ep2sgx30c Altera Corporation, ep2sgx30c Datasheet - Page 231

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

Altera Corporation
October 2007
LVTTL
LVCMOS
2.5 V
1.8 V
1.5 V
Table 4–53. Output Timing Measurement Methodology for Output Pins (Part 1 of 2)
(4)
(4)
(4)
(4)
I/O Standard
(4)
3.
4.
5.
The Quartus II software reports the timing with the conditions shown in
Table 4–53
circuit that is represented by the output timing of the Quartus II software.
Figure 4–8. Output Delay Timing Reporting Setup Modeled by Quartus II
Notes to
(1)
(2)
(3)
R
Simulate the output driver of choice into the actual PCB trace and
load, using the appropriate IBIS model or capacitance value to
represent the load.
Record the time to V
Compare the results of steps 2 and 4. The increase or decrease in
delay should be added to or subtracted from the I/O Standard
Output Adder delays to yield the actual worst-case propagation
delay (clock-to-output) of the PCB trace.
Output pin timing is reported at the output pin of the FPGA device. Additional
delays for loading and board trace delay need to be accounted for with IBIS model
simulations.
V
V
S
CCPD
CCINT
(
Ω
Output
Buffer
Figure
V
)
GND
CCIO
is 3.085 V unless otherwise specified.
is 1.12 V unless otherwise specified.
using the above equation.
R
4–8:
D
(
Output
Ω
Loading and Termination
)
V
MEAS
R
T
MEAS
(
Ω
)
R
.
S
V
CCIO
3.135
3.135
2.375
1.710
1.425
GND
V
Stratix II GX Device Handbook, Volume 1
TT
R
C
(V)
Figure 4–8
T
L
DC and Switching Characteristics
V
TT
(V)
shows the model of the
C
Notes
L
(pF)
0
0
0
0
0
Output
Output
(1), (2),
Measurement
p
n
V
1.5675
1.5675
1.1875
0.7125
MEAS
0.855
R
Point
D
(3)
(V)
4–61