MC68020 Motorola, MC68020 Datasheet - Page 160

• Manufacturer Part Number: MC68020
• Description: (MC68020 / MC68EC020) MICROPROCESSORS USERS MANUAL
• Manufacturer: Motorola

7.2 COPROCESSOR INSTRUCTION TYPES
The M68000 coprocessor interface supports four categories of coprocessor instructions:
general, conditional, context save, and context restore. The category name indicates the
type of operations provided by the coprocessor instructions in the category. The
instruction category also determines the CIR accessed by the MC68020/EC020 to initiate
instruction and communication protocols between the main processor and the
coprocessor necessary for instruction execution.
During the execution of instructions in the general or conditional categories, the
coprocessor uses the set of coprocessor response primitive codes defined for the M68000
coprocessor interface to request services from and indicate status to the main processor.
During the execution of the instructions in the context save and context
MOTOROLA
$0C
$1C
$00
$04
$08
$10
$14
$18
Figure 7-4. Coprocessor Address Map in MC68020/EC020 CPU Space
31
CPU SPACE ADDRESS
Figure 7-5. Coprocessor Interface Register Set Map
OPERATION WORD
REGISTER SELECT
(RESERVED)
$2E01F
$20000
$2001F
$22000
$2201F
$24000
$2E000
RESPONSE
SAVE
M68020 USER’S MANUAL
INTERFACE REGISTER SET
INTERFACE REGISTER SET
INTERFACE REGISTER SET
RESERVED
RESERVED
RESERVED
INSTRUCTION ADDRESS
OPERAND ADDRESS
OPERAND
16
15
ADDRESS SPACE FOR
COPROCESSOR WITH
CpID = 0
ADDRESS SPACE FOR
COPROCESSOR WITH
CpID = 1
ADDRESS SPACE FOR
COPROCESSOR WITH
CpID = 7
(RESERVED)
CONDITION
COMMAND
CONTROL
RESTORE
0
7- 7