Create Topology Template

In a High Speed environment, the Create Topology Template dialog allows you to create a topology template that is based on a predefined one that is supplied in eCADSTAR. You can specify the number of inputs and define its name in this dialog. The topology templates that you create can be assigned to the E-Nets in the design using the Assign Topology Template dialog. They are not available in other designs. Launch the Create Topology Template dialog by clicking in the Topology Template Manager dialog, Topology template section. Alternatively, click Create Template in the Assign Topology Template dialog.

 

 

Value	Description
Predefined topology template list	Displays the predefined topology templates that are supplied in eCADSTAR. You can specify the number of inputs and define its name in this dialog. Click a value to view the topology template in the Preview box. You can also specify the number of inputs associated with the selected topology template, and define its name. The following table provides a description of each one. The Extensible for More Receivers? column indicates whether a topology template is point-to-point, or can be extended for the relevant signal. Note The topology templates that are listed may not be topologically compatible with the E-Nets in the Assign Topology Template dialog. Topology template Topology Group Description Single-Ended or Differential? Extensible for More Receivers? <New Single Ended Topology> Generic A simple single-ended topology template. Single-Ended Yes <New Differential Pair Topology> Generic A differential pair topology template. Differential Yes Branched_NearEndSeriesTerm Generic A branched topology template, with a single, near-end, series termination. Single-Ended Yes DDR3_4_ADDR_CMD_CTRL SDRAM (Synchronous Dynamic RAM) For DDR3 or DDR4, this topology template applies to command and control signals, where the write-levelling feature of these types of SDRAM is used. The SDRAMs must also be placed and routed sequentially in a Fly-by topology, as defined by JEDEC. The accompanying differential clock topology template is DDR3_4_CK. Single-Ended Yes DDR3_4_CK SDRAM (Synchronous Dynamic RAM) For DDR3 or DDR4, this topology template applies to the differential clock signal associated with command and control signals, where the write-levelling feature of these types of SDRAM is used. The SDRAMs must also be placed and routed sequentially in a Fly-by topology, as defined by JEDEC. The accompanying topology template for the command and control signal is DDR3_4_ADDR_CMD_CTRL. Differential Yes DDR3_4_DQ SDRAM (Synchronous Dynamic RAM) For DDR3 and DDR4, this topology template applies to DQ signals that are bidirectional and point-to-point. The topology template for the accompanying differential strobe signal is DDR3_4_DQS. Single-Ended No DDR3_4_DQS SDRAM (Synchronous Dynamic RAM) For DDR3 and DDR4, this topology template applies to differential strobe topology (DQS) signals that are bidirectional and point-to-point. The topology template for the accompanying DQ signal is DDR3_4_DQ. Differential No DDaisy_FarEndDMTerm Generic A differential, daisy chain topology template. A differential termination is located at the far-end. Differential Yes DDaisy_FarEndOMTerm Generic A differential, daisy chain topology template. An odd-mode termination is located at the far-end. Differential Yes DHSTL_Class_II_Flyby HSTL (High-Speed Transceiver Logic) A Class II, High-Speed Transceiver Logic template for differential signals, in a Fly-by topology. You can adjust these topology templates for signals that have a larger numbers of receivers. Standards for HSTL, including EIA/JESD8-6, are defined by JEDEC. Check that the topology template is suitable for your requirements. The prefix “D” denotes that the signal is differential. Differential Yes DHSTL_Class_I_Flyby HSTL (High-Speed Transceiver Logic) A Class I, High-Speed Transceiver Logic template for differential signals, in a Fly-by topology. You can adjust these topology templates for signals that have a larger numbers of receivers. Standards for HSTL, including EIA/JESD8-6, are defined by JEDEC. Check that the topology template is suitable for your requirements. The prefix “D” denotes that the signal is differential. Differential Yes DSSTL_Class_II_Flyby SSTL(Stub Series-Terminated Logic) A Class II, Stub Series Terminated Logic template for differential signals, in a Fly-by topology. You can adjust this topology template for signals that have a larger numbers of receivers. Check that it is suitable for your requirements: for example, 1.8V SSTL is used in some SDRAM interfaces, and is defined by EIA/JESD8-15A. SSTL standards are defined by JEDEC. The prefix “D” denotes that the signal is differential. Differential Yes DSSTL_Class_I_Flyby SSTL(Stub Series-Terminated Logic) A Class I, Stub Series Terminated Logic template for differential signals, in a Fly-by topology. You can adjust this topology template for signals that have a larger numbers of receivers. Check that it is suitable for your requirements: for example, 1.8V SSTL is used in some SDRAM interfaces, and is defined by EIA/JESD8-15A. SSTL standards are defined by JEDEC. The prefix “D” denotes that the signal is differential. Differential Yes DTBranch Generic A differential T-Branch topology template (Balanced H-Tree). Differential Yes Daisy_FarEndTerm Generic A single-ended, daisy chain, topology template that has far-end termination. Single-Ended Yes Diff_Series_Caps Generic A differential, point-to-point, topology template that has AC coupling capacitors. Differential No Diff_Simple Generic A differential, point-to-point, topology template. Differential No HSTL_Class_II_Flyby HSTL (High-Speed Transceiver Logic) A Class II, High-Speed Transceiver Logic template for single-ended signals, in a Fly-by topology. You can adjust these topology templates for signals that have a larger numbers of receivers. Standards for HSTL, including EIA/JESD8-6, are defined by JEDEC. Check that the topology template is suitable for your requirements. Single-Ended Yes HSTL_Class_I_Flyby HSTL (High-Speed Transceiver Logic) A Class I, High-Speed Transceiver Logic template for single-ended signals, in a Fly-by topology. You can adjust these topology templates for signals that have a larger numbers of receivers. Standards for HSTL, including EIA/JESD8-6, are defined by JEDEC. Check that the topology template is suitable for your requirements. Single-Ended Yes SSTL_Class_II_Flyby SSTL (Stub Series-Terminated Logic) A Class II, Stub Series Terminated Logic template for single-ended signals, in a Fly-by topology.  You can adjust this topology template for signals that have a larger numbers of receivers. Check that it is suitable for your requirements: for example, 1.8V SSTL is used in some SDRAM interfaces, and is defined by EIA/JESD8-15A. SSTL standards are defined by JEDEC. Single-Ended Yes SSTL_Class_I_Flyby SSTL (Stub Series-Terminated Logic) A Class I, Stub Series Terminated Logic template for single-ended signals, in a Fly-by topology. You can adjust this topology template for signals that have a larger numbers of receivers. Check that it is suitable for your requirements: for example, 1.8V SSTL is used in some SDRAM interfaces, and is defined by EIA/JESD8-15A. SSTL standards are defined by JEDEC. Single-Ended Yes TBranch Generic A single-ended, T-Branch, topology template (Balanced H-Tree). Single-Ended Yes
Number of inputs	The number of receivers in the topology template, not including the driver. If you launch this dialog from the Assign Topology Template dialog, then this value is automatically set to the number of receivers of the selected E-Net. The image of the selected topology template is immediately updated in the Preview box to display the specified number of receivers. For all topology templates except Branched_NearEndSeriesTerm, DTBranch and TBranch: specify a value between 1 and 32. For the Branched_NearEndSeriesTerm, DTBranch and TBranch topology templates: specify a value between 2 and 32. If you select the displayed value, then you can change it using the middle button on the mouse.
Name	Allows you to specify a unique name of the topology template that you create, based on the predefined one that you select. Spaces are not permitted in the name. By default the name "NewTopoTemplate-[n]" is used.
Preview	Displays an image of the topology template that you select in the Predefined topology template list. The image is immediately updated to display the number of receivers that specify in the Number of inputs box. You cannot edit this image. To delete tiles in the topology template, select it in the Tile Editor, in the Topology Template Manager, and press Delete on the keyboard.
OK	Saves the topology template that you create, based on the predefined one that you select. The topology template is saved with the specified name and number of receivers. This dialog is closed, and the new topology template is displayed in the Topology Template Manager dialog, Topology template table.
Cancel	Closes this dialog without creating a new topology template. The Topology Template Manager remains open.