Altera Reed-Solomon Compiler Manual de usuario descargar pdf (Pagina 24)

3–6 Chapter 3: Functional Description

Interfaces

Reed-Solomon Compiler December 2014 Altera Corporation

User Guide

Figure 3–5 on page 3–6 shows the error symbol output.

Whenever

rserr

is not 0 (while

decfail

is 0), an error correction successfully takes

place. The

rsout

is the

rserr

XOR

ed with the corresponding

rsin

, where

XOR

is done

for each bit, so you know that the respective symbol has been corrected. The value of

rserr

shows which bits of the symbol have been corrected. For each bit of

rserr

that

is 1, the corresponding bit of

rsout

is corrected.

The

rsout

and the corresponding

rserr

value appear at the output at the same clock

cycle.

Bit Error Count

The decoder can provide the bit error count found in the correction process. The bit

error count has the following options:

■ Full count. The output

num_err_bit

is connected, which shows the valid value.

■ Split count. The outputs

num_err_bit0

and

num_err_bit1

are connected, which

show the valid values

For information about these outputs, refer to Table 3–8 on page 3–10.

Interfaces

The RS encoder and decoder use the Avalon

Streaming (Avalon-ST) interface for data

input and output. The input is an Avalon-ST sink and the output is an Avalon-ST

source. The Avalon-ST interface

READY_LATENCY

parameter is set to 1. The Avalon-ST

interfaces allow for flow control.

The Avalon-ST interface is an evolution of the Atlantic

™

interface. The Avalon-ST

interface defines a standard, flexible, and modular protocol for data transfers from a

source interface to a sink interface and simplifies the process of controlling the flow of

data in a datapath. The Avalon-ST interface signals can describe traditional streaming

interfaces supporting a single stream of data without knowledge of channels or

packet boundaries. Such interfaces typically contain data, ready, and valid signals.

The Avalon-ST interface can also support more complex protocols for burst and

packet transfers with packets interleaved across multiple channels. The Avalon-ST

interface inherently synchronizes multi-channel designs, which allows you to achieve

efficient, time-multiplexed implementations without having to implement complex

control logic.

Figure 3–5. Error Symbol Output

Memory

& Control

Syndrome

Calculation

rsin rserr

rsout

Solve Key

Equation

Chien Search

& Forney's

Algorithm

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 35 36

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