ep2sgx30c Altera Corporation, ep2sgx30c Datasheet - Page 230

• Manufacturer Part Number: ep2sgx30c
• Description: Stratix Ii Gx Device Data Sheet
• Manufacturer: Altera Corporation

Timing Model
4–60
Stratix II GX Device Handbook, Volume 1
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.
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
minimum voltage, and maximum temperature (PVT) for default loading
conditions shown in
clock pin to output pin timing for Stratix II GX devices.
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.
2.
Table 4–52. Stratix II GX Device Timing Model Status
t
t
Simulate the output driver of choice into the generalized test setup,
using values from
Record the time to V
CO
xz
EP2SGX130
/t
EP2SGX30
EP2SGX60
EP2SGX90
from clock pin to I/O pin = delay from clock pad to I/O output
Device
register + IOE output register clock-to-output delay + delay
from output register to output pin + I/O output delay
zx
output register + IOE output register clock-to-output delay +
delay from output register to output pin + I/O output delay +
output enable pin delay
from clock pin to I/O pin = delay from clock pad to I/O
Table
Table
MEAS
4–53. Use the following equations to calculate
4–53.
.
Preliminary
CO
) at worst-case process,
Altera Corporation
Final
v
v
v
v
October 2007