MOTOROLA
M68040 USER’S MANUAL
xix
LIST OF ILLUSTRATIONS (Continued)
Figure
Page
Number
Title
Number
7-26
Word Write Access Terminated with TEA Timing ........................................ 7-39
7-27
Line Read Access Terminated with TEA Timing .......................................... 7-40
7-28
Retry Read Transfer Timing .........................................................................7-41
7-29
Retry Operation on Line Write ......................................................................7-42
7-30
M68040 Internal Interpretation State Diagram and
External Bus Arbiter Circuit ........................................................................ 7-47
7-31
Lock Violation Example ................................................................................ 7-49
7-32
Processor Bus Request Timing.................................................................... 7-50
7-33
Arbitration During Relinquish and Retry Timing ........................................... 7-51
7-34
Implicit Bus Ownership Arbitration Timing.................................................... 7-52
7-35
Dual M68040 Fairness Arbitration State Diagram ........................................7-53
7-36
Dual M68040 Prioritized Arbitration State Diagram ..................................... 7-55
7-37
M68040 Synchronous DMA Arbitration ........................................................ 7-56
7-38
Sample Synchronizer Circuit ........................................................................ 7-57
7-39
M68040 Asynchronous DMA Arbitration ...................................................... 7-58
7-40
Snoop-Inhibited Bus Cycle ........................................................................... 7-61
7-41
Snoop Access with Memory Response........................................................ 7-62
7-42
Snooped Line Read, Memory Inhibited ........................................................ 7-64
7-43
Snooped Long-Word Write, Memory Inhibited ............................................. 7-65
7-44
Initial Power-On Reset Timing...................................................................... 7-66
7-45
Normal Reset Timing ................................................................................... 7-67
7-46
Multiplexed Address and Data Bus (Line Write)........................................... 7-69
7-47
DLE Mode Block Diagram ............................................................................ 7-70
7-48
DLE versus Normal Data Read Timing ........................................................ 7-71
8-1
General Exception Processing Flowchart ....................................................8-3
8-2
General Form of Exception Stack Frame ..................................................... 8-4
8-3
Interrupt Recognition Examples ................................................................... 8-14
8-4
Interrupt Exception Processing Flowchart ....................................................8-16
8-5
Reset Exception Processing Flowchart........................................................ 8-18
8-6
Flowchart of RTE Instruction for Throwaway Four-Word Frame .................. 8-22
8-7
Special Status Word Format ........................................................................ 8-24
8-8
Write-Back Status Format ............................................................................ 8-26
9-1
Floating-Point User Programming Model ..................................................... 9-2
9-2
Floating-Point Control Register .................................................................... 9-4
9-3
FPSR Condition Code Byte.......................................................................... 9-4
9-4
FPSR Quotient Byte ..................................................................................... 9-5
9-5
FPSR Exception Status Byte ....................................................................... 9-5
9-6
FPSR Accrued Exception Byte .................................................................... 9-6
9-7
Intermediate Result Format.......................................................................... 9-12
9-8
Rounding Algorithm Flowchart ..................................................................... 9-14
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Freescale Semiconductor, Inc.
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