9–6
Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family
Configuration Features
In Cyclone III device family, you can select either a fast POR time or standard POR
time depending on the MSEL pin settings. The fast POR time is 3 ms < TPOR < 9 ms
for the fast configuration time. The standard POR time is 50 ms < TPOR < 200 ms,
which has a lower power-ramp rate.
Table 9–2 lists the supported POR times for each configuration scheme.
Table 9–2. Cyclone III Device Family Supported POR Times Across Configuration Schemes (1)
Configuration
Voltage
Fast POR Time
Standard POR Time
Configuration Scheme
(3 ms< TPOR < 9 ms) (50 ms< TPOR < 200 ms)
Standard (V) (2)
Fast Active Serial Standard (AS Standard POR)
Fast Active Serial Standard (AS Standard POR)
Fast Active Serial Fast (AS Fast POR)
—
—
v
v
v
v
—
—
3.3
3.0/2.5
3.3
Fast Active Serial Fast (AS Fast POR)
3.0/2.5
Active Parallel ×16 Standard (AP Standard POR, for
Cyclone III devices only)
—
—
—
v
v
v
v
v
—
—
3.3
3.0/2.5
1.8
Active Parallel ×16 Standard (AP Standard POR, for
Cyclone III devices only)
Active Parallel ×16 Standard (AP Standard POR, for
Cyclone III devices only)
Active Parallel ×16 Fast (AP Fast POR, for
Cyclone III devices only)
3.3
Active Parallel ×16 Fast (AP Fast POR, for
Cyclone III devices only)
1.8
Passive Serial Standard (PS Standard POR)
Passive Serial Fast (PS Fast POR)
Fast Passive Parallel Fast (FPP Fast POR)
Fast Passive Parallel Fast (FPP Fast POR)
JTAG-based configuration
—
v
v
v
—
—
3.3/3.0/2.5
3.3/3.0/2.5
3.3/3.0/2.5
1.8/1.5
v
—
(3)
(3)
—
Notes to Table 9–2:
(1) Altera recommends connecting the MSEL pins to VCCA or GND depending on the MSEL pin settings.
(2) The configuration voltage standard is applied to the VCCIO supply of the bank in which the configuration pins reside.
(3) JTAG-based configuration takes precedence over other configuration schemes, which means the MSEL pin settings are ignored. However, the
POR time is dependent on the MSEL pin settings.
In some applications, it is necessary for a device to wake up very quickly to begin
operation. The Cyclone III device family offers the fast POR time option to support
fast wake-up time applications. The fast POR time option has stricter power-up
requirements when compared with the standard POR time option. You can select
either the fast POR or standard POR options with the MSEL pin settings.
1
The automotive application is for Cyclone III devices only. The Cyclone III devices
fast wake-up time meets the requirement of common bus standards in automotive
applications, such as Media Orientated Systems Transport (MOST) and Controller
Area Network (CAN).
f
For more information about wake-up time and the POR circuit, refer to the
Hot-Socketing and Power-On Reset in Cyclone III Devices chapter.
Cyclone III Device Handbook
Volume 1
August 2012 Altera Corporation
ALTERA [ ALTERA CORPORATION ]
