The GX3700 is a user configurable, FPGA-based, 3U PXI card which offers 160 digital I/O signals which can be configured for single-ended or differential interfaces. The card employs the Altera Stratix  III FPGA, which can support SerDes data rates up to 1.2 Gb/s, digital I/O clock rates of 700 MHz, and features 47,500 logic elements and 2.1 kb of memory. The GX3700 is supplied with an integral expansion board providing access to the FPGA’s 160 I/Os. Alternatively, users can design their own custom expansion cards for specific applications – eliminating the need for additional external boards which are cumbersome and physically difficult to integrate into a test system. The design of the FPGA is done by using Altera’s free Quartus II Web Edition tool set. Once the user has compiled the FPGA design, the configuration file can be loaded into the FPGA directly or via an on-board EEPROM.