EP2C20F256C8N Datasheet, PDF (397/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

Configuring Cyclone II Devices
If your design has multiple Cyclone II devices of the same density and
package that contain the same configuration data, connect the nCE inputs
to GND and leave the nCEO pins floating. You can also use the nCEO pin
as a user I/O pin. Connect the configuration device nCONFIG, nSTATUS,
DCLK, DATA0, and CONF_DONE pins to each Cyclone II device in the
chain. The configuration signals may require buffering to ensure signal
integrity and prevent clock skew problems. Make sure that the DCLK and
DATA lines are buffered for every fourth device. All devices start and
complete configuration at the same time. Figure 13–16 shows multiple
device PS configuration when the Cyclone II devices are receiving the
same configuration data.
Altera Corporation
February 2007
13–43
Cyclone II Device Handbook, Volume 1