CDPCLK4 datasheet(224/274 Pages) ALTERA

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

Configuration Features

Cyclone III Device Handbook

August 2012

Altera Corporation

Volume 1

Table 9–22 lists the dedicated configuration pins that must be connected properly on

your board for successful configuration. Some of these pins may not be required for

your configuration scheme.

Table 9–22. Dedicated Configuration Pins on Cyclone III Device Family (Part 1 of 4)

Pin Name

User

Mode

Configuration

Scheme

Pin Type

Description

MSEL [3..0]

N/A

All

Input

4-bit configuration input that sets the Cyclone III device

family configuration scheme. These pins must be hardwired

to VCCA or GND. The MSEL[3..0] pins have internal 9-k

pull-down resistors that are always active.

Some of the smaller devices or package options of

Cyclone III devices do not have the MSEL[3] pin; therefore,

the AP configuration scheme is not supported.

nCONFIG

N/A

All

Input

Configuration control input. Pulling this pin low with external

circuitry during user mode causes the Cyclone III device

family to lose its configuration data, enter a reset state, and

tri-state all I/O pins. Returning this pin to a logic-high level

starts a reconfiguration.

nSTATUS

N/A

All

Bidirectional

open-drain

The Cyclone III device family drives nSTATUS low

immediately after power-up and releases it after the POR

time.

■ Status output. If an error occurs during configuration,

nSTATUS

is pulled low by the target device.

■ Status input. If an external source (for example, another

Cyclone III device family) drives the nSTATUS pin low

during configuration or initialization, the target device

enters an error state.

Driving nSTATUS low after configuration and initialization

does not affect the configured device. If you use a

configuration device, driving nSTATUS low causes the

configuration device to attempt to configure the device, but

because the device ignores transitions on nSTATUS in user

mode, the device does not reconfigure. To start a

reconfiguration, nCONFIG must be pulled low.

CONF_DONE

N/A

All

Bidirectional

open-drain

■ Status output. The target Cyclone III device family drives

the CONF_DONE pin low before and during configuration.

After all configuration data is received without error and

the initialization cycle starts, the target device releases

CONF_DONE.

■ Status input. After all data is received and CONF_DONE

goes high, the target device initializes and enters user

mode. The CONF_DONE pin must have an external 10-k



pull-up resistor in order for the device to initialize.

Driving CONF_DONE low after configuration and initialization

does not affect the configured device. Do not connect bus

holds or ADC to the CONF_DONE pin.

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