EP2C20F256C8N Datasheet, PDF (373/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

Configuring Cyclone II Devices
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Programming Serial Configuration Devices
Serial configuration devices are non-volatile, flash-memory-based
devices. You can program these devices in-system using the
USB-Blaster™ or ByteBlaster™ II download cable. Alternatively, you can
program them using the Altera Programming Unit (APU), supported
third-party programmers, or a microprocessor with the SRunner
software driver.
You can use the AS programming interface to program serial
configuration devices in-system. During in-system programming, the
download cable disables FPGA access to the AS interface by driving the
nCE pin high. Cyclone II devices are also held in reset by pulling the
nCONFIG signal low. After programming is complete, the download
cable releases the nCE and nCONFIG signals, allowing the pull-down and
pull-up resistor to drive GND and V_CC, respectively. Figure 13–7 shows
the download cable connections to the serial configuration device.
For more information on the USB-Blaster download cable, see the
USB-Blaster USB Port Download Cable Data Sheet. For more information
on the ByteBlaster II cable, see the ByteBlaster II Download Cable Data
Sheet.
Altera Corporation
February 2007
13–19
Cyclone II Device Handbook, Volume 1