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42 Hardware Reference Manual
Intel
®
IXP2800 Network Processor
Technical Description
2.3.5.2 Absolute Addressing Mode
With Absolute addressing, any GPR can be read or written by any of the eight Contexts in a
Microengine. Absolute addressing enables register data to be shared among all of the Contexts,
e.g., for global variables or for parameter passing. All 256 GPRs can be read by Absolute address.
2.3.5.3 Indexed Addressing Mode
With Indexed addressing, any Transfer or Next Neighbor register can be read or written by any one
of the eight Contexts in a Microengine. Indexed addressing enables register data to be shared
among all of the Contexts. For indexed addressing the register number comes from the T_INDEX
register for Transfer registers or NN_PUT and NN_GET registers (for Next Neighbor registers).
Example 9 shows the Index Mode usage. Assume that the numbered bytes have been moved into
the S_TRANSFER_IN registers as shown.
If the software wants to access a specific byte that is known at compile-time, it will normally use
context-relative addressing. For example to access the word in transfer register 3:
If the location of the data is found at run-time, indexed mode can be used, e.g., if the start of an
encapsulated header depends on an outer header value (the outer header byte is in a fixed location).
Example 9. Use of Indexed Addressing Mode
Transfer
Register
Number
Data
31:24 23:16 15:8 7:0
0 0x00 0x01 0x02 0x03
1 0x04 0x05 0x06 0x07
2 0x08 0x09 0x0a 0x0b
3 0x0c 0x0d 0x0e 0x0f
4 0x10 0x11 0x12 0x013
5 0x14 0x15 0x16 0x17
6 0x18 0x19 0x1a 0x1b
7 0x1c 0x1d 0x1e 0x1f
alu[dest, --, B, $xfer3] ; move the data from s_transfer 3 to gpr dest
; Check byte 2 of transfer 0
; If value==5 header starts on byte 0x9, else byte 0x14
br=byte[$0, 2, 0x5, L1#], defer_[1]
local_csr_wr[t_index_byte_index, 0x09]
local_csr_wr[t_index_byte_index, 0x14]
nop ; wait for index registers to be loaded
L1#:
; Move bytes right justified into destination registers
nop ; wait for index registers to be loaded
nop ;
byte_align_be[dest1, *$index++]
byte_align_be[dest2, *$index++] ;etc.
; The t_index and byte_index registers are loaded by the same instruction.
- IXP2800 Network 1
- Processor 1
- Revision History 2
- Contents 24
- Introduction 1 25
- 1.3 Terminology 26
- Technical Description 2 27
- IXP2800 Network Processor 28
- Technical Description 28
- 2.2 Intel XScale 30
- Core Microarchitecture 30
- 2.2.2.4 Branch Target Buffer 31
- 2.2.2.5 Data Cache 31
- 2.2.2.6 Interrupt Controller 31
- 2.2.2.7 Address Map 32
- 2.3 Microengines 33
- 2.3.2 Control Store 35
- 2.3.3 Contexts 35
- 2.3.4 Datapath Registers 37
- 38 Hardware Reference Manual 38
- 2.3.4.4 Local Memory 39
- 40 Hardware Reference Manual 40
- 2.3.5 Addressing Modes 41
- 42 Hardware Reference Manual 42
- 2.3.6 Local CSRs 43
- 2.3.7 Execution Datapath 43
- 44 Hardware Reference Manual 44
- 2.3.7.2 CAM 45
- 46 Hardware Reference Manual 46
- 2.3.8 CRC Unit 48
- 2.3.9 Event Signals 49
- 2.4 DRAM 50
- 2.5 SRAM 51
- 52 Hardware Reference Manual 52
- 2.5.3 SRAM Atomic Operations 53
- 2.5.5 Reference Ordering 54
- Hardware Reference Manual 55 55
- 2.6 Scratchpad Memory 56
- Scratchpad RAM 57
- 58 Hardware Reference Manual 58
- Hardware Reference Manual 59 59
- 2.7.1 SPI-4 60
- 2.7.2 CSIX 61
- 2.7.3 Receive 61
- 2.7.3.1 RBUF 62
- 2.7.3.2 Full Element List 63
- 2.7.3.3 RX_THREAD_FREELIST 63
- 64 Hardware Reference Manual 64
- 2.7.4 Transmit 65
- 66 Hardware Reference Manual 66
- Hardware Reference Manual 67 67
- 2.7.5.1 SPI-4 68
- 2.7.5.2 CSIX 68
- 2.8 Hash Unit 69
- 2.9 PCI Controller 71
- 2.9.3.1 DMA Descriptor 72
- 2.9.3.2 DMA Channel Operation 73
- 74 Hardware Reference Manual 74
- 2.9.5 PCI Arbiter 75
- 2.11 Intel XScale 76
- Core Peripherals 76
- 2.11.2 Timers 77
- 2.11.3 General Purpose I/O 77
- 2.11.5 Slowport 77
- 2.12 I/O Latency 78
- 2.13 Performance Monitor 78
- 3.2 Features 80
- Hardware Reference Manual 81 81
- 3.3 Memory Management 82
- Hardware Reference Manual 83 83
- 3.3.2 Exceptions 84
- 3.3.4 Control 85
- 3.3.4.3 Locking Entries 86
- Hardware Reference Manual 87 87
- 3.4 Instruction Cache 88
- Hardware Reference Manual 89 89
- 3.4.1.3 Fetch Policy 90
- 3.4.1.5 Parity Protection 91
- 3.4.2.2 Enabling/Disabling 92
- Hardware Reference Manual 93 93
- 94 Hardware Reference Manual 94
- SN WN WT ST 95
- 3.6 Data Cache 96
- 3.6.1 Overviews 97
- 98 Hardware Reference Manual 98
- Hardware Reference Manual 99 99
- 3.6.2.3 Cache Policies 100
- • The MMU is enabled 100
- Hardware Reference Manual 101 101
- 3.6.2.5 Parity Protection 102
- 3.6.2.6 Atomic Accesses 102
- 3.6.3.2 Enabling/Disabling 103
- 104 Hardware Reference Manual 104
- Hardware Reference Manual 105 105
- 3.7 Configuration 106
- 3.8 Performance Monitoring 107
- 108 Hardware Reference Manual 108
- Hardware Reference Manual 109 109
- 110 Hardware Reference Manual 110
- Hardware Reference Manual 111 111
- 3.9.1 Interrupt Latency 112
- 3.9.2 Branch Prediction 112
- 3.9.3 Addressing Modes 113
- 3.9.4 Instruction Latencies 113
- • Minimum Resource Latency 114
- Hardware Reference Manual 115 115
- IXP2800 Network Processor 116
- Intel XScale 116
- Hardware Reference Manual 117 117
- 118 Hardware Reference Manual 118
- 3.10 Test Features 119
- • SRAM and DRAM access: 120
- • PCI Accesses 120
- Hardware Reference Manual 121 121
- IXP2800 122
- Core Gasket 122
- • Byte Write 123
- • Word Write (16 bits) 123
- • Longword write (32 bits) 123
- Byte Write by Intel XScale 124
- 3.11 Intel XScale 125
- Core Gasket Unit 125
- Word 0Word 1 125
- 3.11.4 Atomic Operations 128
- Hardware Reference Manual 129 129
- 3.11.5 I/O Transaction 130
- 3.11.6 Hash Access 130
- 3.11.7 Gasket Local CSR 131
- 3.11.8 Interrupt 132
- 3.12 Intel XScale 134
- Core Peripheral Interface 134
- 3.12.1.1 Data Transfers 135
- 3.12.1.2 Data Alignment 135
- 136 Hardware Reference Manual 136
- 3.12.2 UART Overview 137
- B1741-02 138
- 3.12.4 Baud Rate Generator 139
- 140 Hardware Reference Manual 140
- 3.12.6 Timers 141
- 3.12.7 Slowport Unit 142
- 3.12.7.1 PROM Device Support 143
- 144 Hardware Reference Manual 144
- 3FFFFFFh 145
- 23FFFFFh 145
- 2000000h 145
- 03FFFFFh 145
- 0000000h 145
- 17:10 24:189:2 17:10 24:189:2 147
- 24:1817:109:2 24:1817:109:2 148
- Hardware Reference Manual 149 149
- D[7:0] D[7:0] 150
- Hardware Reference Manual 151 151
- Hardware Reference Manual 153 153
- 154 Hardware Reference Manual 154
- Hardware Reference Manual 155 155
- 156 Hardware Reference Manual 156
- Hardware Reference Manual 157 157
- 158 Hardware Reference Manual 158
- 160 Hardware Reference Manual 160
- Hardware Reference Manual 161 161
- 162 Hardware Reference Manual 162
- 164 Hardware Reference Manual 164
- Hardware Reference Manual 165 165
- Microengines 4 167
- Microengines 168
- 4.1.1 Control Store 169
- 4.1.2 Contexts 169
- Inactive Ready 170
- Sleep Executing 170
- 4.1.3 Datapath Registers 171
- 4.1.3.4 Local Memory 172
- 4.1.4 Addressing Modes 173
- 4.2 Local CSRs 174
- 4.3 Execution Datapath 174
- Hardware Reference Manual 175 175
- 4.3.2 CAM 176
- Hardware Reference Manual 177 177
- 4.4 CRC Unit 179
- 4.5 Event Signals 180
- 4.5.1 Microengine Endianness 181
- 4.5.1.2 Write to TBUF 182
- 4.5.2 Media Access 183
- 4.5.2.1 Read from RBUF 184
- 4.5.2.2 Write to TBUF 185
- 186 Hardware Reference Manual 186
- 5.1 Overview 187
- 5.2 Size Configuration 188
- 5.3 DRAM Clocking 189
- 5.4 Bank Policy 190
- 5.5 Interleaving 191
- Hardware Reference Manual 193 193
- 5.6 Parity and ECC 194
- 5.6.2 Parity Enabled 195
- 5.6.3 ECC Enabled 195
- 5.7 Timing Configuration 196
- 5.8 Microengine Signals 197
- 5.9 Serial Port 197
- 198 Hardware Reference Manual 198
- 5.10.1 Commands 199
- 5.10.2 DRAM Write 199
- 5.10.3 DRAM Read 200
- 5.10.4 CSR Write 200
- 5.10.5 CSR Read 200
- 5.11 DRAM Push/Pull Arbiter 201
- 202 Hardware Reference Manual 202
- Hardware Reference Manual 203 203
- 204 Hardware Reference Manual 204
- Hardware Reference Manual 205 205
- SRAM Interface 6 207
- 208 Hardware Reference Manual 208
- 6.2.1 Internal Interface 209
- 6.2.2 Number of Channels 209
- 210 Hardware Reference Manual 210
- 6.4 Command Overview 211
- 212 Hardware Reference Manual 212
- A9736-01 213
- A9737-01 213
- A9739-01 214
- 6.5 Parity 217
- 6.6 Address Map 218
- 6.7 Reference Ordering 219
- 220 Hardware Reference Manual 220
- 6.8 Coprocessor Mode 221
- Network Processor 222
- Coprocessor 222
- Hardware Reference Manual 223 223
- SRAM Interface 224
- SHaC — Unit Expansion 7 225
- SHaC — Unit Expansion 226
- 7.1.2 Scratchpad 227
- 7.1.2.2 Scratchpad Interface 229
- 230 Hardware Reference Manual 230
- A9757-01 231
- 232 Hardware Reference Manual 232
- Hardware Reference Manual 233 233
- Signal Done 234
- Hardware Reference Manual 235 235
- 7.1.3 Hash Unit 236
- 7.1.3.1 Hashing Operation 237
- 238 Hardware Reference Manual 238
- 7.1.3.2 Hash Algorithm 239
- 8.1 Overview 241
- 242 Hardware Reference Manual 242
- 8.1.1 SPI-4 243
- 244 Hardware Reference Manual 244
- Hardware Reference Manual 245 245
- 8.1.2 CSIX 246
- 8.2 Receive 247
- 8.2.1 Receive Pins 248
- 8.2.2 RBUF 248
- Hardware Reference Manual 249 249
- 8.2.2.1 SPI-4 250
- . The temporary 251
- 252 Hardware Reference Manual 252
- 8.2.2.2 CSIX 253
- • Place into FCEFIFO 253
- 254 Hardware Reference Manual 254
- 8.2.3 Full Element List 255
- 8.2.4 Rx_Thread_Freelist_# 255
- 256 Hardware Reference Manual 256
- Hardware Reference Manual 257 257
- 8.2.7.1 SPI-4 258
- • The RBUF upper limit 258
- • RX_PORT_CALENDAR_STATUS_# 258
- Hardware Reference Manual 259 259
- 8.2.8 Parity 260
- 8.2.9 Error Cases 261
- 8.3 Transmit 262
- 8.3.2 TBUF 263
- Hardware Reference Manual 265 265
- 8.3.2.1 SPI-4 266
- 8.3.2.2 CSIX 267
- 8.3.3.1 SPI-4 268
- 8.3.3.2 CSIX 269
- 8.3.3.3 Transmit Summary 270
- 8.3.4.1 SPI-4 271
- 272 Hardware Reference Manual 272
- 8.3.5 Parity 273
- 8.4 RBUF and TBUF Summary 274
- Hardware Reference Manual 275 275
- 276 Hardware Reference Manual 276
- 8.5.2.1 Full Duplex CSIX 277
- 8.5.2.2 Simplex CSIX 278
- Hardware Reference Manual 279 279
- 8.6 Deskew and Training 280
- Hardware Reference Manual 281 281
- 8.6.1 Data Training Pattern 282
- 8.6.3 Use of Dynamic Training 283
- 284 Hardware Reference Manual 284
- Hardware Reference Manual 285 285
- 286 Hardware Reference Manual 286
- 8.7 CSIX Startup Sequence 287
- 8.7.2 CSIX Simplex 288
- Hardware Reference Manual 289 289
- 290 Hardware Reference Manual 290
- Hardware Reference Manual 291 291
- B2735-01 293
- SPI-4.2 LVTTL Reverse Path 294
- DDR LVDS Flow Control 294
- SPI-4.2 Forward Path 294
- Serial CSIX 295
- Ready Bits 295
- Flow Control 295
- CSIX Flow Control CFramers 295
- (Provides multiple interfaces 296
- Full Duplex 296
- Interface 296
- (SPI-4.2 and CSIX-L1) 297
- B2745-01 298
- B2747-01 299
- Fabric Interface Chip 300
- 8.9.3.1 SPI-4.2 Receiver 301
- 8.9.3.2 SPI-4.2 Transmitter 302
- Interface Chip 303
- 8.9.4.2 Intel 304
- • A clock (TXCCLK, RXCCLK) 305
- Support for Simplex Operation 306
- Hardware Reference Manual 307 307
- 308 Hardware Reference Manual 308
- Hardware Reference Manual 309 309
- 310 Hardware Reference Manual 310
- Hardware Reference Manual 311 311
- 312 Hardware Reference Manual 312
- Hardware Reference Manual 313 313
- 8.9.6 Transmit State Machine 314
- Hardware Reference Manual 315 315
- 8.9.7 Dynamic De-Skew 316
- PCI Unit 9 319
- PCI Unit 320
- Hardware Reference Manual 321 321
- 9.2.1 PCI Commands 322
- Hardware Reference Manual 323 323
- 324 Hardware Reference Manual 324
- • The PCI_AD [1:0] are 00 325
- 9.2.3.1 Configuration Write 325
- 9.2.3.2 Configuration Read 325
- 9.2.5 PCI Target Cycles 326
- Hardware Reference Manual 327 327
- 328 Hardware Reference Manual 328
- 9.2.8 PCI Retry 329
- 9.2.9 PCI Disconnect 329
- 9.2.11 PCI Central Functions 330
- PCI Master 331
- State Machine 331
- PCI Arbiter 331
- PCI UNIT 331
- 9.3 Slave Interface Block 332
- 9.3.2 SRAM Interface 333
- 9.3.3 DRAM Interface 334
- 9.3.3.2 DRAM Slave Reads 335
- 336 Hardware Reference Manual 336
- Hardware Reference Manual 337 337
- 338 Hardware Reference Manual 338
- 9.3.5 PCI Interrupt Pin 339
- 9.4 Master Interface Block 340
- Hardware Reference Manual 341 341
- 9.4.1.3 DMA Descriptor 342
- 9.4.1.4 DMA Channel Operation 343
- 344 Hardware Reference Manual 344
- 9.4.1.8 PCI to DRAM Transfer 345
- Status Registers 346
- A9776-02 347
- 9.5 PCI Unit Error Behavior 348
- Hardware Reference Manual 349 349
- 350 Hardware Reference Manual 350
- Core or Microengine 351
- 352 Hardware Reference Manual 352
- Hardware Reference Manual 353 353
- 354 Hardware Reference Manual 354
- 9.6.1 Endian for Byte Enable 355
- 356 Hardware Reference Manual 356
- Hardware Reference Manual 357 357
- Stepping Description 358
- Clocks and Reset 10 359
- Clocks and Reset 360
- Hardware Reference Manual 361 361
- 362 Hardware Reference Manual 362
- Hardware Reference Manual 363 363
- 10.3 Reset 364
- Hardware Reference Manual 365 365
- 10.3.2 PCI-Initiated Reset 366
- Hardware Reference Manual 367 367
- 10.3.6 Strap Pins 368
- 10.4 Boot Mode 370
- Figure 135. Boot Process 371
- 10.4.1 Flash ROM 372
- 10.4.2 PCI Host Download 372
- 10.5 Initialization 373
- Performance Monitor Unit 11 375
- Performance Monitoring 376
- Hardware Reference Manual 377 377
- 378 Hardware Reference Manual 378
- Performance Monitor Unit 379
- 380 Hardware Reference Manual 380
- 11.2.1 APB Peripheral 381
- 11.2.2 CAP Description 381
- 11.3 Performance Measurements 382
- 11.4.2 Count Events 385
- 386 Hardware Reference Manual 386
- 11.4.4 Null Event 387
- 11.4.5 Threshold Events 388
- 11.4.6 External Input Events 389
- Design Block #(0110) 396
- 11.4.6.4 Intel XScale 402
- Design Block #(0111) 402
- Table 158. Intel XScale 403
- Hardware Reference Manual 405 405
- Design Block #(0011) 425
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