84
Intel
®
855GME Chipset and Intel
®
6300ESB ICH Embedded Platform Design Guide
4.3.2
Recommended ITP Interposer Debug Port Implementation
Intel is working with American Arium* to provide ITP interposer cards for use in debugging Intel
Pentium M/Celeron M processor-based systems as an alternative to the onboard ITP700FLEX in
cases where the onboard connector cannot be supported. The ITP interposer card is an additional
component that integrates a Intel Pentium M/Celeron M processor socket along with ITP700
connector on a single interposer card that is compatible with the 478-pin Intel Pentium M/Celeron
M processor socket.
summarizes all the signals that require termination for a system designed for use with the
ITP interposer. This includes TDI, TMS, TRST#, and TCK. TDO may be left as a no connect.
DBR# should be routed to the system reset logic (e.g., the SYSRST# signal of the 6300ESB) and
initiate the equivalent of a front panel reset commonly found in desktop systems. The 150
Ω
to
240
Ω
pull-up resistor should be placed within 1 ns of the ITP connector.
Note:
The processor should not be power cycled when DBR# is asserted.
DBA# is an optional system signal that may be used to indicate to the system that the ITP/TAP port
is being used. When not implemented, this signal may be left as no connect. When implemented, it
shall be routed with a 150
Ω
to 240
Ω
pull-up resistor placed within 1 ns of the ITP connector.
4.3.2.1
ITP_CLK Routing to ITP Interposer
A layout example for ITP_CLK/ITP_CLK# routing to the CPU socket for supporting an ITP
interposer is shown in
. The CK409 clock chip is mounted on the primary side layer of
the motherboard and the differential clock pair also breaks out on the same side. The differential
ITP clock pair routing also requires a pair of 33
Ω
± 5 percent series resistors placed within 0.5
inches of the clock chip output pins and followed by a pair of 49.9
Ω
± 1 percent termination
resistors to ground. The majority of the ITP_CLK differential serpentine routing takes place on
internal Layer 6 below the Intel Pentium M/Celeron M processor FSB address signal routing.
Completion of ITP+CLK routing on Layer 6 is not possible due to Intel Pentium M/Celeron M
processor FSB routing on Layer 6. Therefore the ITP_CLK differential pair then is routed to the
secondary side layer to complete routing to the ITP_CLK (pin A16) and ITP_CLK# (pin A15) pins
of the Intel Pentium M/Celeron M processor while matching the BCLK[1:0] routing on the
secondary side for a 507 mil length (see
and description in
). Routing to the
CPU socket on the primary side layer is not possible because of the presence of the VCCA 1.8 V or
1.5 V plane flood along the A-signal side row of the pin-map. ITP_CLK routing to the ITP
interposer should achieve the ± 50 ps length matching requirement of the BCLK[1:0] lines.
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...