82583V Datasheet, PDF (364/374 Pages) Intel Corporation – Intel® 82583V GbE Controller

82583V GbE Controller—Board Layout and Schematic Checklists
14.0 Board Layout and Schematic Checklists
Table 63. Board Layout Checklist
Section
Check Item
Remarks
General
Placement of
the 82583V
PCIe
Interface
Clock Source
(Crystal
Option)
Obtain the most recent documentation
and specification updates.
Route the transmit and receive differential
traces before routing the digital traces.
Place the 82583V at least one inch from
the edge of the board.
Place the 82583V at least one inch from
the integrated magnetics module but less
than four inches.
Place the AC coupling capacitors on the
PCI Express* (PCIe*) Tx traces as close as
possible to the 82583V but not further
than 250 mils.
Place the AC coupling capacitors on the
PCIe Rx traces as close as possible to the
upstream PCIe device but not further than
250 mils.
Make sure the trace impedance for the
PCIe differential pairs is 100 Ω +/- 20%.
Match trace lengths within each PCIe pair
on a segment-by-segment basis. Match
trace lengths within a pair to five mils.
Place crystal within 0.75 inches of the
82583V.
Place the crystal load capacitors within
0.09 inches of the crystal.
Keep clock lines away from other digital
traces (especially reset signals), I/O ports,
board edge, transformers and differential
pairs.
Documents are subject to frequent change.
Layout of differential traces is critical.
With closer spacing, fields can follow the surface of the
magnetics module or wrap past edge of the board. As a result,
EMI might increase. The optimum location is approximately
one inch behind the magnetics module.
Keep trace length under four inches from the 82583V through
the magnetics to the RJ-45 connector. Signal attenuation can
cause problems for traces longer than four inches. However,
due to near field EMI, the 82583V should be placed at least one
inch away from the magnetics module.
Size 0402, X7R is recommended. The AC coupling capacitors
should be placed near the transmitter for PCIe.
Size 0402, X7R is recommended. The AC coupling capacitors
should be placed near the transmitter for PCIe.
These traces should be routed differentially.
This reduces EMI.
This reduces EMI.
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