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 These have been superseded by the newer XC4000 Series families, which include the XC4000E, XC4000L, XC4000EX, and XC4000XL families.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