Xilinx RocketIO X User Manual

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Xilinx RocketIO X User Manual Manual pdf 171 page image

RocketIO™ X Transceiver User Guide www.xilinx.com 171UG035 (v1.5) November 22, 2004 1-800-255-7778Power Regulation and Filtering RPower Regulation and FilteringAs with Virtex-II Pro FPGAs, each Virtex-II Pro X transceiver has five power supply pins, all ofwhich are sensitive to noise. Table D-4 summarizes the Virtex-II Pro X power supply pins(relative to Virtex-II Pro), including their names, associated voltages, and power requirements.To operate properly, RocketIO and RocketIO X transceivers require a certain level of noiseisolation from surrounding noise sources. For this reason, it is required that both dedicatedvoltage regulators and passive high-frequency filtering be used to power RocketIO andRocketIO X circuitry. Voltage regulation requirements for Virtex-II Pro X FPGAs areidentical to Virtex-II Pro FPGAs. Two Linear Technology LT1963 regulator circuits areneeded to generate the required 1.5V and 2.5V supplies. For more information, see thevoltage regulation sections of this guide and the RocketIO Transceiver User Guide (UG024).Figure D-2 shows the power filtering network for one transceiver. Each transceiver power pinrequires one ferrite bead. The ferrite bead is the Murata BLM18AG102SN1.Note: These components must not be shared under any circumstances.Table D-4: Voltage Changes for Virtex-II Pro X FPGA Power RegulationVirtex-II Pro Virtex-II Pro X (1)Supply Voltage Supply Voltage Power2.5 Gb/s (mW)Power5.0 Gb/s (mW)Power (2)10 Gb/s (mW)AVCCAUXTX 2.5V AVCCAUXTX 2.5V TBD TBD 125AVCCAUXRX 2.5V AVCCAUXRX 1.5V TBD TBD 141VTTX 1.8V–2.625V VTTX 1.5V TBD TBD 108(3)VTRX 1.8V–2.625V VTRX 0.25–2.5V TBD TBD 12 (4)GNDA 0V GNDA 0V TBD TBD N/ANotes:1. Power listed is the estimated power per MGT for the individual supply over all MGT operating modes. The total power per MGT is modespecific and less than the sum total of these values.2. Power figures shown do not include power requirements of VCC (82 mW) and VCCAUX (140 mW), which power the PCS and PMA, respectively.3. Dependent on mode, voltage level, swing, and emphasis settings.4. Dependent on termination style, voltage level, and swing. For 100Ω differential termination, VTRX is unconnected (0 mW). Refer to Figure 4-28.Figure D-2: Power Filtering Network for One Transceiverug035_ch4_16_111103BLM18AG102SN1BLM18AG102SN1BLM18AG102SN1BLM18AG102SN1AVCCAUXRXAVCCAUXTXVTTXVTRXGNDA1.5V1.5VVTR2.5V