EP3C5M164I7N Datasheet, PDF (169/274 Pages) Altera Corporation – Cyclone III Device Handbook

Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family
Configuration Features
9–11
(during the first frame of configuration data), the INIT_DONE pin goes low. When
initialization is complete, the INIT_DONE pin 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 V_CCINT. 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 Hardwire the MSEL pins to V_CCA 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.
1 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.
Table 9–7. Cyclone III Device Family Configuration Schemes ⁽¹⁾ (Part 1 of 2)
Configuration Scheme
MSEL
3
2
1
0
Fast Active Serial Standard (AS Standard
POR)
0
0
1
0
Fast Active Serial Standard (AS Standard
POR)
0
0
1
1
Fast Active Serial Fast (AS Fast POR)
1
1
0
1
Fast Active Serial Fast (AS Fast POR)
0
1
0
0
Active Parallel ×16 Standard (AP Standard
POR, for Cyclone III devices only)
0
1
1
1
Active Parallel ×16 Standard (AP Standard
POR, for Cyclone III devices only)
1
0
1
1
Active Parallel ×16 Standard (AP Standard
POR, for Cyclone III devices only)
1
0
0
0
Active Parallel ×16 Fast (AP Fast POR, for
Cyclone III devices only)
0
1
0
1
Configuration Voltage Standard (V)
(2), (3)
3.3
3.0/2.5
3.3
3.0/2.5
3.3
3.0/2.5
1.8
3.3
August 2012 Altera Corporation
Cyclone III Device Handbook
Volume 1