EP3C80 datasheet(161/274 Pages) ALTERA

161 / 274 page

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

9–3

Configuration Features

August 2012

Altera Corporation

Cyclone III Device Handbook

Volume 1

1 The design security feature is for Cyclone III LS devices only and is available in all

configuration schemes except the JTAG-based configuration. The decompression

feature is not supported when you have enabled the design security feature.

1 When using a serial configuration scheme such as PS or fast AS, the configuration

time is the same whether or not you have enabled the design security feature. A ×4

DCLK

is required if you use the FPP scheme with the design security feature.

1 Cyclone III devices support remote system upgrade in AS and AP configuration

schemes. Cyclone III LS devices only support remote system upgrade in the AS

configuration scheme.

This section only describes the decompression feature. For more information about

the design security and remote system upgrade, refer to “Design Security” on

page 9–70 and “Remote System Upgrade” on page 9–74.

Configuration Data Decompression

Cyclone III device family supports configuration data decompression, which saves

configuration memory space and time. This feature allows you to store compressed

configuration data in configuration devices or other memory and send the

compressed bitstream to Cyclone III device family. During configuration, Cyclone III

device family decompress the bitstream in real time and program SRAM cells. The

decompression feature is not supported when you have enabled the design security

feature.

1 Compression may reduce the configuration bitstream size by 35 to 55%.

Cyclone III device family supports decompression in the AS and PS configuration

schemes. Decompression is not supported in the AP, FPP, or JTAG-based

configuration schemes. In PS mode, use the Cyclone III device family decompression

feature to reduce configuration time.

1 Altera recommends using the Cyclone III device family decompression feature during

AS configuration if you must save configuration memory space in the serial

configuration device.

JTAG based configuration

External Host with

Flash Memory

——

—

Download Cable

—

Notes to Table 9–1:

(1) Remote update mode is supported when using the remote system upgrade feature. You can enable or disable remote update mode with an option

setting in the Quartus® II software. For more information about the remote system upgrade feature, refer to “Remote System Upgrade” on

page 9–74.

(2) For more information about the supported families for the Micron commodity parallel flash, refer to Table 9–11 on page 9–24.

(3) The design security feature is not supported using a SRAM Object File (.sof).

Table 9–1. Cyclone III Device Family Configuration Features (Part 2 of 2)

Configuration Scheme

Configuration

Method

Decompression

Remote

System

Upgrade

(1)

Design

Security

(Cyclone III LS

Devices Only)

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