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Interleaver/De-Interleaver

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Overview

IPexpress User Configurable LogoInterleaving is a technique commonly used in communication systems to overcome correlated channel noise such as burst error or fading. The interleaver rearranges input data such that consecutive data are spaced apart. At the receiver end, the interleaved data is arranged back into the original sequence by the de-interleaver. As a result of interleaving, correlated noise introduced in the transmission channel appears to be statistically independent at the receiver and thus allows better error correction.

Interleaver, De-interleaver

The Lattice Interleaver/de-interleaver IP core supports rectangular block type and convolutional architectures. Rectangular interleaving arranges the input data row-wise in a matrix. The interleaved data is obtained by reading the columns of the matrix. Convolutional interleaving feeds the input data to a number of branches, each of which has a shift register with pre-defined length. The output data is taken from the branch outputs. Lattice’s Convolutional Interleaver/de-interleaver IP Cores are compliant with ATSC and DVB standards, while the Rectangular Interleaver/de-interleaver is compliant with IEEE 802.16a standard.

 

Features

  • High performance and area efficient symbol interleaver/de-interleaver
  • Supports multiple standards, such as DVB, ATSC and IEEE 802.16
  • Convolutional and rectangular block type architectures available
  • Fully synchronous design using a single clock
  • Symbol size from 1 to 256 bits
  • Full handshake capability for input and output interfaces
  • Rectangular block type features
    • Variable block size
    • Variable number of rows
    • Variable number of columns
    • Row permutations
    • Column permutations
  • Convolutional type features
    • User-configurable number of branches
    • User-configurable branch length

 

Performance and Resource Utilization

Results for LatticeECP31
Mode SLICEs LUTs Registers I/Os sysMEM EBRs fMAX (MHz)
Convolutional Interleaver DVB 86 122 159 23 1 336
Convolutional De-Interleaver DVB 89 133 164 23 1 340
Rectangular Interleaver 802.16 54 64 101 24 2 340
Rectangular De-Interleaver 802.16 72 82 132 24 2 338

1. Performance and utilization data are generated using an LFE3-95E-8FN672CES device with Lattice’s Diamond 1.0 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP3 family.

Results for LatticeECP2M1
Mode SLICEs LUTs Registers I/Os sysMEM EBRs fMAX (MHz)
Convolutional Interleaver DVB 86 121 759 23 1 329
Convolutional De-Interleaver DVB 88 132 164 23 1 370
Rectangular Interleaver 802.16 52 75 101 24 2 353
Rectangular De-Interleaver 802.16 70 103 132 24 2 370

1. Performance and utilization data are generated using an LFE2M35E-7F484C device with Lattice’s. Diamond 1.0 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP2M family.

Results for LatticeECP21
Mode SLICEs LUTs Registers I/Os sysMEM EBRs fMAX (MHz)
Convolutional Interleaver DVB 86 121 759 23 1 357
Convolutional De-Interleaver DVB 88 132 164 23 1 370
Rectangular Interleaver 802.16 52 75 101 24 2 370
Rectangular De-Interleaver 802.16 70 103 132 24 2 370

1. Performance and utilization data are generated using an LFE2-50E-7F672C device with Lattice’s Diamond 1.0 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP2 family.

Results for LatticeEC/P1
Mode SLICEs LUTs Registers I/Os sysMEM EBRs fMAX (MHz)
Convolutional Interleaver DVB 92 128 159 23 1 267
Convolutional De-Interleaver DVB 95 140 164 23 1 235
Rectangular Interleaver 802.16 61 81 101 24 2 258
Rectangular De-Interleaver 802.16 81 94 132 24 2 230

1. Performance and utilization data are generated using an LFECP20E-5F672C device with Lattice’s Diamond 1.0 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP/EC family.

Results for LatticeSC/M1
Mode SLICEs LUTs Registers I/Os sysMEM EBRs fMAX (MHz)
Convolutional Interleaver DVB 107 139 159 23 1 375
Convolutional De-Interleaver DVB 110 154 164 23 1 375
Rectangular Interleaver 802.16 56 84 101 24 2 375
Rectangular De-Interleaver 802.16 77 117 132 24 2 375

1. Performance and utilization data are generated using an LFSC3GA25E-7F900C device with Lattice’s Diamond 1.0 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeSC/M families.

Results for LatticeXP21
Mode SLICEs LUTs Registers I/Os sysMEM EBRs fMAX (MHz)
Convolutional Interleaver DVB 86 121 159 23 1 314
Convolutional De-Interleaver DVB 88 132 164 23 1 299
Rectangular Interleaver 802.16 52 75 101 24 2 314
Rectangular De-Interleaver 802.16 70 103 132 24 2 314

1. Performance and utilization data are generated using an LFXP2-30E-7F484C device with Lattice’s Diamond 1.0 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeXP2 family.

Results for LatticeXP1
Mode SLICEs LUTs Registers I/Os sysMEM EBRs fMAX (MHz)
Convolutional Interleaver DVB 92 128 159 23 1 211
Convolutional De-Interleaver DVB 95 140 164 23 1 194
Rectangular Interleaver 802.16 61 81 101 24 2 191
Rectangular De-Interleaver 802.16 81 94 132 24 2 233

1. Performance and utilization data are generated using an LFXP20E-5F484C device with Lattice’s Diamond 1.0 software. Performance may
vary when using a different software version or targeting a different device density or speed grade within the LatticeXP family.

 

Ordering Information

Family
 OPN
LatticeECP3 INTV-DINT-E3-U3
LatticeECP2M INTV-DINT-PM-U3
LatticeECP2 INTV-DINT-P2-U3
LatticeEC/P INTV-DINT-E2-U3
LatticeSC INTV-DINT-SC-U3
LatticeXP2 INTV-DINT-X2-U3
LatticeXP INTV-DINT-XM-U3


IP Version: 3.4
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