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MOTOROLA M68040 USER’S MANUAL xv
TABLE OF CONTENTS (Continued)
Paragraph Page
Number Title Number
B.4 Special Modes Of Operation ................................................................. B-8
B.5 Exception Processing............................................................................ B-10
B.5.1 Unimplemented Floating-Point Instructions and Exceptions ............. B-10
B.5.2 MC68EC040 Stack Frames ............................................................... B-11
B.6 Software Considerations ....................................................................... B-12
B.7 MC68EC040 Electrical Characteristics ................................................. B-12
B.7.1 Maximum Ratings .............................................................................. B-12
B.7.2 Thermal Characteristics ..................................................................... B-12
B.7.3 DC Electrical Specifications ............................................................... B-13
B.7.4 Power Dissipation .............................................................................. B-13
B.7.5 Clock AC Timing Specifications ......................................................... B-14
B.7.6 Output AC Timing Specifications ....................................................... B-15
B.7.7 Input AC Timing Specifications.......................................................... B-16
Appendix C
MC68040V and MC68EC040V
C.1 Additional Signals.................................................................................. C-1
C.1.1 Low Frequency Operation (LFO) ....................................................... C-2
C.1.2 Loss of Clock (LOC) .......................................................................... C-2
C.1.3 System Clock Disable (SCD)............................................................. C-2
C.2 Low-Power Stop Mode .......................................................................... C-3
C.2.1 Bus Arbitration and Snooping ............................................................ C-5
C.2.2 Low Frequency Operation ................................................................. C-5
C.2.3 Changing BCLK Frequency ............................................................... C-5
C.2.4 LPSTOP Instruction Summary .......................................................... C-6
C.3 Clocking During Normal Operation ....................................................... C-7
C.4 Reset Operation .................................................................................... C-7
C.5 Power Cycling ....................................................................................... C-9
C.6 MC68040V and MC68EC040V JTAG (Preliminary) .............................. C-10
C.6.1 Instruction Shift Register ................................................................... C-11
C.6.1.1 EXTEST ......................................................................................... C-12
C.6.1.2 HIGHZ ............................................................................................ C-12
C.6.1.3 SAMPLE/PRELOAD ...................................................................... C-12
C.6.1.4 CLAMP........................................................................................... C-12
C.6.1.5 BYPASS......................................................................................... C-13
C.6.2 Boundary Scan Register.................................................................... C-13
C.6.3 Restrictions ........................................................................................ C-16
C.6.4 Disabling The IEEE Standard 1149.1A Operation............................. C-16
C.6.5 MC68040V and MC68EC040V JTAG Electrical Characteristics ....... C-17
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