I/O Structure
shows the possible settings for the I/O standards with drive
strength control.
Table 2–28. Programmable Drive Strength
I/O Standard
3.3-V LVTTL
3.3-V LVCMOS
2.5-V LVTTL/LVCMOS
1.8-V LVTTL/LVCMOS
1.5-V LVCMOS
GTL/GTL+
1.5-V HSTL Class I and II
1.8-V HSTL Class I and II
SSTL-3 Class I and II
SSTL-2 Class I and II
SSTL-18 Class I and II
Notes to
(1)
(2)
This is the Quartus II software default current setting.
I/O banks 1, 2, 5, and 6 do not support this setting.
I
OH
/ I
OL
Current Strength Setting (mA)
24
16, 12, 8, 4
24
12
8, 4, 2
16
12, 8, 2
12
8, 2
8
4, 2
Support max and min strength
Quartus II software version 4.2 and later will report current strength as
“PCI Compliant” for 3.3-V PCI, 3.3-V PCI-X 1.0, and Compact PCI I/O
standards.
Stratix devices support series on-chip termination (OCT) using
programmable drive strength. For more information, contact your Altera
Support Representative.
Open-Drain Output
Stratix devices provide an optional open-drain (equivalent to an open-
collector) output for each I/O pin. This open-drain output enables the
device to provide system-level control signals (e.g., interrupt and write-
enable signals) that can be asserted by any of several devices.
Slew-Rate Control
The output buffer for each Stratix device I/O pin has a programmable
output slew-rate control that can be configured for low-noise or high-
speed performance. A faster slew rate provides high-speed transitions for
high-performance systems. However, these fast transitions may
introduce noise transients into the system. A slow slew rate reduces
system noise, but adds a nominal delay to rising and falling edges. Each
2–120
Stratix Device Handbook, Volume 1
Altera Corporation
July 2005
ALTERA [ ALTERA CORPORATION ]
