Altera Reed-Solomon Compiler Manual de usuario descargar pdf (Pagina 26)

3–8 Chapter 3: Functional Description

Signals

Reed-Solomon Compiler December 2014 Altera Corporation

User Guide

Table 3–3 shows the RS codeword parameters.

Signals

Table 3–4 shows the global signals.

Table 3–3. RS Codeword Parameters

Parameter Range

Range

(Continuous)

Description

Number of bits per

symbol

3 to 12 6 to 12 Specifies the number of bits per symbol (m).

Number of symbols per

codeword

5 to (2

– 1) 7(R + 1) to 2

– 1

Specifies the total number of symbols per

codeword (N).

Number of check symbols

per codeword

2 to min(128, N – 1) 4 to N/7 – 1

Specifies the number of check symbols per

codeword (R)

Field polynomial Any valid polynomial

(1)

Specifies the primitive polynomial defining the

Galois field.

First root of generator

polynomial

0 to (2

– 2)

Specifies the first root of the generator polynomial

Root spacing in generator

polynomial

Any valid root space

(1)

Specifies the minimum distance between roots in

the generator polynomial (a).

Notes to Table 3–3:

(1) IP Toolbench allows you to select only legal values. For m > 8, not all legal values of the field polynomials and rootspace are present in IP

Toolbench. If you cannot find your intended field polynomial or rootspace in the IP Toolbench list, contact Altera MySupport.

Table 3–4. Global Signals

Name Description

clk clk

is the main system clock. The whole MegaCore function operates on the rising edge of

clk

reset

Reset. The entire decoder is asynchronously reset when reset is asserted high. The

reset

signal resets the

entire system. The

reset

signal must be de-asserted synchronously with respect to the rising edge of

clk

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 35 36

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