38
Intel
®
855GME Chipset and Intel
®
6300ESB ICH Embedded Platform Design Guide
Intel
®
Pentium
®
M/Celeron
®
M Processor FSB Design and Power Delivery Guidelines
effects of crosstalk are difficult to simulate. The timing and layout guidelines for the Intel Pentium
M/Celeron M Processor have been created with the assumption of a 2:1 trace spacing to reference
plane ratio. A smaller ratio has an unpredictable impact due to crosstalk.
4.1.1.2
Trace Space to Trace Width Ratio
illustrates the recommended relationship between the edge-to-edge trace spacing versus
trace width ratio for the best signal quality results. In general, a 3:1 trace space-to-trace width ratio
(shown in
) is preferred and highly recommended. In case of routing difficulties on the
motherboard, using a 2:1 ratio (shown in
) would be acceptable only if additional
simulations conclude that it is possible, which may include some changes to the stack-up or routing
assumptions.
4.1.1.3
Recommended Stack-up Calculated Coupling Model
The importance of maintaining an adequate trace space to trace width ratio is to achieve the best
signal quality possible given routing constraints. The simulations performed that resulted in the
recommended 3:1 trace spacing to trace width ratio are to keep the coupling between adjacent
traces below a maximum value. For the recommended stack-up, the constants shown in
are assumed to be constant for a typical stack-up. This means the mutual to self-coupling
Figure 3. Trace Spacing versus Trace to Reference Plane Example
R e fe r e n c e P la n e ( V S S )
T r a c e
T r a c e
X
2 X
Figure 4. Two-to-One Trace Spacing-to-Trace Width Example
Figure 5. Three-to-One Trace Spacing-to-Trace Width Example
Trace
Trace
2X
X
Trace
Trace
3X
X
Содержание 6300ESB ICH
Страница 24: ...24 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Introduction...
Страница 36: ...36 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide General Design Considerations...
Страница 102: ...102 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide...
Страница 122: ...122 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide...
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...