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Table of Contents
MOTOROLA
M68060 USER’S MANUAL
xv
8.3 Exception Priorities ..................................................................................... 8-17
8.4 Return from Exceptions .............................................................................. 8-19
8.4.1 Four-Word Stack Frame (Format $0) .......................................................8-19
8.4.2 Six-Word Stack Frame (Format $2).......................................................... 8-20
8.4.3 Floating-Point Post-Instruction Stack Frame (Format $3) ........................8-20
8.4.4 Eight-Word Stack Frame (Format $4)....................................................... 8-21
8.4.4.1 Program Counter (PC)............................................................................ 8-21
8.4.4.2 Fault Address ......................................................................................... 8-22
8.4.4.3 Fault Status Long Word (FSLW)............................................................. 8-22
8.4.5 Recovering from an Access Error............................................................. 8-25
8.4.6 Bus Errors and Pending Memory Writes .................................................8-27
8.4.7 Branch Prediction Error ............................................................................8-29
Section 9
IEEE 1149.1 Test (JTAG) and Debug Pipe Control Modes
9.1 IEEE 1149.1 Test Access Port (Normal JTAG) Mode .................................. 9-1
9.1.1 Overview..................................................................................................... 9-2
9.1.2 JTAG Instruction Shift Register ..................................................................9-3
9.1.2.1 EXTEST.................................................................................................... 9-4
9.1.2.2 LPSAMPLE............................................................................................... 9-5
9.1.2.3 Private Instructions ................................................................................... 9-5
9.1.2.4 SAMPLE/PRELOAD ................................................................................. 9-5
9.1.2.5 IDCODE.................................................................................................... 9-5
9.1.2.6 CLAMP ..................................................................................................... 9-6
9.1.2.7 HIGHZ....................................................................................................... 9-6
9.1.2.8 BYPASS ................................................................................................... 9-6
9.1.3 JTAG Test Data Registers.......................................................................... 9-7
9.1.3.1 Idcode Register ........................................................................................ 9-7
9.1.3.2 Boundary Scan Register........................................................................... 9-7
9.1.3.3 Bypass Register ..................................................................................... 9-15
9.1.4 Restrictions ............................................................................................... 9-15
9.1.5 Disabling the IEEE 1149.1 Standard Operation .......................................9-15
9.1.6 Motorola MC68060 BSDL Description...................................................... 9-17
9.2 Debug Pipe Control Mode...........................................................................9-24
9.2.1 Debug Command Interface.......................................................................9-25
9.2.2 Debug Pipe Control Mode Commands .....................................................9-27
9.2.3 Emulator Mode .........................................................................................9-31
9.3 Switching between JTAG and Debug Pipe ControlModes of Operation.....9-33
Section 10
Instruction Execution Timing
10.1 Superscalar Operand Execution Pipelines ................................................. 10-1
10.1.1 Dispatch Test 1: sOEP Opword and Required
Extension Words Are Valid .......................................................................10-2
10.1.2 Dispatch Test 2: Instruction Classification ................................................10-2
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