Altera Triple Speed Ethernet MegaCore Function Manual do Utilizador descarregar pdf (Página 171)

Timing Constraints

2014.06.30

UG-01008

Send Feedback

Altera provides timing constraint files (.sdc) to ensure that the Triple-Speed Ethernet MegaCore function

meets the design timing requirements in Altera devices. The files constraints the false paths and multi-cycle

paths in the Triple-Speed Ethernet Megacore function. The timing constraints files are specified in the

<variation_name>.qip file and is automatically included in the Quartus II project files.

You may need to add timing constraints that are external to the MegaCore function. The following sections

describe the procedure to create the timing constraint file.

Creating Clock Constraints

After you generate and integrate the Triple-Speed Ethernet MegaCore function into the system, you need

to create a timing constraints file to specify the clock constraint requirement.

You can specify the clock requirement in the timing constraint file using the following command:

create_clock

For example, for a new clock named "reg_clk", with a 50 MHz clock targeted to the top level input port

"clk", enter the following command line:

create_clock -name "reg_clk" -period "50 MHz" [get_ports "clk"]

Figure 9–1 shows an example of how you can create a timing constraint file to constrain the Triple-Speed

Ethernet MegaCore function clocks.

ISO

9001:2008

Registered

and logos are trademarks of Altera Corporation and registered in the U.S. Patent and Trademark Office and in other countries. All other

words and logos identified as trademarks or service marks are the property of their respective holders as described at

www.altera.com/common/legal.html. Altera warrants performance of its semiconductor products to current specifications in accordance with

Altera's standard warranty, but reserves the right to make changes to any products and services at any time without notice. Altera assumes

no responsibility or liability arising out of the application or use of any information, product, or service described herein except as expressly

agreed to in writing by Altera. Altera customers are advised to obtain the latest version of device specifications before relying on any published

information and before placing orders for products or services.

www.altera.com

101 Innovation Drive, San Jose, CA 95134

1 2 ... 166 167 168 169 170 171 172 173 174 175 176 ... 222 223

Sem comentários

Altera Triple Speed Ethernet MegaCore Function Manual do Utilizador Página 171