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38 Design Guide
Intel
®
31244 PCI-X to Serial ATA Controller
Printed Circuit Board (PCB) Methodology
6.1 Intel
®
31244 PCI-X to Serial ATA Controller
Normal Mode (standard SATA driver)
This section provides recommendations for the GD31244 running in the standard SATA mode.
Figure 11 shows a standard SATA setup with the GD31244 connected to trace on the motherboard.
This trace terminates with a connector. The SATA cable connects to the SATA motherboard cable
with the other end connecting to connector on the hard drive. The traces from the SATA hard drive
connector connect to the SATA interface IC on the hard drive.
Figure 11. Intel
®
31244 PCI-X to Serial ATA Controller Connection Scheme - Normal Mode
Table 11. Normal Voltage Mode
Parameter Routing Guideline
Single Ended Trace Impedance Microstrip stackup
Reference Plane ground
Impedance 100 ohms differential impedance
Trace Thickness 1.4 mil
Trace Width 5 mil
Intra Pair Trace Spacing 7 mil
Pair to Pair
Trace Spacing
20 mil minimum
Trace Length 2” to 5”
Trace Length Matching 100 mils
Cable Length 1 meter
Hard drive PCB Length from connector to SATA
interface IC.
1”
Vias
Minimize number of vias (none preferred). Each
channel in the pair has an equal number of vias.
B0423-02
Cable
Conn.
HD
Traces
Conn.
MB
Traces
Intel
®
31244
SATA IC