EP3C80 datasheet(175/274 Pages) ALTERA

175 / 274 page

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

9–17

Configuration Features

August 2012

Altera Corporation

Cyclone III Device Handbook

Volume 1

To configure four identical Cyclone III device family with the same .sof, you must set

up the chain similar to Figure 9–5. The first device is the master device and its MSEL

pins must be set to select the AS configuration. The other three slave devices are set

up for concurrent configuration and their MSEL pins must be set to select the PS

configuration. The nCEO pin from the master device drives the nCE input pins on all

three slave devices, as well as the DATA and DCLK pins that connect in parallel to all

four devices. During the first configuration cycle, the master device reads its

configuration data from the serial configuration device while holding nCEO high. After

completing its configuration cycle, the master device drives nCE low and sends the

second copy of the configuration data to all three slave devices, configuring them

simultaneously.

The advantage of using the setup in Figure 9–5 is that you can have a different .sof for

the master device. However, all the slave devices must be configured with the same

.sof

. In this configuration method, you can either compress or uncompress the .sofs.

EP3C80 Datasheet(PDF) 175 Page - Altera Corporation