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Chapter 3: Functional Description 3–5
RS Decoder
December 2014 Altera Corporation Reed-Solomon Compiler
User Guide
The RS decoder observes Avalon-ST interface standard for input and output data. One
clock cycle after the decoder asserts
sink_ena
, you can assert
sink_val
. The decoder
accepts the data at
rsin
as valid data. The codeword is started with
sink_sop
. The
numcheck
and
numn
signals are latched to
sink_sop
.
The codeword is finished when
sink_eop
is asserted. If
sink_ena
is de-asserted, from
one clock cycle onwards the decoder cannot process any more data until
sink_ena
is
asserted again.
At the output the operation is identical. If you assert
source_ena
, the decoder asserts
source_val
and provides valid data on
rsout
if available. Also, it indicates the start
and end of the codeword with
source_sop
and
source_eop
respectively.
Figure 3–4 shows the operation of the RS decoder.
The decoder has the following optional outputs, which you turn on in IP Toolbench:
■ Error symbol
■ Bit error count
Error Symbol Output
The error symbol output,
rserr
is the Galois field error correction value. The RS
decoder finds the error values and location and adds these values in the Galois field to
the input value. Galois field addition and subtraction is the same operation. An
XOR
operation performs this operation between bits of the two values.
Figure 3–4. Decoder Timing
clk
sink_ena
sink_val
sink_sop
sink_eop
rsin[8:1]
source_ena
source_val
source_sop
source_eop
rsout[8:1]
numcheck[4:1]
numn[4:1]
01 02 03 04 05 06 07 08
P1 P2
P3
P4
P5 09 10 11 12 13
01 02 03 04 05 06 07 08
P1
P2 P3 P4
P5
12
05 05
13 13
- User Guide 1
- Reed-Solomon Compiler 1
- Contents 3
- 1. About This Compiler 5
- Release Information 6
- Device Family Support 6
- (EP4SGX70DF29C2X) devices 7
- 2. Getting Started 9
- Simulating IP Cores 13
- Changes search path order 14
- Upgrading Outdated IP Cores 15
- DSP Builder Design Flow 16
- 3. Functional Description 19
- Erasures 20
- Shortened Codewords 20
- RS Encoder 21
- RS Decoder 22
- Error Symbol Output 23
- Interfaces 24
- Parameters 25
- Notes to Table 3–3: 26
- Throughput Calculator 28
- CCSDS System 31
- Supplying Test Patterns 32
- Additional Information 33
- How to Contact Altera 34
- Typographic Conventions 34
- Additional Information Info–3 35
- Info–4 Additional Information 36
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