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Block Viterbi Decoder

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Overview

The Block Viterbi Decoder IP core is a parameterizable core for decoding different combinations of convolutionally encoded sequences. The decoder core supports various code rates, constraint lengths and generator polynomials. It also allows soft-decision decoding and is capable of decoding punctured codes. The core can operate in continuous or block mode, whichever is required by the channel. Either tail-biting or zero-flushing convolutional codes can be decoded in the block mode. All the configurable parameters, including operation mode, generator polynomials, puncturing block size and puncturing pattern can be defined by the user to suit the needs of their application. The architectural details of the core are given in the next section. Lattice’s Block Viterbi Decoder IP is compatible with many networking and wireless standards that use convolutional encoding at the encoder and Viterbi decoding at the decoder.

Features

Compatible with the following standards: IEEE 802.16-2004 SC PHY/ OFDM PHY, IEEEE802.11a, 3GPP, 3GPP2, and DVB-S
Supports multiple code rates: 1/2, 1/3, ... 1/7 for non-punctured codes, 2/3, 3/4, ..., 12/13 for punctured codes, and from m/(m+1) to m/(2m-1), where m is from 1 to 12, for dynamic punctured codes
Variable constraint length from 3 to 9
Supports dynamically variable code rates and puncture patterns
Dynamic BER estimation option
One-clock synchronous design
Hard or parameterizable soft decision decoding. Hard and soft decision for non-punctured codes and soft decision for punctured codes
Fully parallel or hybrid implementations. For a hybrid implementation, the degree of parallelism is parameterizable
Parameterizable trace-back length
Signed and unsigned representations for soft decision data
Supports parameterized puncturing patterns
Supports both continuous and block data input
Supports both Tail Biting and Zero Flushing block convolutional codes
Supports both one and two traceback schemes to cater to different coding scenarios

Performance and Resource Utilization

Results for LatticeECP/EC¹
Parameter File	Parameters	SLICEs	LUTs	Registers	IOB	sysMEM EBRs	f_MAX(MHz)
IEEE 802.16a 2004-SC PHY	See User's Guide	272	447	232	11	2	115
3GPP	See User's Guide	5314	9898	3680	13	16	90
DVB-S, IEEE 802.11a	See User's Guide	1358	2556	963	10	4	105
IEEE 802.16 2004-OFDM PHY (dynamic puncturing)	See User's Guide	1547	2801	1069	29	4	100
IEEE 802.16 2004-OFDM PHY (fixed puncturing)	See User's Guide	1800	3296	1223	13	4	100

¹Performance and utilization characteristics are generated using LFECP20E-5F672C, with Lattice's ispLEVER v7.0 SP2 software. When using this IP core in a different density, speed, or grade within the LatticeEC family, performance may vary.

Results for LatticeECP2¹
Parameter File	Parameters	SLICEs	LUTs	Registers	IOB	sysMEM EBRs	f_MAX(MHz)
IEEE 802.16a 2004-SC PHY	See User's Guide	288	463	232	11	2	170
3GPP	See User's Guide	6341	11467	3640	13	16	120
DVB-S, IEEE 802.11a	See User's Guide	1613	29532	937	10	4	155
IEEE 802.16 2004-OFDM PHY (dynamic puncturing)	See User's Guide	1878	3261	1074	29	4	150
IEEE 802.16 2004-OFDM PHY (fixed puncturing)	See User's Guide	1993	3511	1225	13	4	140

¹ Performance and utilization characteristics are generated using LFE2-50E-7F484C, with Lattice's ispLEVER v7.0 SP2 software. When using this IP core in a different density, speed, or grade within the LatticeECP2 family, performance may vary.

Results for LatticeECP2M¹
Parameter File	Parameters	SLICEs	LUTs	Registers	IOB	sysMEM EBRs	f_MAX(MHz)
IEEE 802.16a 2004-SC PHY	See User's Guide	257	428	232	11	2	185
3GPP	See User's Guide	5040	9418	3637	13	16	115
DVB-S, IEEE 802.11a	See User's Guide	1265	2432	923	10	4	145
IEEE 802.16 2004-OFDM PHY (dynamic puncturing)	See User's Guide	1477	2683	1092	29	4	145
IEEE 802.16 2004-OFDM PHY (fixed puncturing)	See User's Guide	1809	3248	1245	13	4	140

¹ Performance and utilization characteristics are generated using LFE2M-35E-7F672C, with Lattice's ispLEVER v7.0 SP2 software. When using this IP core in a different density, speed, or grade within the LatticeECP2M family, performance may vary.

Results for LatticeSC¹
Parameter File	Parameters	SLICEs	LUTs	Registers	IOB	sysMEM EBRs	f_MAX(MHz)
IEEE 802.16a 2004-SC PHY	See User's Guide	257	428	232	11	2	250
3GPP	See User's Guide	5040	9418	3637	13	16	195
DVB-S, IEEE 802.11a	See User's Guide	1265	2432	923	10	4	220
IEEE 802.16 2004-OFDM PHY (dynamic puncturing)	See User's Guide	1477	2683	1092	29	4	215
IEEE 802.16 2004-OFDM PHY (fixed puncturing)	See User's Guide	1809	3248	1245	13	4	200

¹ Performance and utilization characteristics are generated using LFSC3GA25E-7F900C, with Lattice's ispLEVER v7.0 SP2 software. When using this IP core in a different density, speed, or grade within the LatticeSC family, performance may vary.

Results for LatticeXP¹
Parameter File	Parameters	SLICEs	LUTs	Registers	IOB	sysMEM EBRs	f_MAX(MHz)
IEEE 802.16a 2004-SC PHY	See User's Guide	272	447	232	11	2	110
3GPP	See User's Guide	5314	9898	3680	13	16	85
DVB-S, IEEE 802.11a	See User's Guide	1358	2556	963	10	4	90
IEEE 802.16 2004-OFDM PHY (dynamic puncturing)	See User's Guide	1547	2801	1069	29	4	90
IEEE 802.16 2004-OFDM PHY (fixed puncturing)	See User's Guide	1800	3296	1223	13	4	90

Results for LatticeXP2¹
Parameter File	Parameters	SLICEs	LUTs	Registers	IOB	sysMEM EBRs	f_MAX(MHz)
IEEE 802.16a 2004-SC PHY	See User's Guide	288	463	232	11	2	130
3GPP²	See User's Guide	n/a	n/a	n/a	n/a	n/a	n/a
DVB-S, IEEE 802.11a	See User's Guide	1613	2953	937	10	4	115
IEEE 802.16 2004-OFDM PHY (dynamic puncturing)	See User's Guide	1878	3261	1074	29	4	120
IEEE 802.16 2004-OFDM PHY (fixed puncturing)	See User's Guide	1993	3511	1225	13	4	110

¹ Performance and utilization characteristics are generated using LFXP20E-5F256C, with Lattice's ispLEVER v7.0 SP2 software. When using this IP core in a different density, speed, or grade within the LatticeXP family, performance may vary.
² There are not enough sysMEM EBRs to support this mode; follow-on XP2 devices have sufficient EBRs to support this mode.

Ordering Information

Part Numbers:
For LatticeECP/EC: VTERB-BLK-E2-U4
For LatticeECP2: VTERB-BLK-P2-U4
For LatticeECP2M: VTERB-BLK-PM-U4
For LatticeSC: VTERB-BLK-SC-U4
For LatticeXP: VTERB-BLK-XM-U4
For LatticeXP2: VTERB-BLK-X2-U4

To find out how to purchase the Block Viterbi Decoder IP Core, please contact your local Lattice Sales Office.

For information about evaluating or purchasing the Block Viterbi Decoder IP core for the LatticeXP2 family, please contact your local Lattice Sales Office.

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