XC5200 Implementation Template Dialog Box

Click the Optimize and Map, Place and Route, Timing Reports, or Interface tab to access the different options within the Implementation Template dialog box. Use the different tabs of this dialog box to set the options described in this section.

Click OK to accept the template, click Cancel to exit the dialog box without changing any settings, click Default to set the default options, or click Help to obtain online help.

XC5200 Optimize and Map Tab

Use the Optimize and Map tab, shown in the following figure, to set these options.

Figure 5.45 XC5200 Implementation Template Optimize and Map Tab

Logic Optimization Options

The Logic Optimization Options field contains the following options.

• Trim Unconnected Logic
  
  Select this option to trim unconnected components and nets from the design before mapping occurs. Deselect this option to map unconnected components and nets. Deselecting this option is useful for estimating the logic resources required for a design and for obtaining timing information on partially finished designs. When implementing an unfinished design, deselect this option to prevent partial logic from being trimmed. By default, this option is on.
  
  
• Replicate Logic to Allow Logic Level Reduction
  
  Use this option to replicate a single driver that drives multiple loads and map it as separate components that drive individual loads. This option is useful for creating a mapping strategy that may more readily meet your timing constraints. It reduces the number of logic elements through which a signal must pass, thereby eliminating path delays. By default, this option is on.
  
  
• Generate 5-Input Functions
  
  Select this option to map each five-input logic function to a single CLB. This option can sometimes reduce the number of cell-to-cell delays at the expense of increased CLB count. By default, this option is off.
  
  

Map Options

The Map Options field contains the CLB Packing Strategy option. This option partitions logic more densely. Normally, the mapper partitions logic to maximize signal sharing within CLBs and to minimize routing congestion. The CLB Packing Strategy option optimizes density by relaxing the requirement for a high degree of signal sharing between logic elements in a CLB, using the DI (direct flip-flop input) pins on CLBs, and reducing minimum signal combining requirements. The default is Fit Device.

NOTE

Although the CLB Packing Strategy option makes a design denser, it can also adversely affect place and route performance, resulting in higher delays and more unrouted nets. Use this option if you are willing to trade performance for density.

• Fit Device
  
  Select Fit Device to pack logic elements that do not share common signals into the CLBs. The mapper continues packing until the design fits into the selected device or no further packing is possible.
  
  
• Off
  
  Select Off to disable the CLB Packing Strategy option. Disabling this option causes only related logic (logic with common inputs) to be packed together. This is useful for increasing speed in high speed designs. However, the design may overflow the selected part due to the increase in CLBs used.
  
  

XC5200 Place and Route Tab

Use the Place and Route tab, shown in the following figure, to set the place and route options.

Figure 5.46 XC5200 Implementation Template Place and Route Tab

The XC5200 Place and Route tab is identical to the tab described in the “Spartan Place and Route Tab” section.

XC5200 Timing Reports Tab

Use the Timing Reports tab, shown in the following figure, to set the timing reports options.

Figure 5.47 XC5200 Implementation Template Timing Reports Tab

The XC5200 Timing Reports tab is identical to the tab described in the “Spartan Timing Reports Tab” section.

XC5200 Interface Tab

Use the Interface tab, shown in the following figure, to set the translation options.

Figure 5.48 XC5200 Implementation Template Interface Tab

The XC5200 Interface tab is identical to the tab described in the “Spartan Interface Tab” section.