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MOTOROLA M68040 USER’S MANUAL xi
TABLE OF CONTENTS (Continued)
Paragraph Page
Number Title Number
7.8.2.3 M68040 Synchronous DMA Arbitration .......................................... 7-55
7.8.2.4 M68040 Asynchronous DMA Arbitration ........................................ 7-57
7.9 Bus Snooping Operation ....................................................................... 7-59
7.9.1 Snoop-Inhibited Cycle........................................................................ 7-60
7.9.2 Snoop-Enabled Cycle (No Intervention Required) ............................ 7-61
7.9.3 Snoop Read Cycle (Intervention Required) ....................................... 7-63
7.9.4 Snoop Write Cycle (Intervention Required) ....................................... 7-63
7.10 Reset Operation .................................................................................... 7-65
7.11 Special Modes of Operation .................................................................. 7-68
7.11.1 Output Buffer Impedance Selection ................................................... 7-68
7.11.2 Multiplexed Bus Mode ....................................................................... 7-68
7.11.3 Data Latch Enable Mode ................................................................... 7-69
Section 8
Exception Processing
8.1 Exception Processing Overview ............................................................ 8-1
8.2 Integer Unit Exceptions ......................................................................... 8-5
8.2.1 Access Fault Exception ..................................................................... 8-6
8.2.2 Address Error Exception.................................................................... 8-8
8.2.3 Instruction Trap Exception ................................................................. 8-8
8.2.4 Illegal Instruction and Unimplemented Instruction Exceptions .......... 8-9
8.2.5 Privilege Violation Exception ............................................................. 8-9
8.2.6 Trace Exception ................................................................................. 8-10
8.2.7 Format Error Exception ..................................................................... 8-11
8.2.8 Breakpoint Instruction Exception ....................................................... 8-12
8.2.9 Interrupt Exception ............................................................................ 8-12
8.2.10 Reset Exception................................................................................. 8-17
8.3 Exception Priorities ............................................................................... 8-19
8.4 Return From Exceptions........................................................................ 8-20
8.4.1 Four-Word Stack Frame (Format $0) ................................................ 8-21
8.4.2 Four-Word Throwaway Stack Frame (Format $1) ............................. 8-21
8.4.3 Six-Word Stack Frame (Format $2) ................................................... 8-22
8.4.4 Floating-Point Post-Instruction Stack Frame (Format $3) ................. 8-23
8.4.5 Eight-Word Stack Frame (Format $4)................................................ 8-23
8.4.6 Access Error Stack Frame (Format $7) ............................................. 8-24
8.4.6.1 Effective Address ........................................................................... 8-24
8.4.6.2 Special Status Word (SSW) ........................................................... 8-24
8.4.6.3 Write-Back Status .......................................................................... 8-26
8.4.6.4 Fault Address ................................................................................. 8-26
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