IXP28XX Network Processor
Contents
22 QDR SRAM Connections ........................................................................................................... 57
27 QDR Address Signals - Balanced T-Topology ......................................................................... 66
28 QDR Address Routing - T-Topology with Daisy-Chain Branches ............................................ 66
30 D (Data Out) Routing Topology .................................................................................................. 68
32 Q (Data In) Routing Topology..................................................................................................... 70
42 QDR SRAM VREF Generation ................................................................................................... 80
43 Resistive QDR VREF Divider Example ...................................................................................... 80
44 Voltage QDR VREF Divider Example for Each QDR Channel ................................................... 81
47 QDR SRAM Routing Recommendations .................................................................................... 84
49 Example Interconnects on the IXP28XX Network Processor, with a Two-QDRII SRAM Load
per Channel ................................................................................................................................ 86
54 TCAM and QDR SRAM Placement ............................................................................................ 91
55 Routing Recommendations for QDR SRAM and TCAM Routing ............................................... 92
63 PCI Subsystem ......................................................................................................................... 112
66 Address/Data Signals with IDSEL Topology (Showing Only the Ingress
Intel® IXP28XX Network Processor) ........................................................................................ 115
68 SPCI Clock Signals Topology................................................................................................... 117
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