Intel EP80579 Manual page 276

Table 97. Layout Checklist (Sheet 8 of 13)
Signal Name
SATA_CLKREFp,
SATA_CLKREFn
SATALED#
SATA0GP (GP26_SATA0GP) See General Purpose I/O (GPIO) Interface
SATA1GP (GP29_SATA1GP) See General Purpose I/O (GPIO) Interface
USBp[1:0],
USBn[1:0]
OC[1:0]#
USB_RBIASp
USB_RBIASn
CLK48
PLTRST#
PROCHOT#
®
Intel EP80579 Integrated Processor Product Line
Platform Design Guide
276
®
Intel EP80579 Integrated Processor Product Line—Layout Checklist
Trace Geometry and
Impedance
Zdiff = 100 Ω +/- 10%
Trace Width:
Brakeout Trace Width 4 mils
Microstrip: 4 mils
Stripline: 3.75 mils (L3/L8)
Airgap Spacing:
Brakeout spacing Min=4mils
Microstrip: 6 mils
Stripline: 9 mils
Spacing between Pairs 20mils
Spacing to other signals 20 mils
Serpentine Spacing 20 mils
Ω
Zo = 50 +/- 10%
Universal Serial Bus (USB) Interface
Ω
Zdiff = 90 +/- 10%
Trace Width:
Brakeout Trace Width 4 mils
Microstrip: 4.75 mils
Stripline: 4.5 mils
Airgap Spacing:
Brakeout spacing Min=4mils
Microstrip: 5.25 mils
Stripline: 5.5 mils
Spacing between Pairs
Min = 45mils
Spacing to clock signals
Min = 45mils
Spacing to non clock signals
Min = 45mils
Ω
Zo = 50 +/- 10%
Ω
Zo = 50 +/- 10%
Ω
Zo = 50 +/- 10%
Trace Width
Microstrip: 5.5 mils
Stripline: 4.5 mils (L3)
Airgap Spacing:
Spacing to other signals
Min = 20mils
Spacing to non clock signals
Min = 45mils
Power Management Interface
Ω
Zo = 50 +/- 10%
Ω
Zo = 50 +/- 10%
Length Requirements
Routing Length LT:
Min = 1 in. See
Clock)
Max = 16 in.
2 Vias Max
Inter-pair length
matching: +/- 5 mils
Breakout:
See
Max = 400mils.
Differential Signals – USBp[1:0],
Board Length:
USBn[1:0]".
Microstrip 2-11 in.
Strip Line 2-10 in.
Keep all traces as short as
possible. Choke must be placed
Inter-pair length
as close as possible to the
matching
connector.
Max = 60 mils skew
• See
• See
Length LT:
Max = 0.5 in. • Place the 22.6 Ω resistor
Length LT:
Place damping resistor as close
as possible to the source.
2 to 20 in
Comments
Section 8.2.2, "CLK100 (SRC
Group".
Section 12.2.2, "USB
Section 12.2.5, "USB
Over Current protection –
OC[1:0]#".
Section 12.2.3,
"USB_RBIASp/USB_RBIASn
Connection".
within 0.5 in. of the
EP80579.
May 2010
Order Number: 320068-005US