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M68040 USER’S MANUAL
MOTOROLA
TABLE OF CONTENTS (Continued)
Paragraph
Number
Page
Number
Title
6.2.2
6.2.3
6.2.4
6.2.5
6.2.6
6.2.7
6.2.8
6.3
6.4
6.5
6.6
6.7
HIGHZ ...............................................................................................
SAMPLE/PRELOAD..........................................................................
DRVCTL.T.........................................................................................
SHUTDOWN .....................................................................................
PRIVATE ...........................................................................................
DRVCTL.S.........................................................................................
BYPASS............................................................................................
Boundary Scan Register.......................................................................
Restrictions ...........................................................................................
Disabling The IEEE Standard 1149.1A Operation................................
Motorola M68040 BSDL Description (Version 2.2) ...............................
MC68040, MC68LC040, MC68EC040
JTAG Electrical Characteristics ..........................................................
6-4
6-4
6-4
6-5
6-5
6-5
6-6
6-6
6-12
6-13
6-15
6-21
Section 7
Bus Operation
7.1
7.2
7.3
7.4
7.4.1
7.4.2
7.4.3
7.4.4
7.4.5
7.5
7.5.1
7.5.1.1
7.5.1.2
7.5.1.3
7.5.2
7.6
7.6.1
7.6.2
7.6.3
7.7
7.8
7.8.1
7.8.2
7.8.2.1
7.8.2.2
Bus Characteristics ...............................................................................
Data Transfer Mechanism.....................................................................
Misaligned Operands ............................................................................
Processor Data Transfers .....................................................................
Byte, Word, and Long-Word Read Transfers ....................................
Line Read Transfer............................................................................
Byte, Word, and Long-Word Write Transfers ....................................
Line Write Transfers ..........................................................................
Read-Modify-Write Transfers (Locked Transfers) .............................
Acknowledge Bus Cycles......................................................................
Interrupt Acknowledge Bus Cycles....................................................
Interrupt Acknowledge BUS Cycle (Terminated Normally)............
Autovector Interrupt Acknowledge bus Cycle................................
Spurious Interrupt Acknowledge Bus Cycle...................................
Breakpoint Interrupt Acknowledge Bus Cycle.......................................
Bus Exception Control Cycles...............................................................
Bus Errors .........................................................................................
Retry Operation .................................................................................
Double Bus Fault...............................................................................
Bus Synchronization .............................................................................
Bus Arbitration And Examples ..............................................................
Bus Arbitration...................................................................................
Bus Arbitration Examples ..................................................................
Dual M68040 Fairness Arbitration .................................................
Dual M68040 Prioritized Arbitration...............................................
7-1
7-3
7-6
7-9
7-10
7-12
7-20
7-22
7-26
7-29
7-29
7-31
7-33
7-34
7-35
7-36
7-37
7-41
7-43
7-43
7-44
7-45
7-52
7-52
7-54