This is high-speed Reed-Solomon encoder/decoder core, which is widely used in the error correction of various storage and communication systems.
Introduction
Four kinds of products are selectable to meet different demands.
| Product No | Erasure | External RAM |
|---|---|---|
| Si2520 | No | No |
| Si2520-E | Yes | No |
| Si2520-M | No | Yes |
| Si2520-EM | Yes | Yes |
Features
・High-speed encoding/decoding
・Support shortened codes
・Number of bits per symbol (m) : 3 to 12 bits
・Number of symbols in a codeword (n) : 3 to 2m-1 symbols
・Number of information symbols (k) : 1 to 2m-3 symbols
・Number of correctable symbols (t) : 1 to 2m-1-1 symbols
・Primitive polynomial configurable
・Support erasure correction
・No external RAM option
・Available limitation of number of correctable symbols
・Support continuous encoding / decoding due to pipeline
(except the case of n<4t+2)
・Fully synchronous design using a single clock
・ASIC friendly design
Deliverables
・Verilog RTL source code
・FPGA netlist (Xilinx, Altera, Lattice, etc.)
・ASIC netlist (need ASIC cell library)
・CPU/DSP source code (C, Assembler)
Especially we've got high experience on TI's DSP.
Test bench and test patterns are also provided.
Gate Count / Performance
・TSMC 90nm
(Constraints : Clock skew 20%, Using wire load model)
#1: Si2520 (m=4, n=15, k=11, t=2)
#2: Si2520 (m=8, n=20, k=16, t=2)
#3: Si2520-M (m=8, n=255, k=239, t=8)
#4: Si2520-EM (m=8, n=204, k=188, t=8)
Interface
Encoder
Input
| Name | Description |
|---|---|
| ICLK | Clock |
| IXRST | Asynchronous reset |
| IDATA[m-1:0] | Information symbol |
| IDEN | Information symbol enable |
Output
| Name | Description |
|---|---|
| ORDY | Ready to input information symbol |
| ODATA[m-1:0] | Code symbol |
| ODEN | Code symbol enable |
Decoder
Input
| Name | Description |
|---|---|
| ICLK | Clock |
| IXRST | Asynchronous reset |
| IDATA[m-1:0] | Code symbol |
| IDEN | Code symbol enable |
| IERS | Erasure position (*1) |
| ILMT[h-1:0] | Correctable symbol limitation (*3) |
| IRAMRD[m-1:0] | External RAM read data (*2) |
*1 : Only for Si2520-E, Si2520-EM
*2 : Only for Si2520-M, Si2520-EM
*3 : Only when limitation of number of correctable symbols is used
Output
| Name | Description |
|---|---|
| ORDY | Ready to input code symbol |
| ODATA[m-1:0] | Decoded symbol |
| ODEN | Decoded symbol enable |
| OFAIL | Decoding fail flag |
| OERRNUM[h-1:0] | Number of corrected symbols |
| OEND | Decoding end flag |
| ORAMWA[a-1:0] | External RAM write address (*2) |
| ORAMWE | External RAM write enable (*2) |
| ORAMWD[m-1:0] | External RAM write data (*2) |
| ORAMRA[a-1:0] | External RAM read address (*2) |
| ORAMRE | External RAM read enable (*2) |
Applications
- Communications (support various standards with RS code)
- Hard disk drive(HDD), Optical disc drive(ODD), Solid state drive(SSD)
For more information/customization on Reed-Solomon encoder/decoder, please contact us.
* The content might change without a previous notice due to the improvement.