EP2C20F256C8N Datasheet, PDF (404/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

PS Configuration
In addition, because the nSTATUS pins are connected, all the Cyclone II
devices in the chain stop configuration if any device detects an error. If
this happens, you must manually restart configuration in the Quartus II
software.
Figure 13–20 shows how to configure multiple Cyclone II devices with a
download cable.
13–50
Cyclone II Device Handbook, Volume 1
Altera Corporation
February 2007