Lattice Semiconductor
Parameter Settings
GP0, GP1, GP2, GP3, GP4, GP5, GP6
Generator polynomials used for generating the convolutional code. Two polynomials are always used for punctured
decoders (either fixed or dynamic). For non-punctured decoders, the number of polynomials used is equal to n,
where n is denominator of the Code Rate (k/n).The width of each polynomial is equal to constraint length, K.
Implementation Method
The implementation method can be either “parallel” or “hybrid”. In the parallel implementation, the decoder can pro-
duce one output data in one cycle. In hybrid implementations, it takes multiple clock cycles to generate each output
data, but a smaller number of device resources are used.
Hybrid Index
This controls the resource-throughput trade-off in hybrid implementations. It takes 2 Hybrid Index cycles to produce one
output data.
Inputs
Decoder Input
Specifies whether the decoder is fed with a hard decision or soft decision input. For punctured decoders, this option
is not available and decoder has to be fed with soft decision inputs.
Soft Width
Input data width for soft decision inputs.
Data Type
Specifies whether the input data type is represented in sign-magnitude form (signed) or unsigned offset form
(unsigned). See the section “configuring the Block Viterbi Decoder” for details.
BER (Bit Error Rate)
BER Monitor
Specifies whether the optional bit error rate (BER) monitor is added to the Viterbi decoder.
BER Period
This determines the duration for which the BER is accumulated. The BER value starts accumulating from zero for
up to 2^(BER Period) clock cycles. After this period, the accumulated value is placed on the BER output port. The
BER value is then reset and the monitor starts accumulating again.
IPUG32_02.7, June 2010
21
Block Viterbi Decoder User’s Guide
相关PDF资料
VTERB-DECO-XP-N1 IP CORE VITERBI DECODER XPGA
VTP110F POLYSWITCH PTC RESET 1.1A STRAP
VTP175LF POLYSWITCH PTC RESET 1.75A STRAP
VTP210GF POLYSWITCH PTC RESET 2.1A STRAP
VTP210SF POLYSWITCH PTC RESET 2.1A STRAP
W51-A121B1-10 CIRCUIT BREAKER THERM 10A ILLUM
W54-XC2A4B10-40 CIRCUIT BREAKER THERMAL 40AMP
WV-089047-10-9 LABEL ID PRODUCTS
相关代理商/技术参数
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