Some variations of the XC4000 family are no longer recommendedfor new designs. These include the XC4000 standardfamily, XC4000A, XC4000D, and XC4000H (referredto in this application note as the older XC4000 families).These have been superseded by the newer XC4000 Seriesfamilies, which include the XC4000E, XC4000L,XC4000EX, and XC4000XL families. Designs in the olderversions of the XC4000 can be converted to the newXC4000 Series. In some cases, particularly for XC4000Ddesigns or other designs not including RAM, the XC5200family should be considered for its lower cost. For a discussionof converting XC4000 family designs to the XC5200family, see the Xilinx application note XAPP060, “DesignMigration from XC4000 to XC5200.”
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