Description DCLK and DATA0 are dedicated inputs that are used during configuration for Cyclone® devices. DATA[7:0] are dual purpose pins for Stratix® devices that can operate as a user defined pin in user mode depending on the dual purpose pin setting (device and pin options tab). So for a Stratix device, DCLK is a dedicated input and DATA[7:0] is a dual purpose pin. Once configuration is done and the Stratix and Cyclone device has entered into user mode, DCLK and DATA can be toggled without effecting the configuration data.
BUILT IN - ARTICLE INTRO SECOND COMPONENT