Figure 4-22: Power Filtering Network For One Transceiver - Xilinx RocketIO X User Manual

R
Each transceiver power pin requires one ferrite bead. Like the Virtex-II Pro MGT flip chip
devices, all Virtex-II Pro X MGTs contain power-filtering capacitors in the package to
reduce component count on the PCB, as well as improve the effectiveness of these
capacitors. The value of this internal capacitor is 0.22 µF. The ferrite bead is the Murata
BLM 18AG102SN1 and must be used as shown in
be shared among multiple RocketIO power supply pins under any circumstances.
Figure 4-23
A/B) and four on the bottom edge (rows AE/AF).
with lands for the ferrite beads of all supplies: AVCCAUXTX, AVCCAUXRX, VTTX, and
116
1.5V
BLM18AG102SN1
2.5V
BLM18AG102SN1
1.5V
BLM18AG102SN1
V
TR
BLM18AG102SN1

Figure 4-22: Power Filtering Network for One Transceiver

shows an example with eight transceivers total–four on the top edge (rows
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Chapter 4: Analog Design Considerations
AVCCAUXRX
AVCCAUXTX
VTTX
VTRX
GNDA
ug035_ch4_16_111103
Figure 4-22. These components may not
Figure 4-23 shows the bottom PCB layer,
RocketIO™ X Transceiver User Guide
UG035 (v1.5) November 22, 2004