Intel Pentium M Processor Design Manual page 9

12.6 Length Tuning ................................................................................................................... 222
12.6.1 Signal to Strobe Flight Time Relationships .......................................................... 222
12.6.2 Flight Time Segment Analysis ............................................................................. 225
12.6.3 Length Tuning Equation Derivation .....................................................................226
12.6.4 Bus Length Tuning Methodology ......................................................................... 228
12.7 Processor Bus Tuning ......................................................................................................228
12.7.1 Compensating for Package Trace Length Differences ........................................ 228
12.7.2 Length Matching Equation ...................................................................................229
12.7.3 System Bus Length Matching Example ............................................................... 231
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12.8 Intel Pentium
12.9 Common Layout Pitfalls .................................................................................................... 233
12.9.1 Group Like Signals Under BGAs ......................................................................... 233
12.9.2 Fill Areas Under BGAs......................................................................................... 235
12.9.3 Signal Parallelism ................................................................................................ 236
12.9.4 Via Sharing .......................................................................................................... 237
12.9.5 Necking Down......................................................................................................239
12.9.6 Signals Crossing Plane Splits .............................................................................. 241
13 Schematic Checklist..................................................................................................................243
13.1 Processor Schematic Checklist ........................................................................................243
13.2 MCH Schematic Checklist ................................................................................................ 248
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13.3 Intel ICH3-S Schematic Checklist...................................................................................252
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13.4 Intel 82870P2 (Intel P64H2) Schematic Checklist .......................................................... 260
13.5 CK408 Schematic Checklist ............................................................................................. 265
14 Layout Checklist ........................................................................................................................ 267
14.1 Processor Checklist .......................................................................................................... 267
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14.2 Intel E7501 MCH Layout Checklist ................................................................................. 271
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14.3 Intel ICH3-S Layout Checklist......................................................................................... 275
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14.4 Intel P64H2 Layout Checklist..........................................................................................279
Design Guide
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Intel Pentium
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M Processor Signal Package Lengths.................................................... 232
M Processor and Intel
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E7501 Chipset Platform
Contents
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