MC68030RC50C Freescale Semiconductor, MC68030RC50C Datasheet - Page 415

• Manufacturer Part Number: MC68030RC50C
• Description: IC MPU 32BIT ENHANCED 128-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68030RC50C

• Processor Type: M680x0 32-Bit
• Speed: 50MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 128-PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

10
1 0 - 2 8
10.2.3.4.2 Protocol.
field to determine the number of bytes to be transferred to the coprocessor
terminate any current operations and evaluate the format word. If the format
word represents a valid coprocessor context as determined by the copro-
tion, it first reads the coprocessor format word from the effective address in
the instruction. This format word contains a format code and a length field.
during the cpRESTORE operation and writes the format word to the restore
CIR to initiate the coprocessor context restore.
When the coprocessor receives the format word in the restore CIR, it must
cessor design, the coprocessor returns the format word to the main processor
through the restore CIR and prepares to receive the number of bytes specified
After writing the format word to the restore CIR the main processor continues
the cpRESTORE dialog by reading that same register. If the coprocessor
CIR.
restore instruction. When the main processor executes a cpRESTORE instruc-
During cpRESTORE operation, the main processor retains a copy of the length
in the format word through its operand CIR.
returns a valid format word, the main processor transfers the number of
bytes specified by the format word at the effective address to the operand
MI
M2
M3
M4
M5
M6
M7
NOTES: 1. See 10.6.1.5 FORMAT ERROR
ADDRESS SPECIFIED IN OPERATION WORD
WRITE COPROCESSOR FORMAT WORD TO RESTORE CIR
IF (FORMAT = INVALID FORMAT) WRITE $0001
ABORT CODE TO CONTROL CIR AND INITIATE FORMAT
ERROR EXCEPTION PROCESSING (SEE NOTE 1)
IF (FORMAT = EMPTY/RESET} GO TO M7
ELSE, TRANSFER NUMBER OF BYTES SPECIFIED BY
FORMAT WORD TO DPERAND CIR (SEE NOTE 2)
PROCEED WITH EXECUTION OF NEXT INSTRUCTION
RECOGNIZE COPROCESSOR INSTRUCTION F-LINE
OPERATION WORD
REAO COPROCESSOR FORMAT CODE FROM EFFECTIVE
READ RESTORE CIR
Figure 10-18. Coprocessor Context Restore Instruction Protocol
2. The MC68030 uses the length field in the format word read during M2to determine the number
MAIN PROCESSOR
of bytes to read from memory and write to the operand CIR
Figure 10-18 shows the protocol for the coprocessor context
M C 6 8 0 3 0 U S E R ' S M A N U A L
C1
C2
C3
TERMINATE CURRENT OPERATIONS ANO EVALUATE
FORMAT WORD
IF (INVALID FORMAT) PLACE INVALID FORMAT CODE
IN THE RESTORE CIR
IF (VALID FORMAT) RECEIVE NUMBER OF BYTES
INDICATED IN FORMAT WORD THROUGH OPERAND CIR
COPROCESSOR
M O T O R O L A