50 Chapter 3 Altera ® Stratix ® Series Arria ® Series Cyclone ® Series Stratix ® IV Stratix ® IV E Stratix IV GX Stratix ® IV GT ® Stratix ® III Stratix ® III E Stratix ® III L Stratix ® II Stratix ® II GX Stratix ® II Stratix ® I Stratix ® I GX Stratix ® I Arria ® II Arria ® II GX Arria ® Arria ® GX Cyclone ® III Cyclone ® II Cyclone ® Figure 3­6: Altera Series Tree Figure 3­6 shows the family members for these series. Xilinx offers numerous FPGA families. Some of their families include Extended Spartan W -3A, W Spartan-3E, Spartan 6, Virtex , Virtex-E, Virtex-Pro, Virtex 5, and Virtex 6. These families are divided into members based on the amount of available resources. For example, Spartan-3E is a high-volume FPGA that has five family members, see Table 3­1. Note: The number