EP3C5E144C8N Datasheet, PDF (340/348 Pages) Altera Corporation – Ability to disable external JTAG port

2–26
Chapter 2: Cyclone III LS Device Data Sheet
I/O Timing
Table 2–38. Cyclone III LS Devices IOE Programmable Delay on Row Pins ^{(1), (2)}
Parameter
Max Offset
Paths Affected
Number
of
setting
Min
Offset
Fast Corner
Slow Corner
Unit
I7 C7 C7 C8 I7
Input delay from the
dual-purpose clock pin to the
fan-out destinations
Pad to global
clock network
12
0
0.52 0.54 1.052 1.16 1.061 ns
Notes to Table 2–38:
(1) The incremental values for the settings are generally linear. For the exact values of each setting, use the latest version of the Quartus II software.
(2) The minimum and maximum offset timing numbers refer to the 0 setting available in the Quartus II software.
I/O Timing
DirectDrive technology and MultiTrack interconnect ensure predictable performance,
accurate simulation, and accurate timing analysis across all Cyclone III LS device
densities and speed grades.
Use the following methods to determine I/O timing:
■ The Excel-based I/O timing
■ The Quartus II Timing Analyzer
Excel-based I/O timing provides pin timing performance for each device density and
speed grade. The data is typically used before designing the FPGA to get a timing
budget estimation as part of the link timing analysis. The Quartus II Timing Analyzer
provides a more accurate and precise I/O timing data based on the specifics of the
design after place-and-route is complete.
f For more information about the Excel-based I/O timing spreadsheet, refer to the
Cyclone III Devices Literature page on the Altera website.
All specifications are representative of worst-case supply voltage and junction
temperature conditions. 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).
f For more information about timing delay from the FPGA output to the receiving
device for system-timing analysis, refer to AN 366: Understanding I/O Output Timing
for Altera Devices.
Glossary
Table 2–39 lists the glossary for this chapter.
Table 2–39. Glossary (Part 1 of 6)
Letter
Term
A
—
B
—
C
—
Definitions
—
—
—
Cyclone III Device Handbook
Volume 2
December 2011 Altera Corporation