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Hardware Reference Manual 365
Intel
®
IXP2800 Network Processor
Clocks and Reset
“reset_out_strap” is sampled as 0 on the trailing edge of reset, nRESET_OUT is de-asserted based
on the value of IXP_RESET_0[15] which is written by software. If “reset_out_strap” is sampled as
1 on the trailing edge of reset, nRESET_OUT is de-asserted after PLL locks.
During normal function mode, if software wants to pull nRESET_OUT high, it should set
IXP_RESET_0[22] = 1 and then set IXP_RESET_0[15] = 1. To pull nRESET_OUT low, software
should set the IXP_RESET_0[15] bit back to 0.
Figure 133. Reset Out Behavior
A9780-01
PLL
Lock Signal
EXTRST_EN
RESET_OUT
RESET_OUT_STRAP
0
1
1
0
EXTRST
IXP_RESET0
Register
[15]
[22]
- 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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