Answers Database M1 CPLD: How does the CPLD Auto Device Selection Work Record #2704 Product Family: Software Product Line: CPLD Implementation Product Part: hitop Product Version: 1.3 Problem Title: M1 CPLD: How does the CPLD Auto Device Selection Work Problem Description: Urgency: Standard General Description: How does the CPLD fitter automatically chooses a device for the target design? Solution 1: If you select XC9500 as the Family in the Part Selector window and choose "All" for Device, Package and Speed Grade filters, the software is free to choose any device in the selected family. Auto Device, Package and Speed Grade Selection If you do not choose "All" for all the filters, but just for one or two of them, the software tries to fit your design within the range of possible devices you have selected by using the following selection criteria: 1. First, the software selects the smallest die. 2. Second, the software selects the smallest package. 3. Third, the software selects the fastest speed-grade device     for the selected device. Auto Package and Speed Grade Selection for a selected Device The software will continue to try fitting your design into one of the possible range of selected devices until the first usable one is found or until there are no more devices to try. End of Record #2704 - Last Modified: 01/20/98 13:21

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