
IBM32NPCXX1EPABBE66
Preliminary
IBM Processor for Network Resources
pnr261TOC.fm.06
August 14, 2000
Page vii
3.12.17.13 LCD Cache LCD Address Registers .......................................................................277
3.12.17.14 LCD Cache State Machine Variables Register .......................................................278
3.12.17.15 LCD Cache LRU State Register ..............................................................................279
3.13 Transmit Buffer Segmentation (SEGBF) ..................................................................................281
3.13.1 SEGBF Software LCD Enqueue .........................................................................................283
3.13.2 SEGBF Control Register ....................................................................................................284
3.13.3 SEGBF Status Register ......................................................................................................286
3.13.4 SEGBF Invalid LCD Register .............................................................................................287
3.13.5 SEGBF Software LCD Complete ........................................................................................288
3.13.6 SEGBF Interrupt Enable Register ......................................................................................289
3.13.7 SEGBF Programmable Counters .......................................................................................290
3.13.8 SEGBF Transmit LCD Size ................................................................................................291
3.13.9 SEGBF Cell Queue Status .................................................................................................292
3.13.10 SEGBF Processor 1 Control/Status .................................................................................293
3.13.11 SEGBF Processor 2 Control/Status .................................................................................294
3.13.12 SEGBF Programmable Counter Source Specification .....................................................295
3.13.13 SEGBF Cell Staging Array Pointer ...................................................................................297
3.13.14 SEGBF Cell Staging Array Data .......................................................................................297
3.13.15 SEGBF Instruction SRAM Pointer ....................................................................................298
3.13.16 SEGBF Instruction SRAM Data ........................................................................................299
3.13.17 SEGBF MPEG-2 PCR Increment Register .......................................................................299
3.14 Cell/Packet Reassembly (REASM) ............................................................................................301
3.14.1 Miscellaneous Reassembly Functions ...............................................................................303
3.14.1.1 ATM OAM Cell Processing ..........................................................................................303
3.14.1.2 TCP/IP Receive Checksum Verification ......................................................................304
3.14.1.3 Scatter/Cut Through Receive Processing ...................................................................304
3.14.2 REASM ...............................................................................................................................309
3.14.2.1 REASM Logical Channel Descriptor Base Register ....................................................309
3.14.2.2 REASM Mode Register ...............................................................................................310
3.14.2.3 REASM Reassembly Modes Register .........................................................................311
3.14.2.4 REASM Status Register ..............................................................................................312
3.14.2.5 REASM Interrupt Enable Register ...............................................................................313
3.14.2.6 REASM DEBUG State Selector Register ....................................................................313
3.14.3 RXBUF ...............................................................................................................................314
3.14.3.1 RXBUF Functional Description ....................................................................................314
3.14.3.2 RXBUF Cell Data Buffer Address ................................................................................315
3.14.3.3 RXBUF Cell Data Buffer Read/Write Port ...................................................................315
3.14.3.4 RXBUF Cell Info Buffer Address .................................................................................316
3.14.3.5 RXBUF Cell Info Buffer Read/Write Port .....................................................................317
3.14.3.6 RXBUF Receive Buffer Threshold ...............................................................................317
3.14.4 RXXLT ................................................................................................................................318
3.14.4.1 RXXLT Functional Description ....................................................................................318
3.14.4.2 RXXLT Register Array Address Port ...........................................................................322
3.14.4.3 RXXLT Register Array Read/Write Port ......................................................................322
3.14.4.4 RXXLT Processor State Selector ................................................................................323
3.14.4.5 RXXLT Processor State Read/Write Port ....................................................................323
3.14.4.6 RXXLT Instruction Array Address Port ........................................................................324
3.14.4.7 RXXLT Instruction Array Read/Write Port ...................................................................324
3.14.4.8 RXXLT Last LCD Index Register .................................................................................325