MC68030 Datasheet, PDF (418/602 Pages) Motorola, Inc – ENHANCED 32-BIT MICROPROCESSOR

Coprocessor Interface Description
15
14 13 12 11 10
9
0
PC
0
1
1
1
0
8
7
1
0
VECTOR NUMBER
Figure 10-42. Take Mid-Instruction Exception Primitive Format
This primitive uses the PC bit as previously described. Bits ;ob7-0] contain the exception
vector number used by the main processor to initiate exception processing.
When the main processor receives this primitive, it acknowledges the coprocessor
exception request by writing an exception acknowledge mask (refer to 10.3.2 Control CIR)
to the control CIR. The MC68030 then performs exception processing as described in 8.1
Exception Processing Sequence. The vector number for the exception is taken from bits
[0-7] of the primitive and the MC68030 uses the 10-word stack frame format shown in Figure
10-43.
10-58
MC68030 USER’S MANUAL
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