CDPCLK4 datasheet(235/274 Pages) ALTERA

235 / 274 page

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

9–77

Remote System Upgrade

August 2012

Altera Corporation

Cyclone III Device Handbook

Volume 1

Configuration Image Types

When using remote system upgrade, Cyclone III device family configuration

bitstreams are classified as factory configuration images or application configuration

images. An image, also referred to as a configuration, is a design loaded into the

device that performs certain user-defined functions. Each device in your system

requires one factory image with the addition of one or more application images. The

factory image is a user-defined fall-back, or safe, configuration and is responsible for

administering remote updates with dedicated circuitry. Application images

implement user-defined functionality in the target Cyclone III device family. You can

include the default application image functionality in the factory image.

Remote System Upgrade Mode

In remote update mode, the Cyclone III device family loads the factory configuration

image after power-up. The user-defined factory configuration determines which

application configuration is to be loaded and triggers a reconfiguration cycle. The

factory configuration can also contain application logic.

When used with configuration memory, remote update mode allows an application

configuration to start at any flash sector boundary. Additionally, the remote update

mode features a user watchdog timer that can detect functional errors in an

application configuration.

Remote Update Mode

When a Cyclone III device family is first powered up in remote update in the AS

configuration scheme, it loads the factory configuration located at address

boot_address[23:0] = 24b'0

. Altera recommends storing the factory configuration

image for your system at boot address 24b'0 when using the AS configuration

scheme. A factory configuration image is a bitstream for Cyclone III device family in

your system that is programmed during production and is the fall-back image when

an error occurs. This image is stored in non-volatile memory and is never updated or

modified using remote access. This corresponds to the start address location 0x000000

in the serial configuration device.

When you use the AP configuration in Cyclone III devices, the Cyclone III device

loads the default factory configuration located at the following address after device

power-up in remote update mode:

boot_address[23:0] = 24'h010000 = 24'b1 0000 0000 0000 0000

You can change the default factory configuration address to any desired address using

the APFC_BOOT_ADDR JTAG instruction. The factory configuration image is stored in

non-volatile memory and is never updated or modified using remote access. This

corresponds to the default start address location 0x010000 represented in 16-bit word

addressing (or the updated address if the default address is changed) in the

supported parallel flash memory. For more information about the application of the

APFC_BOOT_ADDR

JTAG instruction in AP configuration scheme, refer to “JTAG

Instructions” on page 9–60.

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