The XC4000E is an enhanced architecture based on the XC4000 family, but offers many new features, particularly Select-RAMTM memory. When converting XC4000, XC4000A, XC4000D, and XC4000H designs, the XC4000E is an excellent choice. The conversion process may be as simple as downloading the same bitstream into the XC4000E device (XC4000 and XC4000D bitstreams only), or it may involve changes to the schematic or HDL code. This Application Note describes techniques that should be employed to convert from any of the XC4000, XC4000A, XC4000D, or XC4000H families to the XC4000E family.