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Table of Contents
xiv
M68060 USER’S MANUAL
MOTOROLA
7.7 Processor Data Transfers........................................................................... 7-12
7.7.1 Byte, Word, and Long-Word Read Transfer Cycles ................................. 7-12
7.7.2 Line Read Transfer................................................................................... 7-15
7.7.3 Byte, Word, and Long-Word Write Cycles................................................ 7-20
7.7.4 Line Write Cycles..................................................................................... 7-25
7.7.5 Locked Read-Modify-Write Cycles .......................................................... 7-28
7.7.6 Emulating CAS2 and CAS Misaligned...................................................... 7-31
7.7.7 Using CLA to Increment A3 and A2.......................................................... 7-32
7.8 Acknowledge Cycles................................................................................... 7-32
7.8.1 Interrupt Acknowledge Cycles ................................................................. 7-32
7.8.1.1 Interrupt Acknowledge Cycle (Terminated Normally)............................. 7-35
7.8.1.2 Autovector Interrupt Acknowledge Cycle ............................................... 7-35
7.8.1.3 Spurious Interrupt Acknowledge Cycle .................................................. 7-35
7.8.2 Breakpoint Acknowledge Cycle ................................................................ 7-36
7.8.2.1 LPSTOP Broadcast Cycle ...................................................................... 7-38
7.9 Bus Exception Control Cycles .................................................................... 7-46
7.9.1 Bus Errors................................................................................................. 7-46
7.9.2 Retry Operation ........................................................................................ 7-48
7.9.3 Double Bus Fault ...................................................................................... 7-51
7.10 Bus Synchronization ................................................................................... 7-52
7.11 Bus Arbitration ............................................................................................ 7-52
7.11.1 MC68040-Arbitration Protocol (BB Protocol)............................................ 7-53
7.11.2 MC68060-Arbitration Protocol (BTT Protocol).......................................... 7-58
7.11.3 External Arbiter Considerations................................................................ 7-65
7.12 Bus Snooping Operation............................................................................ 7-68
7.13 Reset Operation......................................................................................... 7-71
7.14 Special Modes of Operation ....................................................................... 7-74
7.14.1 Acknowledge Termination Ignore State Capability................................... 7-74
7.14.2 Acknowledge Termination Protocol .......................................................... 7-76
7.14.3 Extra Data Write Hold Time Mode............................................................ 7-76
Section 8
Exception Processing
8.1 Exception Processing Overview ................................................................... 8-1
8.2 Integer Unit Exceptions................................................................................. 8-4
8.2.1 Access Error Exception .............................................................................. 8-5
8.2.2 Address Error Exception............................................................................. 8-7
8.2.3 Instruction Trap Exception.......................................................................... 8-7
8.2.4 Illegal Instruction and Unimplemented Instruction Exceptions ................... 8-8
8.2.5 Privilege Violation Exception .................................................................... 8-10
8.2.6 Trace Exception........................................................................................ 8-10
8.2.7 Format Error Exception ............................................................................ 8-11
8.2.8 Breakpoint Instruction Exception .............................................................. 8-11
8.2.9 Interrupt Exception ................................................................................... 8-12
8.2.10 Reset Exception ....................................................................................... 8-14
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