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Design Guide 37
Intel
®
31244 PCI-X to Serial ATA Controller
Printed Circuit Board (PCB) Methodology
Printed Circuit Board (PCB)
Methodology 6
This section provides a recommended guidelines for PCB stackup. A considerable part of the SI
analysis, is to identify and recommend the backplane stackup recommendations. This guideline
section is separated into two recommendations:
• GD31244 in normal mode, refer to Table 9.
• GD31244 in extended voltage mode for backplane designs, refer to Table 10.
The specified impedance range for SATA is differential 100 +
15% ohms for all components of the
SATA path:
Table 11 defines the starting point for possible stackups.
The assumption is that GD31244 is implemented with normal 60 ohm guidelines, with the primary
application being standard desktop PC.
• backplane • cables
• motherboard • connectors