
IBM3206K0424
Preliminary
IBM Processor for Network Resources
nrm.toc.01
August 14, 2000
Page 3
Contents
Features ..........................................................................................................................21
Description .....................................................................................................................21
Conventions ...................................................................................................................22
Standards Compliance ..................................................................................................23
Environmental Ratings ..................................................................................................24
Functional Description ..................................................................................................28
Subsystem Blocks ...............................................................................................................................29
External Architecture ...........................................................................................................................30
Internal Architecture ............................................................................................................................31
Logical Channel Support .................................................................................................................31
Virtual Memory Support ...................................................................................................................31
Queues ............................................................................................................................................32
Scheduling .......................................................................................................................................32
System Environment ...........................................................................................................................34
Data Flows ......................................................................................................................36
Transmit Path .......................................................................................................................................37
Receive Path .........................................................................................................................................39
Input/Output Definitions ................................................................................................41
DRAM Memory Bus Interface ..............................................................................................................41
DRAM Memory Bus Interface ..............................................................................................................44
NPBUS ...................................................................................................................................................48
ATM PHY Bus Interface .......................................................................................................................51
Data Structures ..............................................................................................................61
Packet Header ......................................................................................................................................61
Transmit Logical Channel Descriptor Data Structures ....................................................................66
Field Definitions ...............................................................................................................................74
Receive LCD Data Structure and Modes ........................................................................................78
Raw LCD .........................................................................................................................................80
Raw Routed LCD .............................................................................................................................81
Raw Routed Early Drop LCD ...........................................................................................................82
Raw Scatter/Cut-Through LCD ........................................................................................................83
AAL5 LCD ........................................................................................................................................84
AAL5 Routed LCD ...........................................................................................................................85
AAL5 Cut-Through/Scatter Mode LCD ............................................................................................86
Packet LCD .....................................................................................................................................87
Packet Routed LCD .........................................................................................................................88
Packet Cut-Through Scatter Mode LCD ..........................................................................................89
Field Definitions ...............................................................................................................................90