device Timing Model Status
Device
EP2SGX30
EP2SGX60
EP2SGX90
EP2SGX130
Preliminary
Final
v
v
v
v
I/O Timing Measurement Methodology
Different I/O standards require different baseline loading techniques for
reporting timing delays. Altera characterizes timing delays with the
required termination for each I/O standard and with 0 pF (except for PCI
and PCI-X which use 10 pF) loading and the timing is specified up to the
output pin of the FPGA device. The Quartus II software calculates the
I/O timing for each I/O standard with a default baseline loading as
specified by the I/O standards.
The following measurements are made during device characterization.
Altera measures clock-to-output delays (t_CO) at worst-case process,
minimum voltage, and maximum temperature (PVT) for default loading
conditions shown in Table 4–53. Use the following equations to calculate
clock pin to output pin timing for Stratix II GX devices.
t_CO from clock pin to I/O pin = delay from clock pad to I/O output
register + IOE output register clock-to-output delay + delay
from output register to output pin + I/O output delay
t_xz/t_zx from clock pin to I/O pin = delay from clock pad to I/O
output register + IOE output register clock-to-output delay +
delay from output register to output pin + I/O output delay +
output enable pin delay
Simulation using IBIS models is required to determine the delays on the
PCB traces in addition to the output pin delay timing reported by the
Quartus II software and the timing model in the device handbook.
1. Simulate the output driver of choice into the generalized test setup,
using values from Table 4–53.
2. Record the time to V_MEAS.
4–60
Stratix II GX Device Handbook, Volume 1
Altera Corporation
June 2009