Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family
9–11
Configuration Features
(during the first frame of configuration data), the INIT_DONEpin goes low. When
initialization is complete, the INIT_DONEpin is released and pulled high. This low-to-
high transition signals that the device has entered user mode. In user mode, the user
I/O pins function as assigned in your design and no longer have weak pull-up
resistors.
Configuration Scheme
A configuration scheme with different configuration voltage standards is selected by
driving the MSEL pins either high or low, as listed in Table 9–7.
The MSEL pins are powered by VCCINT. The MSEL[3..0]pins have 9-k internal
pull-down resistors that are always active.
1
Smaller Cyclone III devices or package options (E144, M164, Q240, F256, and U256
packages) do not have the MSEL[3]pin. The AS Fast POR configuration scheme at 3.0-
or 2.5-V configuration voltage standard and the AP configuration scheme are not
supported in Cyclone III devices without the MSEL[3] pin. To configure these devices
with other supported configuration schemes, select the MSEL[2..0]pins according to
the MSEL settings in Table 9–7.
1
1
Hardwire the MSEL pins to VCCA or GND without any pull-up or pull-down resistors
to avoid any problems detecting an incorrect configuration scheme. Do not drive the
MSEL pins with a microprocessor or another device.
The Quartus II software prohibits you from using the LVDS I/O standard in I/O
Bank 1 when the configuration device I/O voltage is not 2.5 V. If you need to assign
LVDS I/O standard in I/O Bank 1, navigate to
Assignments>Device>Settings>Device and Pin Option>Configuration to change the
Configuration Device I/O voltage to 2.5 V or Auto.
(1)
Table 9–7. Cyclone III Device Family Configuration Schemes
Configuration Scheme
(Part 1 of 2)
MSEL
Configuration Voltage Standard (V)
(2), (3)
3
2
1
0
Fast Active Serial Standard (AS Standard
POR)
0
0
1
0
3.3
Fast Active Serial Standard (AS Standard
POR)
0
0
1
1
3.0/2.5
Fast Active Serial Fast (AS Fast POR)
Fast Active Serial Fast (AS Fast POR)
1
0
1
1
0
0
1
0
3.3
3.0/2.5
Active Parallel ×16 Standard (AP Standard
POR, for Cyclone III devices only)
0
1
1
0
1
0
0
1
1
1
0
0
1
1
0
1
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
August 2012 Altera Corporation
Cyclone III Device Handbook
Volume 1
ALTERA [ ALTERA CORPORATION ]
