This FIR Filter Generator takes a set of coefficients of any desired length and type and generates an FIR filter with a ValidWithSync interface for input/output streams. This version generates an FIR filter with constant coefficients as it is only intended as a Low Pass/Band Pass filter generator with constant corner frequencies.
trait FIRFilterParams[T <: Data] {
val protoData: T
val taps: Seq[T]
}
tapscorresponds to the coefficients of the FIR filter, expressed in terms of the input data type. The number of multiplication units is inferred from the given sequence.
The generated FIR Filter has one input and one output port. Both of these are standard ValidWithSync interfaces. Internally, valid is used to enable the shift register chain, and is also propagated through the block to preserve data validity information. sync pin is not internally used but is propagated to provide syncronization information for later blocks.