MC68030 Datasheet, PDF (387/602 Pages) Motorola, Inc – ENHANCED 32-BIT MICROPROCESSOR

Coprocessor Interface Description
15
14
13
12
11
9
8
7
6
5
0
1
1
1
1
CpID
1
0
1
EFFECTIVE ADDRESS
EFFECTIVE ADDRESS EXTENSION WORDS (0-5 WORDS)
Figure 10-17. Coprocessor Context Restore Instruction Format (cpRESTORE)
The first word of the instruction is the F-line operation word, which contains the coprocessor
identification code in bits [9-11] and an M68000 effective addressing code in bits [0-5]. The
effective address encoded in the cpRESTORE instruction is the starting address in memory
where the coprocessor context is stored. The effective address is that of the coprocessor
format word that applies to the context to be restored to the coprocessor.
The instruction can include as many as five effective address extension words following the
first word in the cpRESTORE instruction format. These words contain any additional
information required to calculate the effective address specified by bits [0-5] of the operation
word.
All memory addressing modes except the predecrement addressing mode are valid. Invalid
effective address encodings cause the MC68030 to initiate F-line emulator exception
processing (refer to 10.5.2.2 F-Line Emulator Exceptions).
MOTOROLA
MC68030 USER’S MANUAL
10-27