M68040 datasheet(9/442 Pages) FREESCALE

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MOTOROLA

M68040 USER’S MANUAL

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

Freescale Semiconductor, Inc.

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