Opencore plus time-out behavior, Interfaces & signals, Interface description – Altera QDRII SRAM Controller MegaCore Function User Manual

Page 42: Opencore plus time-out behavior” on

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.

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.

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