Virtex-4 RocketIO MGT User Guide www.xilinx.com 325UG076 (v4.1) November 2, 2008RAppendix EVirtex-II Pro/Virtex-II Pro X to Virtex-4RocketIO Transceiver Design MigrationIntroductionThis appendix describes important differences regarding migration from theVirtex®-II Pro/Virtex-II Pro X to the Virtex-4 RocketIO™ Multi-Gigabit Transceivers(MGTs). This appendix does not describe all of the features and capabilities of thesedevices, but only highlights relevant PCB, power supply, and reference clock differences.For more information on Virtex-II Pro and Virtex-II Pro X FPGAs, refer to DS083,Virtex-II Pro Data Sheet; RocketIO Transceiver User Guide; and RocketIO X Transceiver UserGuide.Primary DifferencesVirtex-4 FPGAs are a different family from the Virtex-II Pro/Virtex-II Pro X family. TheVirtex-4 FPGAs are not pin compatible. However, many aspects of the MGTs between thefamilies are the same. The primary differences between Virtex-II Pro/Virtex-II Pro XFPGAs are:• MGTs per device• Clocking – Naming conventions and actual topography• Serial rates – supporting 0.622 Gb/s to 6.5 Gb/s I/O• Encoding standards – 8B/10B, SONET, and others• Clock multipliers – X10, 16, 20, 32, 40• Flexibility – partial reconfiguration, PMA programming bus, DynamicReconfiguration Port• Board guidelinesMGTs per DeviceVirtex-4 FPGAs allow for a large range of MGTs per device. Table E-1 shows the number ofMGTs available for each family.Table E-1: MGTs per DeviceVirtex-II Pro 4, 8, 12, 16, 20Virtex-II Pro X 8, 20Virtex-4 8, 12, 16, 20, 24
