Pci Express Down Device With Lai Connector Routing (Ep80579 Transmit) - Intel EP80579 Manual

Figure 96.

PCI Express Down Device with LAI Connector Routing (EP80579 Transmit)

EP80579
Table 56 and
Device. In this case, EP80579 is a receiver and the PCI Express connector is a
transmitter. LT must be routed on the same layer.
• L1 starts from the EP80579 breakout region to the AC blocking capacitor via.
• L2 is the main routing section that is from the AC blocking capacitor via to the logic
analyzer connector.
• L3 and L4 are the logic analyzer connector breakout regions on each side of the
connector.
• L5 is from the logic analyzer connector breakout region to the PCI Express device
break-in region.
• L6 is the break-in region of the PCI Express device.
• LT is the main routing section that is from the EP80579 pin to the PCI Express
device.
Table 56. PCI Express Down Device with LAI Connector Routing (EP80579 Receive)
Signal Group
Reference Plane
Layer Assignment
Characteristic Trace Impedance (Zo)
Nominal Trace Width
Nominal Trace Spacing within a pair from
edge to edge
Nominal Trace Spacing from edge of one
differential pair to edge of another
differential pair
Trace Length L1, L1'– EP80579 Breakout
region and to AC CAP
®
Intel EP80579 Integrated Processor Product Line
Platform Design Guide
149
®
Intel EP80579 Integrated Processor Product Line—PCI Express* Interface
LT = L1 + L2 + L3 + L4 + L5 + L6
L1
AC CAP
L1'
AC CAP
summarize the layout routing solution space to a PCI Express
Figure 97
Parameter
PEA0_Rn[7:0], PEA0_Rp[7:0]
Ground Referenced
Layers 3 or 8 (stripline)
Layers 1 or 10 (microstrip)
90 Ω ±10% (Differential)
4.5 mils (stripline)
4.75 mils (microstrip)
5.5 mils (stripline)
5.25 mils (microstrip)
The greater of:
Min = 0.75 in.
Max = 2.5 in.
LAI
Connector
L2 L3 L4 L5
LAI
Connector
L2' L3' L4' L5'
Routing Guidelines
• 18 mils or 3x dielectric thickness (stripline)
• 20 mils or 3x dielectric thickness
(microstrip)
PCI
L6
Express*
Device
L6'
Figure
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Figure 87
Figure 88
Figure 87
Figure 88
Figure 87
Figure 88
Figure 97
May 2010
Order Number: 320068-005US