Intel® 31244 PCI-X to Serial ATA Controller
Printed Circuit Board (PCB) Methodology
Printed Circuit Board (PCB)
Methodology6
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:
• | backplane | • | cables |
• | motherboard | • | connectors |
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.
Design Guide | 37 |