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