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Communication 57
Xilinx Blocks
When the branch lengths are specified as an array, the block operates the same in
either interleaver or deinterleaver mode because the array fully defines the length of
all the branches. The array must have length B, matching the number of branches.
The reset pin (rst) will set the commutator arms to branch 0, but will not clear the
branches of data.
Block Interface
The Interleaver/Deinterleaver block has two input and one output ports. The input
port, din, must be between 1 and 256 (inclusive) bits. The reset port, rst, must be of
type UFix1_0. The size of the output port, dout, is the same as the input port, din.
Block Parameters Dialog Box
Figure 3-36: Interleaver/Deinterleaver block parameters dialog box
Parameters specific to the block are:
• Mode: Interleaver or Deinterleaver
• Number of Branches: 1 to 256 (inclusive)
• Length of Branches: 1 to MAX (inclusive). MAX depends on the number of
branches and size of core input. Branch length must be an array of either length
one or number of branches. If the array size is one, the value is used as a constant
difference between consecutive branches. Otherwise, each branch has a unique
length.
• Memory Type: Automatically chosen, block RAM or distributed RAM
Other parameters used by this block are described in the Common Parameters section
of the previous chapter.
Xilinx LogiCORE
The block always uses the Xilinx LogiCORE: Interleaver/Deinterleaver v1.1.