Home > Products > Intellectual Property > Lattice IP Cores > Block Convolutional Encoder
Block Convolutional Encoder
Overview
Convolutional encoding is a process of adding redundancy to a signal strea m to
provide error correction capability. The figure below shows a digital communication
system using the Convolutional Encoder. The digital data stream (such as vo ice,
image or any packetized data) is first convolutionally encoded, then modulated and finally transmitted through a channel.
Lattice’s Block Convolutional Encoder IP core is a parameterizable core for convolutional encoding of continuous or
burst input data streams. The core allows different code rates and constraint lengths and supports puncturing. It can
operate in continuous or block mode, whichever is required by the channel. In block mode, either Zero Flushing or Tail
Biting codes can be generated. All the configurable parameters, including operation mode, termination mode, generator
polynomials, code rate, and puncture pattern, can be defined by the user to suit the needs of the application. The code
rate and the puncture pattern can also be varied through the input ports dynamically, providing further flexibility for the IP
usage. Lattice’s Block Convolutional Encoder IP core is compatible with many networking and wireless standards that use
convolutional encoding.
Features
Compatible with the following standards: IEEE 802.16-2004, IEEE 802.11a,
3GPP, 3GPP2 and DVB-S
Supports both continuous and block encoding
Variable constraint length from 3 to 9
Supports both Zero Flushing and Tail Biting termination modes
Supports both internal and external zero padding in Zero Flushing mode
Supports both internal and external tail adding in Tail Biting mode
Supports a wide range of programmable code rates (input_rate/output_rate)
User defined generator polynomials
Output puncturing with unrestricted, user programmable puncture pat tern s
Supports dynamic puncturing mode, in which both the code rate and
puncture patterns can be varied through ports
Punctured code rate can be programmed to k/n, where k can be from 2 to 12
and n can be from k+1 to 2k-1; additionally, rate 1/2 is supported in dynamic
puncture mode
Handshake signals to support breaks in data stream or encoder busy
conditions
Performance and Resource Utilization
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
Config 1 41 44 48 - 13 482
LatticeECP31
Pa
g
e 1 of 3Block Convolutional Encode
r
10/6/2011htt
p
://www.latticesemi.com/
p
roducts/intellectual
p
ro
p
ert
y
/i
p
cores/blockconvolutionalenco
d
...
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
Config 2 24 25 34 - 12 500
Config 3 9 6 16 - 7 500
Config 4 108 136 131 - 30 346
Config 5 40 45 53 - 8 435
1. Performance and utilization data are generated targeting an LFE3-95E-8FN672CES device using Lattice Diamond 1.0 and Synplify Pro
D-2009.12L -1 softw a re . Performance may vary when using a different software version or targeting a different device density or speed
grade within the LatticeECP3 family.
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
Config 1 45 44 48 - 13 466
Config 2 25 25 34 - 12 509
Config 3 9 6 16 - 7 883
Config 4 116 141 131 - 30 352
Config 5 43 45 53 - 8 504
LatticeECP2M1
1. Performance and utilization data are generated targeting an LFE2M/S35E-7F484C device using Lattice Diamond 1.0 and Synplify Pro D
-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed
grade within the LatticeECP2M family.
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
Config 1 44 42 48 - 13 404
Config 2 24 25 34 - 12 372
Config 3 9 6 16 - 7 563
Config 4 119 143 131 - 30 278
Config 5 43 46 53 - 8 397
LatticeECP21
1. Performance and utilization data are generated targeting an LFE2-50E-7F672C device using Lattice Diamond 1.0 and Synplify Pro D-
2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed
grade within the LatticeECP2/ECP2S family.
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
Config 1 44 44 48 - 13 404
Config 2 24 25 34 - 12 372
Config 3 9 6 16 - 7 563
Config 4 119 143 131 - 30 278
Config 5 43 46 53 - 8 397
LatticeECP/EC1
1. Performance and utilization data are generated targeting an LFEC/P20E-5F672C device using Lattice Diamond 1.0 and Synplify Pro D-
2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed
grade within the LatticeECP/EC family.
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
Config 1 41 42 48 - 13 400
LatticeSC1
Pa
g
e 2 of 3Block Convolutional Encode
r
10/6/2011htt
p
://www.latticesemi.com/
p
roducts/intellectual
p
ro
p
ert
y
/i
p
cores/blockconvolutionalenco
d
...
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
Config 2 24 24 34 - 12 400
Config 3 9 6 16 - 7 400
Config 4 115 146 131 - 30 392
Config 5 40 44 53 - 8 400
1. Performance and utilization data are generated targeting an LFSC/M3GA25E-7F900C device using Lattice Diamond 1.0 and Synplify
Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or
speed grade within the LatticeSC/SCM family.
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
Config 1 45 44 48 - 13 481
Config 2 25 25 34 - 12 491
Config 3 9 6 16 - 7 647
Config 4 116 141 131 - 30 298
Config 5 43 47 53 - 8 495
LatticeXP21
1. Performance and utilization data are generated targeting an LFXP2-17E-7F484C device using Lattice Diamond 1.0 and Synplify Pro D-
2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed
grade within the LatticeXP2 family.
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
Config 1 44 42 48 - 13 327
Config 2 24 25 34 - 12 361
Config 3 9 6 16 - 7 589
Config 4 115 127 131 - 30 250
Config 5 40 46 53 - 8 363
LatticeXP1
1. Performance and utilization data are generated targeting an LFXP20E-5F484C device using Lattice Diamond 1.0 and Synplify Pro D-
2009.12L-1 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 Part Numbers
LatticeECP3 CONV-BLK-E3-U3
LatticeECP2M CONV-BLK-PM-U3
LatticeECP2 CONV-BLK-P2-U3
LatticeECP/EC CONV-BLK-E2-U3
LatticeSC CONV-BLK-SC-U3
LatticeXP2 CONV-BLK-X2-U3
LatticeXP CONV-BLK-XM-U3
IP Version: 3.6
Evaluate: To download a full evaluation version of this IP, go to the IPexpress tool and click the IP Server button in the
toolbar. All LatticeCORE IP cores and modules available for download will be visible. For more information on
viewing/downloading IP please read the IP Expre ss Quick Start Guide.
Purchase: To find out how to purchase the IP Core, please contact your local Lattice Sales Office.
Pa
g
e 3 of 3Block Convolutional Encode
r
10/6/2011htt
p
://www.latticesemi.com/
p
roducts/intellectual
p
ro
p
ert
y
/i
p
cores/blockconvolutionalenco
d
...
