EP4CE40 datasheet(229/488 Pages) ALTERA

229 / 488 page

Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices

8–65

Configuration

May 2013

Altera Corporation

Cyclone IV Device Handbook,

Volume 1

CONF_DONE

N/A

All

Bidirectional

open-drain

■ Status output—the target Cyclone IV device drives the

CONF_DONE

pin low before and during configuration.

After all the configuration data is received without error

and the initialization cycle starts, the target device

releases CONF_DONE.

■ Status input—after all the 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

Ω 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 CONF_DONE pin.

nCE

N/A

All

Input

Active-low chip enable. The nCE pin activates the Cyclone

IV device with a low signal to allow configuration. You must

hold nCE pin low during configuration, initialization, and

user-mode. In a single-device configuration, you must tie

the nCE pin low. In a multi-device configuration, nCE of the

first device is tied low while its nCEO pin is connected to

nCE

of the next device in the chain. You must hold the nCE

pin low for successful JTAG programming of the device.

nCEO

N/A if

option is on.

I/O if option

is off.

All

Output

open-drain

Output that drives low when configuration is complete. In a

single-device configuration, you can leave this pin floating

or use it as a user I/O pin after configuration. In a multi-

device configuration, this pin feeds the nCE pin of the next

device. The nCEO of the last device in the chain is left

floating or used as a user I/O pin after configuration.

If you use the nCEO pin to feed the nCE pin of the next

device, use an external 10-k

Ω pull-up resistor to pull the

nCEO

pin high to the VCCIO voltage of its I/O bank to help the

internal weak pull-up resistor.

If you use the nCEO pin as a user I/O pin after configuration,

set the state of the pin on the Dual-Purpose Pin settings.

nCSO

FLASH_nCE

(1)

I/O

AS, AP (2)

Output

Output control signal from the Cyclone IV device to the

serial configuration device in AS mode that enables the

configuration device. This pin functions as nCSO in AS

mode and FLASH_nCE in AP mode.

Output control signal from the Cyclone IV device to the

parallel flash in AP mode that enables the flash. Connects to

the CE# pin on the Micron P30 or P33 flash. (2)

This pin has an internal pull-up resistor that is always

active.

Table 8–20. Dedicated Configuration Pins on the Cyclone IV Device (Part 2 of 4)

Pin Name

User Mode

Configuration

Scheme

Pin Type

Description

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