For example, for FR4 material common practice is to use 150 ps/inch. Convert the length of the trace to delay by using a lumped per inch number. Simple (not recommended): Measure the physical trace length (in mils or mm) in a layout tool. You simply need to enter the board trace delays for all the relevant traces and the tool will output all the Board Skew parameters that you need to enter during IP generation process. This tool is available on Altera web portal. Alternatively, you can you Board Skew Parameter Tool to calculate these parameters. The definitions of the these parameters are availaible in Vol 2 Chapter 9 of the EMIF Handbook.
![intel fpga simulation intel fpga simulation](https://www.cmc.ca/wp-content/uploads/2020/10/CQSG-0077_Fig1.png)
In this section you can input board length and length matching related information that represents your hardware through various parameters. Filling out Board Timing Board and Package Skews Quartus will close the system level timing for you once you have entered accurate Memory Timing and Board timing information in the IP.
#INTEL FPGA SIMULATION SOFTWARE#
Use simulation software to obtain channel loss and board skew data.
![intel fpga simulation intel fpga simulation](https://miro.medium.com/max/1400/1*7Qo180APTfleI1JBBnW62A.png)
Note: Please do not use any simulation tool to perform system-level timing closure. The next section describes Altera’s guidance on providing information in the ‘Board Timing’ tab. To get an accurate sense of ‘Board Timing’ you need to fill up the ‘Board Timing’ section in the Arria 10 external memory interface IP. Accurate memory timing-related information can be obtained from memory datasheet. However, to get accurate sense of the timing, you need to provide accurate information about the DRAM and your PCB through ‘Memory Timing’ and ‘Board Timing’ tab. System-level timing closureĮxternal memory interface IP provided by Altera will close timing on the entire interface. Repeat this step until you see positive timing margins. Recalculate accurate ‘Channel Signal Integrity’, ‘Setup and Hold Derating’ and ‘Board Skew’ parameters. If you see non-core timing violations, then you need to change your layout accordingly to make improvements on trace length mismatch or ISI or crosstalk. Generate the Memory Interface IP and run a Quartus compilation. Once you obtain fairly accurate Board Timing numbers, enter these numbers in the Memory Interface IP.
#INTEL FPGA SIMULATION HOW TO#
The later part of the section explains how to calculate the Channel Board Timing Parameters with a board simulation example. When you have the first draft of your memory interface layout, Altera recommends that you perform post-layout board-level simulation to calculate various Board Timing parameters. Once you have initial estimation of ‘Board Timing parameters follow the flow mentioned in the next topic to get a sign off on the layout.ĭetailed pre-layout simulation guidelines can be found here: DDR4_simulation_guidelines Arria 10 Recommended Flow Once you have a preliminary layout, get an initial estimation off Board Timing parameters (board skews, setup/hold derating and ISI/Crosstalk parameters. In some cases 40 ohm trace can work better than 50 ohm trace. Simulate your External memory interface related traces for the impedance.
![intel fpga simulation intel fpga simulation](https://i.ytimg.com/vi/3flfQ89hngM/maxresdefault.jpg)
Layout guidelines for various protocols can be found in the Volume 2 of the Altera EMIF handbook. Pre-layout simulation Guidanceįollow Altera layout guidelines for length and skew matching. Note: Content on this page is applicable for DDR3, DDR4, RLDRAM3 and QDR IV, unless specifically mentioned otherwise. This page also provides simulation guidance. This page explains how to extract the parameters to be entered in the 'Board Timing' tab of the Arria 10 External memory Interfaces GUI. The DSP Builder software version 21.1 supports the following EDA tools.9/92/Arria10_Simulation_Flow.jpg Objective
![intel fpga simulation intel fpga simulation](http://myrobotlab.org/sites/default/files/users/user25images/fpga_007.png)
Intel Questa Intel FPGA Edition(For std only) Contact Synopsys for versions of Synopsys Synplify, Synplify Pro, and Synplify Premier Precision that support Intel Quartus Prime Standard Edition Software Release Version 21.1.