Altera Dynamic Calibrated On-Chip Termination User Manual
Page 10
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
page, expand the Using
Megafunctions
section and then expand the I/O section.
■
On the
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.