Xilinx V2.1 - Manual (Page 79)

DSP 79
Xilinx Blocks
The Dual Port Block Memory LogiCORE datasheet can be found on your local disk at:
%XILINX%\coregen\ip\xilinx\eip1\com\xilinx\ip\blkmemdp_v3_2\do
c\dp_block_mem.pdf
FIR
The Xilinx FIR Filter Block implements a finite-impulse response (FIR)
digital filter, or a bank of identical FIR filters (multichannel mode). An
N-tap filter is defined by N filter coefficients (or taps) h(0), h(1), ....,h(n-
1). Here each h(i) is a Xilinx fixed point number.
The filter block accepts a stream of Xilinx fixed point data samples x(0),
x(1), ..., and at time n computes the output:
Block Interface
The FIR block takes one to eight inputs, x
i
(n) : i Xilinx Blockset signal fixed point
data samples.
The block produces the same number of output signals, y
i
(n) : i Xilinx Blockset fixed
point samples.
y n
( )
h i
( )
x n i –
( )
i 0 =
N 1 –
∑
=