EP3C80 datasheet(169/274 Pages) ALTERA

169 / 274 page

Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family

9–11

Configuration Features

August 2012

Altera Corporation

Cyclone III Device Handbook

Volume 1

(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 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 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.

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

Configuration Voltage Standard (V)

(2), (3)

Fast Active Serial Standard (AS Standard

POR)

3.3

Fast Active Serial Standard (AS Standard

POR)

3.0/2.5

Fast Active Serial Fast (AS Fast POR)

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)

3.3

Active Parallel ×16 Standard (AP Standard

POR, for Cyclone III devices only)

3.0/2.5

Active Parallel ×16 Standard (AP Standard

POR, for Cyclone III devices only)

1.8

Active Parallel ×16 Fast (AP Fast POR, for

Cyclone III devices only)

3.3

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