MC68030FE20C Freescale Semiconductor, MC68030FE20C Datasheet - Page 398

• Manufacturer Part Number: MC68030FE20C
• Description: IC MPU 32BIT ENHANCED 132-CQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68030FE20C

• Processor Type: M680x0 32-Bit
• Speed: 20MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 132-CQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

MOTOROLA
10.2,1.2 PROTOCOL. The execution of a cpGEN instruction follows the protocol
An instruction in the coprocessor general instruction category optionally
word. These words can provide additional information required for the co-
ecution, information required for the calculation must be included in the
shown in Figure 10-7. The main processor initiates communication with the
coprocessor by writing the instruction command word to the command CIR.
The coprocessor decodes the command word to begin processing the cpGEN
instruction. Coprocessor design determines the interpretation of the copro-
cessor command word; the MC68030 does not attempt to decode it,
includes a number of extension words following the coprocessor command
processor instruction. For example, if the coprocessor requests that the
MC68030 calculate an effective address during coprocessor instruction ex-
instruction format as effective address extension words.
M1
M2
M3
M4
NOTES: 1. "Come Again" indicates that further service of the main ;)rocessor is being requested
WRITE COPROCESSOR COMMAND WORD TO
COMMAND CIR
RECOGNIZE COPROCESSOR INSTRUCTION F-LINE
OPERATION WORD
READ COPROCESSOR RESPONSE PRIMITIVE
CODE FROM RESPONSE CIR
2~ IF ~COPROCESSOR RESPONSE PRIMITIVE
PROCEED WITH EXECUTION OF NEXT INSTRUCTION
(SEE NOTE 2)
1) PERFORM SERVICE REDUESTED BY RESPONSE
PRIMITIVE
INDICATES "COME AGAIN' GO TO M3
ISEE NOTE 1)
2 The next instruction should be the operation word pointed to by the ScanPC at this ~o;nt.
The operation of the MC68030 ScanPC is discussed in 10.4.1 ScanPC
by the coprocessor
MAIh PROCESSOR
Figure 10-7. Coprocessor Interface Protocol for
General Category Instructions
MC68030 USER'S MANUAL
C1
C2
C3
C4
C5
WHILE ,MAIN PROCESSOR SERVICE IS REQUIRED~
DECODE COMMAND WORD AND INITIATE
COMMAND EXECUTION
DO STEPS l/AND 21 BELOW
2) RECEIVE SERVICE FROM MA~N PROCESSOR
RESPONSE CIR
1~ REQUEST SERVICE BY PLACING APPROPRIATE
REFLECT "NO COME AGAIN" IN RESPONSE CIR
COMPLETE COMMAND EXECUTION
REFLECT "PROCESSING FINISHED" STATUS IN
RESPONSE PRIMITIVE CODE IN RESPONSE CIR
COPROCESSOR
10-11
1(