【应用手册】AN 557: Stratix III-to-Stratix IV E Cross-Family Migration Guidelines This application note provides guidelines in cross-family migration designs between the Altera® Stratix® III and Stratix IV E device family variant using the Quartus® II software. Use these guidelines for drop-in replacement of either device placed on a single PCB through your hardware design. Altera recommends using the following guidelines throughout your PCB design process to ensure a seamless migration of designs from Stratix III-to-Stratix IV E devices. You can design your Stratix III FPGAs to take advantage of the higher performance, higher density, and lower power benefits of Stratix IV E FPGAs. With up-front planning that considers the different power supply voltages and available packages in both families, it is possible to design a PCB assembled with either a Stratix III or a Stratix IV E device in the same package. Cross-family migration between Stratix III and Stratix IV E FPGAs allows you to design with Stratix III FPGAs today and move to Stratix IV E FPGAs in the future without changing the device pin-outs or the PCB layout. AN 557: Stratix III-to-Stratix IV E Cross-Family Migration Guidelines September 2009 AN-557-2.0 Introduction This application note provides guidelines in cross-family migration designs between the Altera Stratix III and Stratix IV E device family variant using the Quartus II software. Use these guidelines for drop-in replacement of either device placed on a single PCB through your hardware design. Altera recommends using the following guidelines thro……