Filter
Top Products
Design Guide 53
Intel
®
31244 PCI-X to Serial ATA Controller
PCI-X Layout Guidelines
7.4.4 Embedded Intel
®
31244 PCI-X to Serial ATA Controller
Single PCI-X Load
Figure 18 shows GD31244 as the PCI-X agent in a standalone embedded application (with no
PCI-X slot). This figure shows one of the chipset PCI AD lines connected through W1 to the Intel
®
31244 PCI-X to Serial ATA Controller. This AD line is also used as an IDSEL line from line
segment W2 to a 2 K resistor through W3 to the GD31244 IDSEL line input buffer. Table 23 shows
the corresponding wiring rules. These recommended wire lengths should support all PCI-X
frequencies. However, prelayout simulation is recommended.
Figure 18. Embedded Intel
®
31244 PCI-X to Serial ATA Controller
Design with Single PCI-X Load
Table 23. Wiring Lengths for Embedded Intel
®
31244 PCI-X to Serial ATA Controller
with Single PCI-X Load
Segment
Lower AD Bus Upper AD Bus
Units
Minimum Length Maximum Length Minimum Length Maximum Length
W1 2.85 10 3.85 10.25 inches
W2 0.1 0.2 N/A N/A inches
W3 1.125 1.725 N/A N/A inches
B0477-01
W1
I/O Buffer
PCI
Agent
W2
IDSEL
W3