Altera QDRII SRAM Controller MegaCore Function Bedienungsanleitung PDF herunterladen (Seite 65)

Altera Corporation MegaCore Version 9.1 3–33

November 2009 QDRII SRAM Controller MegaCore Function User Guide

Functional Description

Project Settings

Table 3–15 shows the example settings.

Table 3–16 shows the variation path parameters.

Table 3–17 shows the pin prefixes parameter.

Table 3–15. Example Settings

Parameter Description

Automatically apply QDR

SRAM controller-specific

constraints to the

Quartus II project

When this option is turned on, the next time you compile, the Quartus II software

automatically runs the add constraints script. Turn off this option if you do not want

the script to run automatically.

Update the example

design file that

instantiates the QDRII

SRAM controller

variation

When this option is turned on, IP Toolbench parses and updates the example design

file. It only updates sections that are between the following markers:

<<START MEGAWIZARD INSERT <tagname>

<<END MEGAWIZARD INSERT <tagname>

If you edit the example design file, ensure that your changes are outside of the

markers or remove the markers. Once you remove the markers, you must keep the

file updated, because IP Toolbench can no longer update the file.

Update example design

system PLL

When this option is turned on, IP Toolbench automatically overwrites the PLL.Turn off

this option, if you do not want the wizard to overwrite the PLL. The first time you

create a custom variation, you must turn on Update example design system PLL.

Table 3–16. Variation Path Parameters

Parameter Description

Enable hierarchy control The constraints script analyzes your design, to automatically extract the hierarchy to

your variation. To prevent the constraints script analyzing your design, turn on

Enable hierarchy control, and enter the correct hierarchy path to your controller.

Hierarchy path to

variation

The hierarchy path is the path to your QDRII SRAM controller, minus the top-level

name. The hierarchy entered in the wizard must match your design, because the

constraints scripts rely on this path for correct operation.

Table 3–17. Pin Prefixes

Parameter Description

Prefix all QDRII SRAM

pins with

This string prefixes the pin names for the FPGA pins that are connected to the QDRII

SRAM controller.

1 2 ... 60 61 62 63 64 65 66 67 68

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