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External Bus Interface

MOTOROLA MPC823e REFERENCE MANUAL 13-43

EXTERNAL BUS

INTERFACE

Figure 13-28. RETRY Transfer Timing–Internal Arbiter

CLKOUT

A[6:31]

BG(OUTPUT)

DATA

RD/WR

BURST

TSIZ[0:1]

RETRY

ALLOW EXTERNAL MASTER

TO GAIN THE BUS

Main Page

Table of Contents3
List of Tables44
Features49
Section 1 Introduction49
Architecture54
- The Embedded Powerpc Core56
- The System Interface Unit56
- The Communication Processor Module57
- The Video/Lcd Controller58
  - The Video Controller58
  - The LCD Controller58
The PCMCIA-ATA Controller58
Power Management59
System Debug Support59
Applications59
Differences between MPC823 (Rev B) and Mpc823E60
Mpc823E Glueless System Design60
- External Signals62
The System Bus Signals63
- Memory Map77
- Reset89
Types of Reset90
- Power-On Reset90
- External Hard Reset91
- Internal Hard Reset91
- External Soft Reset92
- Internal Soft Reset92
  - Debug Port Soft Reset92
Reset Status Register93
How to Configure Reset95
- Hard Reset95
  - Hard Reset Configuration Word98
- Soft Reset100
  - Clocks and Power Control101
Features101
Register Model103
- System Clock and Reset Control Register103
- PLL, Low-Power, and Reset Control Register107
The Clock Module110
- On-Chip Oscillators and External Clock Input112
- System PLL112
  - SPLL Stability113
- The Low-Power Clock Divider114
- Internal Clock Signals116
- Clock Configuration122
  - Mode Clock Pins122
  - The System Phase-Locked Loop Pins123
Power Control124
- Power Rails124
- Keep-Alive Power125
  - Power Switching Example126
Low-Power Operation128
- The Powerpc Core132
Features132
Basic Structure of the Core133
- Instruction Flow Within the Core133
- Basic Instruction Pipeline135
Sequencer Unit135
- Flow Control136
- Issuing Instructions137
- Interrupts138
- Implementing the Precise Exception Model139
  - Restartability after an Interrupt141
- Processing an Interrupt142
- Serialization143
  - Latency143
- The External Interrupt144
  - Latency144
- Interrupt Ordering145
The Register Unit146
- Control Registers147
The Fixed-Point Unit155
- XER Update in Divide Instructions155
The Load/Store Unit156
- Issuing Load/Store Instructions157
- Serializing Load/Store Instructions158
- Instructions Issued to the Data Cache158
- Issuing Store Instruction Cycles158
- Issuing Nonspeculative Load Instructions158
- Executing Unaligned Instructions159
- Little-Endian Mode Support160
- Atomic Update Primitives160
- Instruction Timing161
- Stalling Storage Control Instructions161
- Accessing Off-Core Special Registers161
- Storage Control Instructions162
- Exceptions162
  - DAR, DSISR, and BAR Operation162
  - Powerpc Architecture Compliance163
Powerpc User Instruction Set Architecture (Book I)163
- Computation Modes163
- Reserved Fields163
- Classes of Instructions163
- Exceptions164
- The Branch Processor164
- Fetching Instructions164
- Branch Instructions164
  - Invalid Branch Instruction Forms164
  - Branch Prediction164
- The Fixed-Point Processor164
  - Move To/From System Register Instructions164
  - Fixed-Point Arithmetic Instructions165
- The Load/Store Processor165
Powerpc Virtual Environment Architecture (Book II)166
- Storage Model166
  - Memory Coherence166
  - Atomic Update Primitives166
- The Effect of Operand Placement on Performance167
- The Storage Control Instructions167
- Timebase168
Powerpc Operating Environment Architecture (Book III)168
- The Branch Processor168
- The Fixed-Point Processor168
  - Unsupported Registers168
  - Added Registers168
- Storage Model168
- Reference and Change Bits169
- Storage Protection169
- Storage Control Instructions169
- Interrupts169
- Timer Facilities179
- Optional Facilities and Instructions179
  - Instruction Execution Timing180
Instruction Timing List180
Instruction Execution Timing Examples183
- Data Cache Load183
- Writeback184
  - Writeback Arbitration184
  - Private Writeback Bus Load185
- Fastest External Load (Data Cache Miss)186
- A Full History Buffer187
- Branch Folding188
- Branch Prediction189
  - Instruction Cache190
Features190
Programming the Instruction Cache193
- Instruction Cache Control and Status Register194
- Instruction Cache Address Register195
- Instruction Cache Data Port Register196
Instruction Cache Operation196
- Instruction Cache Hit196
- Instruction Cache Miss197
- Instruction Fetch on a Predicted Path197
Instruction Cache Commands197
- Invalidating the Instruction Cache198
- Loading and Locking the Instruction Cache199
- Unlocking a Line199
- Unlocking the Entire Instruction Cache200
- Inhibiting the Instruction Cache200
- Instruction Cache Read201
- Instruction Cache Write203
Restrictions203
Instruction Cache Coherency203
Updating Code and Memory Region Attributes203
Reset Sequence203
Debug Support204
- Fetching Instructions from the Development Port204
  - Data Cache205
Features205
Organization of the Data Cache206
Programming the Data Cache207
- Powerpc Architecture Instructions207
- Implementation-Specific Operations208
- Special Registers of the Data Cache208
Operating the Data Cache214
- Data Cache Read214
- Data Cache Write214
  - Copyback Mode215
  - Writethrough Mode216
- Data Cache Inhibited Accesses216
- Data Cache Freeze216
- Data Cache Coherency217
Data Cache Commands217
- Flushing and Invalidating the Cache217
- Enabling and Disabling the Cache217
- Locking and Unlocking the Cache217
- Data Cache Instructions218
- Data Cache Read218
  - Memory Management Unit219
Features219
Address Translation220
- Translation Lookaside Buffer Operation220
Protection221
Storage Control222
Translation Table Structure223
- Level One Descriptor227
- Level Two Descriptor228
Programming the Memory Management Unit233
- Control Registers234
- MMU Data Content-Addressable Registers255
- MMU Instruction Content-Addressable Registers261
Interrupts265
- Implementation-Specific Instruction TLB Miss265
- Implementation-Specific Data TLB Miss265
- Implementation-Specific Instruction TLB Error266
- Implementation-Specific Data TLB Error266
Manipulating the Translation Lookaside Buffer267
- Reloading the Translation Lookaside Buffer267
  - Translation Reload Examples268
- Controlling the TLB Replacement Counter269
- Invalidating the Translation Lookaside Buffer269
- Loading the Reserved TLB Entries269
Requirements for Accessing the Memory Management Unit Control Registers270
- System Interface Unit271
Features272
System Configuration and Protection272
Interrupt Configuration275
- The Interrupt Structure275
- Priority of the Interrupt Sources276
- Programming the Interrupt Controller277
The Bus Monitor281
The Powerpc Decrementer282
- Decrementer Register283
The Powerpc Timebase284
- Timebase Register284
- Timebase Reference Registers285
- Timebase Status and Control Register286
The Real-Time Clock287
- Real-Time Clock Status and Control Register288
- Real-Time Clock Register289
- Real-Time Clock Alarm Seconds Register290
- Real-Time Clock Alarm Register291
The Periodic Interrupt Timer292
- Periodic Interrupt Status and Control Register293
- Periodic Interrupt Timer Count Register294
- Periodic Interrupt Timer Register295
The Software Watchdog Timer296
- Software Service Register297
Freeze Operation298
- Low-Power Stop Operation298
Multiplexing the System Interface Unit Pins299
Programming the System Interface Unit300
- System Configuration and Protection Registers300
Features308
Transfer Signals308
- Control Signals310
Bus Signal Descriptions311
Bus Interface Operation314
- Basic Transfers315
- Single Beat Transfers315
  - Single Beat Read Flow316
  - Single Beat Write Flow319
- Burst Transfers323
- The Burst Mechanism323
- Transfer Alignment and Packaging332
- Arbitration Phase-Related Signals334
- Address Transfer Phase-Related Signals338
- Data Transfer Phase-Related Signals343
  - Data Signal343
- Termination Phase-Related Signals343
- Storage Reservation Protocol345
- Exception Control Cycles348
  - RETRY Signal349
    - Endian Modes354
Little-Endian Features356
Big-Endian System Features358
Powerpc Little-Endian System Features358
Setting the Endian Mode of Operation358
- Memory Controller359
Features359
Architecture362
Register Model365
- Register Descriptions367
  - Base Registers367

Motorola MPC823e - Page 350

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