Xilinx RocketIO User Manual page 112

Product Not Recommended for New Designs
R
cases, as ferrite beads are not included inside the package in any device. Table boxes
labeled "External" denote a device for which the user must provide power filtering
capacitors externally on the PCB; those labeled "Internal" denote a device that contains all
necessary 0.22 μF capacitors for RocketIO power pins. Table boxes that say "No MGTs"
denote a device that does not have any RocketIO transceivers.
Table 3-7: Device and Package Combinations showing Devices with RocketIO Power Filtering Capacitors
Internal to the Package and Externally Mounted on the PCB
XC2VP2 XC2VP4
FG256 External External
FG456 External External
FF672 Internal Internal
FG676
FF896
FF1152
FF1148
FF1517
FF1704
FF1696
For devices that do not contain filtering capacitors in their package, the 0.22 μF capacitors
must be placed within 1 cm of the pins they are connected to.
Figure
network for four transceivers (in one case in a package with internal capacitors, in another
case in a package with external capacitors).
The device in
the top edge (rows A/B), and four on the bottom edge (rows AE/AF). This device contains
internal capacitors, so it is only necessary to have ferrite beads on the PCB.
shows the bottom PCB layer, with lands for ferrite beads of the VTTX, VTRX,
112
XC2VP7 XC2VP20 XC2VP30
External
Internal
External
Internal Internal
Internal
3-9, Figure 3-10, and Figure 3-11
Figure 3-9 is in an FF672 package, which has eight transceivers total—four on
www.xilinx.com
Chapter 3: Analog Design Considerations
XC2VP40 XC2VP50
External External
Internal
Internal Internal Internal
No MGTs No MGTs
Internal Internal
show example layouts of the power filtering
RocketIO™ Transceiver User Guide
XC2VP70 XC2VP100
Internal
Internal Internal
No MGTs
Figure 3-9
UG024 (v3.0) February 22, 2007