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®
Intel
855GME Chipset and Intel
®
Intel
6300ESB Design Guidelines
9.10
PCI-X Design Guidelines
This section contains guidelines for connecting and routing the 6300ESB PCI-X interface. The
6300ESB supports up to four PCI-X devices. This section provides guidelines for PCI-X connector
and motherboard design, including component and resistor placement. When considering PCI-X
device configurations refer to
the 6300ESB PCI-X Interface.
Table 94.
PCI-X Slot/Device Configurations
PCI-X 1.0 Segment Configurations
6 loads, 3 pairs REQ/GNT
5 loads, 3 pairs REQ/GNT
6 loads, 4 pairs REQ/GNT
5 loads, 4 pairs REQ/GNT
4 loads, 4 pairs REQ/GNT
Note: Bounded by six electrical loads and four REQ/GNT pairs (1 slot = 2 electrical loads)
Note: These routing guidelines are created using the stack-up described in
Stack-Up" on page
The PCI-X interface may be routed with 5 mils traces on 12 mils spaces (dependent upon stackup
parameters), and must be less than eight inches long (from 6300ESB to PCI-X connector). Trace
spacing of 5 mils is only acceptable when necessary to route through pin fields. For more
information, refer to the PCI-X Specification, Rev 1.0 .
Table 95.
PCI-X Routing Summary
Trace
Impedance
55 Ω ± 10%
Table 96.
PCI-X Frequencies
Frequency
66 MHz
228
®
6300ESB ICH Embedded Platform Design Guide
Table 94
which shows all the slot/device-down options possible with
33.
Maximum Trace
PCI-X Routing
Length (To first
Requirements
connector)
5 mils width, 12
mils spacing
(based on
8 inches
stackup
assumptions in
Section
3.1)
Max Slots
Voltage
3
# of Slots
3
2
2
1
0
Maximum Trace
Length Between
Connectors
1.5 inches
3.3 V
# of Devices Down
0
1
2
3
4
Section 3.1, "Nominal Board
Clock
PCI-X Signal
Signal
Length Matching
Spacing
Clocks coming
from the clock
50 mils
driver must be
length matched.
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