Altera Reed-Solomon Compiler Manuel d'utilisateur télécharger pdf (Page 28)

3–10 Chapter 3: Functional Description

Throughput Calculator

Reed-Solomon Compiler December 2014 Altera Corporation

User Guide

Table 3–7 shows the configuration signals.

Table 3–8 shows the status signals (decoder only).

Throughput Calculator

The IP Toolbench throughput calculator (decoder only) uses the following equation:

Throughput in megasymbols per second = N × frequency (MHz)/N

For Mbps, multiply by m, the number of bits per symbol.

rsout data

Output

The

rsout

signal contains decoded output when source_val is asserted. The

corrected symbols are in the same order that they were entered.

rserr data

Output

Error correction value (decoder only, optional). Refer to “Error Symbol Output” on

page 3–5.

Table 3–6. Avalon-ST Source Interface (Part 2 of 2)

Name

Avalon-ST

Type

Direction Description

Table 3–7. Configuration Signals

Name Description

bypass

A one-bit signal that sets if the codewords are bypassed or not (decoder only). The decoder continuously

samples

bypass

numcheck

Sets the variable number of check symbols up to a maximum value set by the parameter R (variable option

only). The decoder samples

numcheck

only when

sink_sop

is asserted.

numn

Variable value of N. Can be any value from the minimum allowable value of N up to the selected value of N

(variable and erasures-supporting option only). The decoder samples

numn

only when

sink_sop

asserted.

Table 3–8. Status Signals

Name Description

decfail

Indicates non-correctable codeword. Valid when

source_sop

is asserted. Avalon-ST type

err

num_err_sym

Number of symbols errors. Valid when

source_sop

is asserted; invalid when

decfail

is asserted.

num_err_bit

Number of bits errors corrected in the codeword. Valid when

source_sop

is asserted; invalid when

decfail

is asserted. Connected only when the Bit error (Full count) option is turned on. Refer to “RS

Decoder” on page 3–4.

num_err_bit0

Number of bit errors for the corrections from bit 1 to bit 0. The latest is the correct bit. Valid when

sop_source

is asserted; invalid when

decfail

is asserted. The decoder presents these values at the

source_sop

assertion (at the next codeword). Connected only when the Bit error (Split count)

option is turned on.

num_err_bit1

Number of bit errors for the corrections from bit 0 to bit 1. The latest is the correct bit. Valid when

sop_source

is asserted; invalid when

decfail

is asserted. The decoder presents these values at the

source_sop

assertion (at the next codeword). Connected only when the Bit error (Split count)

option is turned on.

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Altera Reed-Solomon Compiler Manuel d'utilisateur Page 28

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