Exception Vector Assignments - Motorola M68060 User Manual

Exception Processing
The MC68060 supports a 1024-byte vector table containing 256 exception vectors (see
Table 8-1). Motorola defines the first 64 vectors and reserves the other 192 vectors for user-
defined interrupt vectors. External devices can use vectors reserved for internal purposes
at the discretion of the system designer. External devices can also supply vector numbers
for some exceptions. External devices that cannot supply vector numbers use the autovec-
tor capability, which allows the MC68060 to automatically generate a vector number.
Vector Vector
Number(s) Offset (Hex)
0 000
1 004
2 008
3 00C
4 010
5 014
6 018
7 01C
8 020
9 024
10 028
11 02C
11 02C
11 02C
12 030
13 034
14 038
15 03C
16–23 040–05C
24 060
25 064
26 068
27 06C
28 070
29 074
30 078
31 07C
32–47 080–0BC
48–55 0C0–0DC
56 0E0
57 0E4
58 0E8
59 0EC
60 0F0
61 0F4
62–63 0F8–0FC
64–255 100–3FC
*
For the Access Fault exception, refer to 8.4.4.1 Program Counter (PC) .
"fault" refers to the PC of the instruction that caused the exception.
"next" refers to the PC of the next instruction that follows the instruction that caused the fault.
†
Refer to Section 6 Floating-Point Unit .
8.2 INTEGER UNIT EXCEPTIONS
The following paragraphs describe the external interrupt exceptions and the different types
of exceptions generated internally by the MC68060 integer unit. The following exceptions
are discussed:
• Access Error
• Address Error
8-4
Table 8-1. Exception Vector Assignments
Stacked
Stack Frame
Program
Format
*
Counter
— —
— —
4 —
2 fault
0 fault
2 next
2 next
2 next
0 fault
2 next
0 fault
0 fault
2 next
4 next
next
0
—
0
fault
0
next
— —
0 next
0 next
0 next
0 next
0 next
0 next
0 next
0 next
0 next
— —
— —
— —
— —
— —
0 fault
0 fault
— —
0 next
M68060 USER'S MANUAL
Assignment
Reset Initial SSP
Reset Initial PC
Access Fault
Address Error
Illegal Instruction
Integer Divide-by-Zero
CHK, CHK2 Instructions
TRAPcc, TRAPV Instructions
Privilege Violation
Trace
Line 1010 Emulator (Unimplemented A-Line Opcode)
Line 1111 Emulator (Unimplemented F-Line Opcode)
Floating-Point Unimplemented Instruction
Floating-Point Disabled
Emulator Interrupt
Defined for MC68020 and MC68030, not used by MC68060
Format Error
Uninitialized Interrupt
(Unassigned, Reserved)
Spurious Interrupt
Level 1 Interrupt Autovector
Level 2 Interrupt Autovector
Level 3 Interrupt Autovector
Level 4 Interrupt Autovector
Level 5 Interrupt Autovector
Level 6 Interrupt Autovector
Level 7 Interrupt Autovector
TRAP #0–15 Instruction Vectors
†
Floating-Point Exceptions
Defined for MC68030 and MC68851, not used by MC68060
Defined for MC68851, not used by MC68060
Defined for MC68851, not used by MC68060
(Unassigned, Reserved)
Unimplemented Effective Address
Unimplemented Integer Instruction
(Unassigned, Reserved)
User Defined Vectors (192)
MOTOROLA