Freescale Semiconductor MC68881

To Next Page

To Previous Page

Move Register-to-Memory

I t ! EVALUATE I TRANSFER I

I START-UP I CONVERT I (ca) I OPERAND I

Conditional Operations

I ! EVALUATE I I

MC68020/MC68030 ~ START-UP : COND~TION ~ PROCEED I

MC68881 8*

*The timing for the evaluation of the conditional predicate is shown separately in 8.5.2.7 CONDI-

TIONAL

TERMINATION.

**The action taken by the MC68020/MC68030 after the conditional predicate is evaluated by the - xCCw

on the instruction (FPcc, FDBcc, FScc, or FTRAPcc).

Move Control or Multiple Registers

I a EVALUATE I

I REGISTERS i

MC68020/MC68030

! 2., 9 9

MC68881 I .1 9 9 I

Context Save Operation

I f EVALUATE I I TRANSFER I

ISTART.UpI <oa> ;PREPARE-I FRAME'

MC680201MC68030

I ' I 2 ] t I0 I

M00,,,, ' I ,0 l" ,° I

*During this period, the MC68881 may force the MC6802O/MC68030 to wait while an internal operation

is completed, or reaches a point where a save operation can be performed.

Context Restore Operation

I I EVALUATE I TRANSFER I !

MC,,0~0,MC°,0301S~ARTUP I <e~> ; FRAME ' C0NT,NUE" ,

' ' L l----Eiiiiiii

MC68881 10

*When the

context

restore operation is completed, the MC68881 continues with any operation that

was suspended by a previous context save. The MC680201MC68030 does not re-establish commu-

nications with the MC68881 during the FRESTORE instruction, but the execution of a subsequent RTE

instruction restores the

MC68020/MC£~030 context

to the state of the previously suspended operation

if necessary.

FREESCALE

8-20

MC68881/MC68882 USER'S MANUAL

Freescale Semiconductor MC68881 - Page 326