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https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/Creating-Implementation-Constraints Creating Implementation Constraints - Creating Implementation Constraints - 2023.2 English - UG903 After you have a synthesized netlist, you can load it into memory together with the XDC files or Tcl scripts enabled for implementation. You must review the... creating implementation constraints english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/About-Generated-Clocks?contentId=_tF8LszmDSxlIHKc79yovw About Generated Clocks - About Generated Clocks - 2025.2 English - UG903 Generated clocks are driven inside the design by special cells called Clock Modifying Blocks (for example, an MMCM), or by some user logic. Generated clocks... generated clocks english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/Replacing-all_registers-Queries?contentId=BwFboEm3LUUn1EoXvYVP2Q Replacing all_registers Queries - Replacing all_registers Queries - 2025.2 English - UG903 The following are some additional query recommendations: Avoid queries using all_registers whenever possible, as they tend to create large collections of... replacing registers queries english https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/Defining-Relatively-Placed-Macros Defining Relatively Placed Macros - Defining Relatively Placed Macros - 2023.2 English - UG903 defining relatively placed macros english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/Constraining-Bus-Skew?contentId=DUnaYp0vNkTTX6dU7VJ14g Constraining Bus Skew - Constraining Bus Skew - 2025.2 English - UG903 bus skew english https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/Routing-Constraints?contentId=hrJRRMbkhwqNrDPObyr2Ng Routing Constraints - Routing Constraints - 2023.2 English - UG903 Routing constraints are applied to net objects to control their routing resources. routing constraints english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/XDC-File-Scoping-Properties?contentId=Ez1t~90IuUkc934XPnfqJw XDC File Scoping Properties - XDC File Scoping Properties - 2025.2 English - UG903 The constraints scoping mechanism is activated by specifying the following properties on the XDC files: SCOPED_TO_REF This property takes the name of a module... xdc file scoping properties english https://docs.amd.com/r/2022.1-English/ug903-vivado-using-constraints/Input-Delays Input Delays - Input Delays - 2022.1 English - UG903 The Timing Constraints wizard analyzes all paths from input ports to identify their destination clock inside the design and their active edges. Based on this... input delays english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/update_macro update_macro - update_macro - 2023.1 English - UG903 The update_macro command adds leaf cells and relative placements (RLOCs) to the macro. The RLOC has identical syntax and functionality as the RPM RLOC... update macro english https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/create_macro?contentId=s3X3I2Oz9HDTLQxInRRBpw create_macro - create_macro - 2023.2 English - UG903 The create_macro command creates a new macro object. Macro names must be unique. Attempting to create a macro with the same name as an existing macro generates... create macro english https://docs.amd.com/r/2022.1-English/ug903-vivado-using-constraints/Advanced-XDC-Templates Advanced XDC Templates - Advanced XDC Templates - 2022.1 English - UG903 Some advanced templates such as System Synchronous and Source Synchronous I/O delay constraints require you to set some Tcl variables to capture the design... advanced xdc templates english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Please-Read-Important-Legal-Notices Please Read: Important Legal Notices - Please Read: Important Legal Notices - 2023.1 English - UG903 The information presented in this document is for informational purposes only and may contain technical inaccuracies, omissions, and typographical errors. The... important legal notices please read english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/Add-Delay-Input-Delay-Command-Option?contentId=McwuKa1apUe64xi0RP_TTg Add Delay Input Delay Command Option - Add Delay Input Delay Command Option - 2025.2 English - UG903 The -add_delay option must be used if: A max (or min) input delay constraint exists, and You want to specify a second max (or min) input delay constraint on... add delay input command option https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/Forwarded-Clocks Forwarded Clocks - Forwarded Clocks - 2023.2 English - UG903 The Timing Constraints wizard recommends generated clock constraints on output ports that are driven by double data-rate registers with constant inputs. Based... forwarded clocks english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Automatically-Derived-Clock-Example Automatically Derived Clock Example - Automatically Derived Clock Example - 2023.1 English - UG903 The following automatically derived clock example is a clock generated by an MMCM. The master clock clkin drives the input CLKIN of the MMCME2 instance... automatically derived clock example english https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/set_multicycle_path-Syntax?contentId=qFT7zYQcU1xvAMhlOKu5vg set_multicycle_path Syntax - set_multicycle_path Syntax - 2023.2 English - UG903 set multicycle path syntax english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/About-Constraints-Methodology About Constraints Methodology - About Constraints Methodology - 2025.2 English - UG903 Design constraints define the requirements that must be met by the compilation flow in order for the design to be functional on the board. Not all constraints... constraints methodology english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Managing-Macros Managing Macros - Managing Macros - 2023.1 English - UG903 Macros are stored as XDC constraints. By definition, they are Tcl commands. This allows the macros to be used in both XDC constraint files and Tcl scripts, and... managing macros english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Automatically-Derived-Clocks?contentId=~nsQW1MWpRke_6d3sd_bTw Automatically Derived Clocks - Automatically Derived Clocks - 2023.1 English - UG903 Automatically derived clocks are also called auto-generated clocks. The Vivado IDE automatically creates the constraint for these on the output pins of the... automatically derived clocks english https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/Creating-Implementation-Constraints?contentId=RLSYIZLIOhqylbjlgap~5A Creating Implementation Constraints - Creating Implementation Constraints - 2023.2 English - UG903 After you have a synthesized netlist, you can load it into memory together with the XDC files or Tcl scripts enabled for implementation. You must review the... creating implementation constraints english https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/Generated-Clocks Generated Clocks - Generated Clocks - 2023.2 English - UG903 This section discusses generated clocks and includes: About Generated Clocks User Defined Generated Clocks Automatically Derived Clocks Automatically Derived... generated clocks english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Relative-Slice-Based-Coordinates?contentId=5WlStXEnUCt1yKxTtVfheQ Relative Slice-Based Coordinates - Relative Slice-Based Coordinates - 2023.1 English - UG903 The relative grid system: Is also known as the standard grid. Is sufficient for most RPMs. Is used for homogeneous RPMs in which all cells in an RPM belong to... relative slice based coordinates english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Preserving-RPM-through-opt_design?contentId=XT3TMUNNnVY793Udcx9mSg Preserving RPM through opt_design - Preserving RPM through opt_design - 2023.1 English - UG903 opt_design is free to optimize and remove some LUTs that belong to an RPM despite the RLOC constraint. To prevent opt_design from optimizing the logic inside... preserving rpm opt design english https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/Relative-Slice-Based-Coordinates Relative Slice-Based Coordinates - Relative Slice-Based Coordinates - 2023.2 English - UG903 The relative grid system: Is also known as the standard grid. Is sufficient for most RPMs. Is used for homogeneous RPMs in which all cells in an RPM belong to... relative slice based coordinates english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/Automatically-Derived-Clocks Automatically Derived Clocks - Automatically Derived Clocks - 2025.2 English - UG903 Automatically derived clocks are also called auto-generated clocks. The Vivado IDE automatically creates the constraint for these on the output pins of the... automatically derived clocks english https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/Elaborated-Design-Constraints?contentId=e4vbjkX0e6fOUQGt8ZOtbw Elaborated Design Constraints - Elaborated Design Constraints - 2023.2 English - UG903 Recommended: When you create the first version of your synthesis XDC, use simple timing constraints to describe the high-level design requirements. At this... design constraints english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Renaming-Auto-Derived-Clocks?contentId=G~jMz0WNB2Hw8L3uCrIMIA Renaming Auto-Derived Clocks - Renaming Auto-Derived Clocks - 2023.1 English - UG903 It is possible to rename the generated clocks that are automatically created by the tool. The renaming process consists in calling the create_generated_clock... renaming auto derived clocks english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/Creating-an-RPM?contentId=VhIUCb0zNiFILFM4Cku2hg Creating an RPM - Creating an RPM - 2025.2 English - UG903 To create an RPM: Group cells into a set. Define relative locations for cells in the RPM set. Specify an RLOC_ORIGIN constraint or a LOC constraint on an RPM... creating rpm english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/Propagated-Clocks?contentId=X9uslYPiCqueK_0doCXXUg Propagated Clocks - Propagated Clocks - 2025.2 English - UG903 The period and waveform properties represent the ideal characteristics of a clock. When entering the FPGA and propagating through the clock tree, the clock... clocks english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/User-Interface-Option?contentId=z069CPawNLHP6Z7yLQS3jw User Interface Option - User Interface Option - 2025.2 English - UG903 Because the Vivado IDE manages your constraints, you do not edit your XDC files at the same time. When the Vivado IDE saves the memory content, the following... user interface option english https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/create_macro create_macro - create_macro - 2023.2 English - UG903 The create_macro command creates a new macro object. Macro names must be unique. Attempting to create a macro with the same name as an existing macro generates... create macro english https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/Single-Bit-Register-Names Single-Bit Register Names - Single-Bit Register Names - 2023.2 English - UG903 By default, the register name is based on the signal name in the RTL, plus the _reg suffix. For example, for a signal defined as follows in VHDL and Verilog,... register names single bit english https://docs.amd.com/r/2022.1-English/ug903-vivado-using-constraints/Propagated-Clocks Propagated Clocks - Propagated Clocks - 2022.1 English - UG903 The period and waveform properties represent the ideal characteristics of a clock. When entering the FPGA and propagating through the clock tree, the clock... clocks english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Exclusive-Clock-Groups-Example?contentId=G_XzBU24rn6wCW4bcWdVZA Exclusive Clock Groups Example - Exclusive Clock Groups Example - 2023.1 English - UG903 An MMCM instance generates clk0 and clk1 which are connected to the BUFGMUX instance clkmux. The output of clkmux drives the design clock tree. By default, the... exclusive clock groups example english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Valid-Commands-in-an-XDC-File?contentId=0KKbxgeIeIS2elyb7nbVLQ Valid Commands in an XDC File - Valid Commands in an XDC File - 2023.1 English - UG903 Table 1. Valid Commands in an XDC File Timing Constraint Physical Constraint General Purpose create_clock create_generated_clock group_path set_clock_groups... valid commands xdc file english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Syntax-of-the-set_bus_skew-Command?contentId=SPwXkGAIs4Jyp3Bbw3tXSQ Syntax of the set_bus_skew Command - Syntax of the set_bus_skew Command - 2023.1 English - UG903 of the syntax set bus https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Exceptions-Priority-Example?contentId=hq3vMUVTmSoKNzQgP~heGw Exceptions Priority Example - Exceptions Priority Example - 2023.1 English - UG903 exceptions priority example english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Moving-the-Setup Moving the Setup - Moving the Setup - 2023.1 English - UG903 The following examples show the results of moving the setup: Example One: Setup=5 / Hold Moved Accordingly Example Two: Setup=5 / Hold=4 the setup moving english https://docs.amd.com/r/2022.1-English/ug903-vivado-using-constraints/Renaming-Auto-Derived-Clocks?contentId=MK4DmK164wtTKKDw6oQRpA Renaming Auto-Derived Clocks - Renaming Auto-Derived Clocks - 2022.1 English - UG903 It is possible to rename the generated clocks that are automatically created by the tool. The renaming process consists in calling the create_generated_clock... renaming auto derived clocks english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Multicycle-Paths?contentId=OsXr6DIZMPx~Sp4hcv~sww Multicycle Paths - Multicycle Paths - 2023.1 English - UG903 The Multicycle Path constraint allows you to modify the setup and hold relationships determined by the timer, based on the design clock waveforms. By default,... multicycle paths english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/Macro-Properties?contentId=UApmaePuZgnJTn8wzbqhcQ Macro Properties - Macro Properties - 2025.2 English - UG903 Macro objects have the following properties: ABSOLUTE_GRID CLASS NAME RLOCS macro properties english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/Organizing-Your-Constraints?contentId=yUIhzQdPSaHDzcmrgWRIHw Organizing Your Constraints - Organizing Your Constraints - 2025.2 English - UG903 The Vivado IDE allows you to use one or many constraint files. While using a single constraint file for the entire compilation flow might seem more convenient,... organizing constraints english https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/Propagated-Clocks?contentId=wIsvId8iD_4pyua8hoxZoQ Propagated Clocks - Propagated Clocks - 2023.2 English - UG903 The period and waveform properties represent the ideal characteristics of a clock. When entering the FPGA and propagating through the clock tree, the clock... clocks english https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/Training-Resources?contentId=BAUVTuaukRBWLdoLIpzg1g Training Resources - Training Resources - 2023.2 English - UG903 AMD provides a variety of training courses and QuickTake videos to help you learn more about the concepts presented in this document. Use these links to... training resources english https://docs.amd.com/r/2023.2-English/ug903-vivado-using-constraints/Placement-Constraint-Examples Placement Constraint Examples - Placement Constraint Examples - 2023.2 English - UG903 Placement Constraint Example One Locate a block RAM at RAMB18_X0Y10 and fix its location. % set_property LOC RAMB18_X0Y10 [get_cells u_ctrl0/ram0] Placement... placement constraint examples english https://docs.amd.com/r/2022.1-English/ug903-vivado-using-constraints/Primary-Clocks-Examples Primary Clocks Examples - Primary Clocks Examples - 2022.1 English - UG903 As shown in the following figure, the board clock enters the device through the port sysclk, then propagates through an input buffer and a clock buffer before... primary clocks examples english https://docs.amd.com/r/2022.1-English/ug903-vivado-using-constraints/Using-Input-Delay-Options?contentId=sKF7EgUuur3Jna30jON_Cg Using Input Delay Options - Using Input Delay Options - 2022.1 English - UG903 Although the -clock option is optional in the Synopsys Design Constraints (SDC) standard, it is required by the Vivado IDE. The relative clock can be either a... using input delay options english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/Disabling-Timing-Arcs?contentId=dVFcHuZb~EtuWB2ibIvrcw Disabling Timing Arcs - Disabling Timing Arcs - 2025.2 English - UG903 You can disable timing arcs inside the cell with the set_disable_timing command. Only timing arcs going from input to output ports of a cell can be disabled.... disabling timing arcs english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/Example-Two-Setup-5/Hold-4?contentId=HlxElsrMC~sFTmDuD7oK5A Example Two: Setup=5 / Hold=4 - Example Two: Setup=5 / Hold=4 - 2025.2 English - UG903 This example assumes that the following are defined: A setup multiplier of five (5) A hold multiplier of four (4) (that is, 5-1) This corresponds to a transfer... example two setup hold english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Creating-Synthesis-Constraints?contentId=bg31vaa4UFZBa70~pemtxA Creating Synthesis Constraints - Creating Synthesis Constraints - 2023.1 English - UG903 The Vivado Synthesis transforms the RTL description of your design into a technology mapped netlist. This process happens in several steps, and includes a... creating synthesis constraints english https://docs.amd.com/r/2023.1-English/ug903-vivado-using-constraints/Moving-the-Setup?contentId=il7FxSQDPNBogTBkrg07eA Moving the Setup - Moving the Setup - 2023.1 English - UG903 The following examples show the results of moving the setup: Example One: Setup=5 / Hold Moved Accordingly Example Two: Setup=5 / Hold=4 the setup moving english https://docs.amd.com/r/en-US/ug903-vivado-using-constraints/Primary-Clocks-Examples Primary Clocks Examples - Primary Clocks Examples - 2025.2 English - UG903 As shown in the following figure, the board clock enters the device through the port sysclk, then propagates through an input buffer and a clock buffer before... primary clocks examples english https://docs.amd.com/r/2022.1-English/ug903-vivado-using-constraints/Constraining-Asynchronous-Signals Constraining Asynchronous Signals - Constraining Asynchronous Signals - 2022.1 English - UG903 The set_max_delay command can also be used to constrain asynchronous signals that do not have a clock relationship, but which require maximum delay. For... asynchronous signals english