Altera 8B10B Encoder/Decoder MegaCore Function Bedienungsanleitung PDF herunterladen (Seite 9)

Chapter 1: About This MegaCore Function 1–5

Installation and Licensing

May 2011 Altera Corporation 8B10B Encoder/Decoder MegaCore Function User Guide

OpenCore Plus Time-Out Behavior

OpenCore

Plus hardware evaluation can support the following two modes of

operation:

■ Untethered—the design runs for a limited time

■ Tethered—requires a connection between your board and the host computer. If

tethered mode is supported by all megafunctions in a design, the device can

operate for a longer time or indefinitely

All megafunctions in a device time out simultaneously when the most restrictive

evaluation time is reached. If there is more than one megafunction in a design, a

specific megafunction’s time-out behavior may be masked by the time-out behavior of

the other megafunctions.

1 For MegaCore functions, the untethered timeout is 1 hour; the tethered timeout value

is indefinite.

Your design stops working after the hardware evaluation time expires, and the

following events occur:

■ For the encoder:

■ The

ena

input signal is forced low (deasserted).

■ The

dataout

output is forced to the k28.5 pattern.

■ The

valid

output is forced low (deasserted).

■ For the decoder:

■ The

ena

input signal is forced low (deasserted).

■ The

dataout

output is forced to all zeros.

■ The

valid

output is forced low (deasserted).

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Altera 8B10B Encoder/Decoder MegaCore Function Bedienungsanleitung Seite 9