Design Guide
143
I/O Controller Hub
9.7.3.3
Intel
®
82562ET/EM Termination Resistors
The 100
Ω
± 1% resistor used to terminate the differential transmit pairs (TDP/TDN), and the
121
Ω
± 1% resistor used to terminate the differential receive pairs (RDP/RDN) should be placed
as close to the Platform LAN connect component (82562ET or 82562EM) as possible. This is due
to the fact that these resistors are terminating the entire impedance that is seen at the termination
source (i.e., 82562ET), including the wire impedance reflected through the transformer.
9.7.4
Critical Dimensions
There are two dimensions to consider during layout. Distance 'A' from the line RJ45 connector to
the magnetics module, and distance 'B' from the 82562ET or 82562EM to the magnetics module.
The combined total distances A and B must not exceed 2 inches. (See
Figure 9-19. Intel
®
82562ET/EM Termination
Intel
®
82562ET
M agnetics
m odule
RJ45
Place term ination resistors as
close as possible to 82562ET .
LAN Connect
Interface
Figure 9-20. Critical Dimensions for Component Placement
Intel
®
82562ET
Intel
®
ICH3-S
EEPRO M
Magnetics
Module
Line
RJ45
B < 1"
A < 1"
Содержание Xeon
Страница 24: ...Introduction 24 Design Guide This page is intentionally left blank ...
Страница 30: ...Component Quadrant Layout 30 Design Guide This page is intentionally left blank ...
Страница 34: ...Platform Stack Up and Component Placement Overview 34 Design Guide This page is intentionally left blank ...
Страница 52: ...Platform Clock Routing Guidelines 52 Design Guide This page is intentionally left blank ...
Страница 66: ...System Bus Routing Guidelines 66 Design Guide This page is intentionally left blank ...
Страница 118: ...Intel 82870P2 P64H2 118 Design Guide This page is intentionally left blank ...
Страница 146: ...I O Controller Hub 146 Design Guide This page is intentionally left blank ...
Страница 148: ...Debug Port 148 Design Guide This page is intentionally left blank ...
Страница 210: ...Schematic Checklist 210 Design Guide This page is intentionally left blank ...
Страница 220: ...Layout Checklist 220 Design Guide This page is intentionally left blank ...
Страница 222: ...Schematics 222 Design Guide This page is intentionally left blank ...