Altera Cyclone IV - Combining JTAG and as Configuration Schemes

Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices 8–53
Configuration
May 2013 Altera Corporation Cyclone IV Device Handbook,
Volume 1
1 The .rbf used by the JRunner software driver cannot be a compressed .rbf because the
JRunner software driver uses JTAG-based configuration. During JTAG-based
configuration, the real-time decompression feature is not available.
f For more information about the JRunner software driver, refer to AN 414: JRunner
Software Driver: An Embedded Solution for PLD JTAG Configuration and the source files
on the Altera website at (www.altera.com).
Combining JTAG and AS Configuration Schemes
You can combine the AS configuration scheme with the JTAG-based configuration
(Figure 8–28). This setup uses two 10-pin download cable headers on the board. One
download cable is used in JTAG mode to configure the Cyclone IV device directly
through the JTAG interface. The other download cable is used in AS mode to program
the serial configuration device in-system through the AS programming interface. If
you try configuring the device using both schemes simultaneously, JTAG
configuration takes precedence and AS configuration terminates.