Altera QDRII SRAM Controller MegaCore Function Manuel d'utilisateur télécharger pdf (Page 42)

3–10 MegaCore Version 9.1 Altera Corporation

QDRII SRAM Controller MegaCore Function User Guide November 2009

OpenCore Plus Time-Out Behavior

Figure 3–6. Timing Diagram of the IOE

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 refer to 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 time out is 1 hour; the

tethered time out value is indefinite.

Your design stops working after the hardware evaluation time expires,

the reads and writes go low, and the wait output goes high.

f For more information on OpenCore Plus hardware evaluation, refer to

“OpenCore Plus Evaluation” on page 1–3 and AN 320: OpenCore Plus

Evaluation of Megafunctions.

Interfaces &

Signals

This section describes the following topics:

■ “Interface Description” on page 3–10

■ “Signals” on page 3–22

Interface Description

This section describes the following Avalon

interface requests:

cqn

I/O A[7:0]

Expected B[7:0]

Real B[7:0]

Usable

part of B[7:0]

Delayed cq

00 01 02 0303

00 01 02 0302

01 02 0303

00 01 02 0303

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 67 68

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