64
Intel
®
855GME Chipset and Intel
®
6300ESB ICH Embedded Platform Design Guide
4.1.6
Pentium
®
M/Celeron
®
M Processor RESET# Signal
The RESET# signal is a common clock signal driven by the GMCH CPURESET# pin. In a
production system where no ITP700FLEX debug port is implemented, a simple point-to-point
connection between the CPURESET# pin of the GMCH and the Intel Pentium M/Celeron M
processor’s RESET# pin is recommended (see
). On-die termination of the AGTL+
buffers on both the processor and the GMCH provide proper signal quality for this connection.
This is the same case as for the other common clock signals listed
. Length L1 of this
interconnect shall be limited to minimum of 1 inch and maximum of 6.5 inches.
For a system that implements an ITP700FLEX debug port a more elaborate topology is required to
ensure proper signal quality at both the processor signal pad and the ITP700FLEX input receiver.
In this case the topology illustrated in
shall be implemented. The CPURESET# signal
from the GMCH shall fork out (do not route one trace from GMCH pin and then T-split) towards
the processor’s RESET# pin as well as toward the Rtt and Rs resistive termination network placed
next to the ITP700FLEX debug port connector. Rtt (220
Ω
+ 5 percent) pulls-up to the VCCP
voltage and is placed at the end of the L2 line that is limited to a 6-inch maximum length.
Rs (22.6
Ω
± 1 percent) must be placed right next to Rtt to minimize routing between them in the
vicinity of the ITP700FLEX connector to limit the L3 length to less than 0.5 inches. ITP700FLEX
operation requires the matching of L2 + L3 - L1 length to the length of the BPM[4:0]# signals
length within ± 50 ps. See
for more details on ITP700FLEX signal routing and
for more details on signal propagation time to distance correlation. See
routing length summary and termination resistor values.
Figure 22. Voltage Translation Circuit
1.3 K
Ω
±5%
3.3 V
To Receiver
From Driver
3904
3904
Q1
Q2
3.3 V
Rs
R1
R2
330
Ω
±5%
330
Ω
±5%
Figure 23. Processor RESET# Signal Routing Topology With NO ITP700FLEX Connector
CPU
L1
GMCH
Содержание 6300ESB ICH
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Страница 36: ...36 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide General Design Considerations...
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Страница 152: ...152 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide System Memory Design Guidelines DDR SDRAM...
Страница 172: ...172 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Integrated Graphics Display Port...
Страница 190: ...190 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Hub Interface...
Страница 246: ...246 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Intel 6300ESB Design Guidelines...
Страница 264: ...264 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Platform Clock Routing Guidelines...
Страница 298: ...298 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Schematic Checklist Summary...
Страница 318: ...318 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Layout Checklist...