element14 Community
element14 Community
    Register Log In
  • Site
  • Search
  • Log In Register
  • Community Hub
    Community Hub
    • What's New on element14
    • Feedback and Support
    • Benefits of Membership
    • Personal Blogs
    • Members Area
    • Achievement Levels
  • Learn
    Learn
    • Ask an Expert
    • eBooks
    • element14 presents
    • Learning Center
    • Tech Spotlight
    • STEM Academy
    • Webinars, Training and Events
    • Learning Groups
  • Technologies
    Technologies
    • 3D Printing
    • FPGA
    • Industrial Automation
    • Internet of Things
    • Power & Energy
    • Sensors
    • Technology Groups
  • Challenges & Projects
    Challenges & Projects
    • Design Challenges
    • element14 presents Projects
    • Project14
    • Arduino Projects
    • Raspberry Pi Projects
    • Project Groups
  • Products
    Products
    • Arduino
    • Avnet & Tria Boards Community
    • Dev Tools
    • Manufacturers
    • Multicomp Pro
    • Product Groups
    • Raspberry Pi
    • RoadTests & Reviews
  • About Us
    About the element14 Community
  • Store
    Store
    • Visit Your Store
    • Choose another store...
      • Europe
      •  Austria (German)
      •  Belgium (Dutch, French)
      •  Bulgaria (Bulgarian)
      •  Czech Republic (Czech)
      •  Denmark (Danish)
      •  Estonia (Estonian)
      •  Finland (Finnish)
      •  France (French)
      •  Germany (German)
      •  Hungary (Hungarian)
      •  Ireland
      •  Israel
      •  Italy (Italian)
      •  Latvia (Latvian)
      •  
      •  Lithuania (Lithuanian)
      •  Netherlands (Dutch)
      •  Norway (Norwegian)
      •  Poland (Polish)
      •  Portugal (Portuguese)
      •  Romania (Romanian)
      •  Russia (Russian)
      •  Slovakia (Slovak)
      •  Slovenia (Slovenian)
      •  Spain (Spanish)
      •  Sweden (Swedish)
      •  Switzerland(German, French)
      •  Turkey (Turkish)
      •  United Kingdom
      • Asia Pacific
      •  Australia
      •  China
      •  Hong Kong
      •  India
      •  Japan
      •  Korea (Korean)
      •  Malaysia
      •  New Zealand
      •  Philippines
      •  Singapore
      •  Taiwan
      •  Thailand (Thai)
      •  Vietnam
      • Americas
      •  Brazil (Portuguese)
      •  Canada
      •  Mexico (Spanish)
      •  United States
      Can't find the country/region you're looking for? Visit our export site or find a local distributor.
  • Translate
  • Profile
  • Settings
Avnet Boards Forums
  • Products
  • Dev Tools
  • Avnet & Tria Boards Community
  • Avnet Boards Forums
  • More
  • Cancel
Avnet Boards Forums
ZedBoard Hardware Design differential PIn
  • Forum
  • Documents
  • Members
  • Mentions
  • Sub-Groups
  • Tags
  • More
  • Cancel
  • New
Join Avnet Boards Forums to participate - click to join for free!
Actions
  • Share
  • More
  • Cancel
Forum Thread Details
  • State Verified Answer
  • Replies 3 replies
  • Subscribers 353 subscribers
  • Views 462 views
  • Users 0 members are here
Related

differential PIn

Former Member
Former Member over 9 years ago

Hi all,

I have in my entity those Input :
       LVDS1_CAP: input
       LVDS1_CAN: input
       LVDS1_CA : output

       LVDS1_CBP: input
       LVDS1_CBN: input
       LVDS1_CB : output

I have created my file IOBFDS :

IBUF_inst_LVDS1_CA : IBUFDS
             generic map (
                IOSTANDARD => "LVDS_25")
             port map (
                O => LVDS1_CA,   
                I => LVDS1_CAP,
                  IB => LVDS1_CAN       
             );
            
              IBUF_inst_LVDS1_CB : IBUFDS
                         generic map (
                            IOSTANDARD => "LVDS_25")
                         port map (
                            O => LVDS1_CB,   
                            I => LVDS1_CBP,
                              IB => LVDS1_CBN       
                         );


with the LVDS1_CAN and CAP they had been declared in pin p17

but for LVDS1_CBP it shows me this error:

[Vivado 12-1411] Cannot set LOC property of ports, Could not legally place instance Inst_input_buffers/IBUF_inst_LVDS1_CB at M21 (IOB_X1Y70) since it belongs to a shape containing instance LVDS1_CBN. The shape requires relative placement between Inst_input_buffers/IBUF_inst_LVDS1_CB and LVDS1_CBN that cannnot be honored because it would result in an invalid location for LVDS1_CBN. ["D:/2014.1/init.2/Viimagic_2.1/Viimagic_2.1.srcs/constrs_1/imports/new/Viimagic.xdc":47]

I don't understand I have done the same declaration and it doesn't work for both pins.

Ps: i have done my project first at 2015.3 evrything was fine.
But now i have done the same thing at 2014.1 it shows me this wired error.

Could someone help me please.

Thank you for your quick feedbacks.

-Anisse BELMAJY

  • Sign in to reply
  • Cancel
  • Former Member
    0 Former Member over 9 years ago

    Hi,

    It works finally I just make

    #O => LVDS1_CB  in comment then it works.

    vivado is really EASY AND weired.

    - Anisse BELMAJY

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • Reject Answer
    • Cancel
  • albertabeef
    0 albertabeef over 9 years ago in reply to Former Member

    Anisse,

    If you are using IPI, you can also use the "Utility Buffer" core.

    The Xilinx Base TRD implements an LVDS input clock using this technique.

    They use two instances of the "Utility Buffer" core in series.

    The first one is configured as "IBUFDS", the second one as "BUFG".

    The LVDS input clock is connected as a single external port of type "diff_clock".

    Regards,

    Mario.

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • Verify Answer
    • Cancel
  • Former Member
    0 Former Member over 9 years ago

    Thank you so much Mario.
    It works finally

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • Verify Answer
    • Cancel
element14 Community

element14 is the first online community specifically for engineers. Connect with your peers and get expert answers to your questions.

  • Members
  • Learn
  • Technologies
  • Challenges & Projects
  • Products
  • Store
  • About Us
  • Feedback & Support
  • FAQs
  • Terms of Use
  • Privacy Policy
  • Legal and Copyright Notices
  • Sitemap
  • Cookies

An Avnet Company © 2026 Premier Farnell Limited. All Rights Reserved.

Premier Farnell Ltd, registered in England and Wales (no 00876412), registered office: Farnell House, Forge Lane, Leeds LS12 2NE.

ICP 备案号 10220084.

Follow element14

  • X
  • Facebook
  • linkedin
  • YouTube