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IXP28XX Network Processor
Contents
3
Contents
1 Introduction .................................................................................................................................... 11
1.1 System Overview ................................................................................................................ 11
1.2 In This Guide ...................................................................................................................... 13
1.2.1
Typographical Conventions ................................................................................... 14
1.2.2 Acronyms and Terminology ................................................................................... 14
1.3 Related Documentation ......................................................................................................16
1.4 Contacting Intel® ................................................................................................................ 16
2 Power Ratings and Requirements ................................................................................................. 17
2.1 Power Ratings .................................................................................................................... 17
2.2 Supply Voltage Power-up Sequence ..................................................................................24
2.2.1
Sequence for 1.4 / 1.0 GHz Devices .....................................................................24
2.2.2 Sequence for 650 MHz Devices ............................................................................24
2.2.3 Power Supply Regulation ...................................................................................... 25
2.2.3.1
Power-Up Power Supply Regulation...................................................... 25
2.2.3.2 Power Supply Decoupling...................................................................... 25
2.3 LC Filter Network ................................................................................................................ 26
2.4 IXDP2800 Advanced Development Platform Power Supply Subsystem ............................ 27
2.4.1
Subsystem Block Diagram..................................................................................... 27
2.4.2 Power-up Sequence .............................................................................................. 29
2.5 IXP28XX Network Processor Power-On di/dt Profiles ........................................................ 30
2.5.1
di/dt Droop Analysis Results ..................................................................................31
2.5.2 Recommendations From Droop Analysis .............................................................. 31
3 RDRAM ......................................................................................................................................... 33
3.1 IXMB2800 RDRAM Subsystem Design .............................................................................. 33
3.1.1
RDRAM Subsystem Implementation Options ........................................................ 34
3.2 Rambus* Channel Design .................................................................................................. 35
3.2.1
RSL Trace Requirements and Recommendations ................................................ 35
3.2.2 Unused Channel Guidelines ..................................................................................36
3.2.3 Crosstalk ................................................................................................................ 36
3.2.4 Third-party Sources ...............................................................................................36
3.2.5 IXP28XX Network Processor Power-Up Sequence............................................... 36
3.2.6 IXP28XX Network Processor Power-Up Considerations when using NexMod*
Memory Modules ................................................................................................... 37
3.3 IXP28XX Network Processor Rambus* Controller Footprint and Via Placement ............... 38
3.4 IXP28XX Network Processor Controller Escape Routing ................................................... 41
3.5 IXP28XX Network Processor Three-Channel Controller to HCD NexMod* RDRAM
Routing ............................................................................................................................... 46
3.6 IXP28XX Network Processor Short Channel Routing ........................................................ 49
3.7 Package Trace Lengths for RDRAM Signals...................................................................... 50
4 QDR SRAM ................................................................................................................................... 53
4.1 Introduction .........................................................................................................................53
4.2 QDR Clocking Scheme ....................................................................................................... 54
4.2.1
SRAM Controller Configurations............................................................................54
4.3 QDR SRAM Connections ................................................................................................... 57
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