Xilinx System Generator V2.1 Reference Manual page 56

Xilinx System Generator v2.1 Reference Guide
Figure 3-34: Forney convolutional interleaver with a constant difference
between consecutive branches
When the block is in deinterleaver mode, the input data sampled on the DIN port is
multiplexed into and out of
(synchronized) commutator arms. Branch 0 will have a shift register of length (
Branch (
Figure 3-35: Forney convolutional deinterleaver with a constant difference
between consecutive branches
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B shift registers onto the DOUT port using two
B
-1) shall have a shift register length of zero.
B L
-1)*
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.