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Chapter 3: Functional Description 3–3

Design Example: Series Calibration for Four Calibration Blocks Using Stratix III Device

February 2012 Altera Corporation Dynamic Calibrated On-Chip Termination (ALTOCT) Megafunction

User Guide

■ Use a QSF assignment to indicate which pin (bus) is associated with which

calibration block.

f For more information about the OCT architecture and the calibration modes for other

device families, refer to the respective device handbooks.

Design Example: Series Calibration for Four Calibration Blocks Using

Stratix III Device

This design example uses the ALTOCT megafunction to calibrate four calibration

blocks using series termination for the Stratix III device. This example uses the

MegaWizard Plug-In Manager in the Quartus II software.

In this example, you perform the following tasks:

■ Generate the dynamic on-chip termination calibration blocks using the ALTOCT

megafunction in the MegaWizard Plug-In Manager

■ Ensure that correct termination assignments are used in the design by using the

Assignment Editor

■ Simulate the design in the ModelSim-Altera software

The design examples are available for download from the following locations:

■ On the Documentation: Quartus II Development Software page, expand the Using

Megafunctions section and then expand the I/O section.

■ On the Documentation: User Guides section of the Altera website.

Generate the Dynamic On-Chip Termination Calibration Blocks

Perform the following steps to generate the dynamic on-chip termination calibration

blocks:

1. Open altoct_DesignExample.zip and extract altoct_ex.qar.

2. In the Quartus II software, open altoct_ex.qar and restore the archive file into your

working directory.

3. Open the top-level file, altoct_ex.bdf.

4. Double-click on a blank area in the schematic.

5. In the Symbol window, click MegaWizard Plug-In Manager. Page 1 of the

MegaWizard Plug-In Manager appears.

6. Select Create a new custom megafunction variation.

7. Click Next. Page 2a of the MegaWizard Plug-In Manager appears.

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Altera Dynamic Calibrated On-Chip Termination Manuale Utente Pagina 10