MC68030 Datasheet, PDF (425/602 Pages) Motorola, Inc – ENHANCED 32-BIT MICROPROCESSOR

Coprocessor Interface Description
10.5.2 Main-Processor-Detected Exceptions
A number of exceptions related to coprocessor instruction execution are detected by the
main processor instead of the coprocessor (they are still serviced by the main processor).
These exceptions can be related to the execution of coprocessor response primitives,
communication across the M68000 coprocessor interface, or the completion of conditional
coprocessor instructions by the main processor.
10.5.2.1 PROTOCOL VIOLATIONS . The main processor detects a protocol violation when
it reads a primitive from the response CIR that is not a valid primitive. The protocol violations
that can occur in response to the primitives defined for the M68000 coprocessor interface
are summarized in Table 10-6.
MOTOROLA
MC68030 USER’S MANUAL
10-65