Virtex-4 RocketIO MGT User Guide www.xilinx.com 329UG076 (v4.1) November 2, 2008Other Minor DifferencesROther Minor DifferencesTerminationIn Virtex-II Pro and Virtex-II Pro X devices, the transceivers contained on-chip terminationand reference voltages for V TTX and V TRX . In Virtex-4 devices, the MGTs use a referenceresistor to create the termination circuitry for each MGT column. These new package pinsare RTERM and MGTVREF (see Chapter 6, “Analog and Board Design Considerations” formore details). Table E-6 shows the termination options for each generation.Figure E-2: Virtex-II, Virtex-II Pro, and Virtex-4 Power Supply FilteringMPZ1608S221A.MPZ1608S221A.MPZ1608S221A.MPZ1608S221A.AVCCAUXRXAVCCAUXTXVTTXVTRXGNDA1.5V1.5VV TR2.5VVirtex-II Pro X Power Supply FilteringVirtex-II Pro Power Supply FilteringVirtex-4 Power Supply Filteringug076_apD_02_0719071.2V1.5V2.5VVTTXAVTTXBVTRXAVTRXBAVCCAUXTXAVCCAUXRXAAVCCAUXMGTRTERMAVCCAUXRXBGNDAMGTVREFNotes:1. Capacitors are 0402 0.22 mF.2. Ferrite Beads are MPZ1608S221A.3. There are multiple GNDA per Tile.4. RTERM and MGTVREF can always be left floatingfor commercial-grade and industrial-grade parts.1.5V Typical (0 - 2.5V)2.5 VAVCCAUXTXAVCCAUXRXVTTXVTRXVTTVTR2.5 VAVCCAUXTXAVCCAUXRXVTTXVTRXVTTVTRDevice With In-Package Capacitors Device Without In-Package CapacitorsGNDAGNDAXX
