Motorola MC68020 User Manual page 154

Stack Frames
15
SP STATUS REGISTER
+$02
PROGRAM COUNTER
+$06
1 0 1 0
+$08 INTERNAL REGISTER
+$0A SPECIAL STATUS REGISTER
+$0C INSTRUCTION PIPE STAGE C
+$0E INSTRUCTION PIPE STAGE B
+$10
DATA CYCLE FAULT ADDRESS
+$12
+$14
INTERNAL REGISTER
+$16
INTERNAL REGISTER
+$18
DATA OUTPUT BUFFER
+$1A
+$1C INTERNAL REGISTER
+$1E INTERNAL REGISTER
SHORT BUS FAULT STACK FRAME
(16 WORDS) — FORMAT $A
15
SP STATUS REGISTER
+$02
PROGRAM COUNTER
+$06
1 0 1 1
+$08 INTERNAL REGISTER
+$0A SPECIAL STATUS REGISTER
+$0C INSTRUCTION PIPE STAGE C
+$0E INSTRUCTION PIPE STAGE B
+$10
DATA CYCLE FAULT ADDRESS
+$12
+$14
INTERNAL REGISTER
+$16
INTERNAL REGISTER
+$18
DATA OUTPUT BUFFER
+$1A
+$1C
INTERNAL REGISTER,
+$22
+$24
STAGE B ADDRESS
+$28
INTERNAL REGISTERS,
+$2A
+$2C
DATA INPUT BUFFER
+$30
INTERNAL REGISTERS,
+$36
+$38
VERSION #
INTERNAL REGISTERS,
+$5A
LONG BUS FAULT STACK FRAME
(46 WORDS) — FORMAT $B
6-28
Table 6-5. Exception Stack Frames (Continued)
0
VECTOR OFFSET
0
VECTOR OFFSET
4 WORDS
2 WORDS
3 WORDS
INTERNAL INFORMATION
18 WORDS
M68020 USER'S MANUAL
Exception Types (Stacked PC Points to)
Address Error or [Next instruction]
Bus Error —
Execution Unit
at Instruction
Boundary
Address Error or [Address of instruction in
Bus Error — execution when fault occurred —
Instruction may not be the instruction that
Execution in generated the faulted bus cycle]
Progress
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