EP2C5T144I8N Datasheet, PDF (425/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

Configuring Cyclone II Devices
frequency (up to 40 MHz), which reduces your configuration time. In
addition, Cyclone II devices can receive a compressed configuration
bitstream and decompress this data on-the-fly in the AS or PS
configuration scheme, which further reduces storage requirements and
configuration time.
Altera Corporation
February 2007
13–71
Cyclone II Device Handbook, Volume 1