A specialized multiplier block in a programmable logic device incorporates multipliers and adders, and is configurable as one or more types of finite impulse response filter including a Direct Form II FIR filter. For example, the motion vector of the current image block may be equal to the motion vector of the image block if the reference picture index indicates a long-term reference picture for the image block. Besides, in an active type EL display device, each pixel is constructed of one transistor and an EL element.