EP2S130F1020I4 Datasheet, PDF (623/768 Pages) List of Unclassifed Manufacturers – Stratix II Device Handbook, Volume 1

Configuring Stratix II and Stratix II GX Devices
If you are using a download cable to configure device(s) on a board that
also has configuration devices, electrically isolate the configuration
device from the target device(s) and cable. One way of isolating the
configuration device is to add logic, such as a multiplexer, that can select
between the configuration device and the cable. The multiplexer chip
allows bidirectional transfers on the nSTATUS and CONF_DONE signals.
Another option is to add switches to the five common signals (nCONFIG,
nSTATUS, DCLK, DATA0, and CONF_DONE) between the cable and the
configuration device. The last option is to remove the configuration
device from the board when configuring the device with the cable.
Figure 7–29 shows a combination of a configuration device and a
download cable to configure an device.
Altera Corporation
January 2008
7–71
Stratix II Device Handbook, Volume 2