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參數(shù)資料
| 型號： | TS8882VF20 |
| 文件頁數(shù)： | 29/42頁 |
| 文件大?。?/td> | 1703K |
| 代理商： | TS8882VF20 |
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29
TS68882
2119A
–
12/01
Miscellaneous
Instructions
Miscellaneous instructions include moves to and from the status, control, and instruction
address registers and a no operation function that can be used to
“
flush
”
exceptions. Also
included are the virtual memory/machine FSAVE and FRESTORE instructions that save and
restore the internal state of the TS 68882.
Addressing Modes
The TS 68882 does not perform address calculations. This satisfies the criterion that an TS
68000 Family coprocessor must not depend on certain features or capabilities that may or
may not be implemented by a given main processor. Thus, when the TS 68882 instructs the
TS 68020/TS 68030 to transfer an operand via the coprocessor interface, the MPU performs
the addressing mode calculations requested in the instruction. In this case, the instruction is
encoded specifically for the TS 68020/TS 68030, and the execution of the TS 68882 is not
dependent on that encoding, but only on the value of the command word written to the TS
68882 by the main processor.
This interface is quite flexible and allows any addressing mode to be used with floating-point
instructions. For the TS 68000 Family, these addressing modes include immediate, postincre-
ment, predecrement, data or address register direct, and the indexed/indirect addressing
modes of the TS 68020/TS 68030. Some addressing modes are restricted for some instruc-
tions in keeping with the TS 68000 Family architectural definitions (e.g., PC relative
addressing is not allowed for a destination operand).
The orthogonal instruction set of the TS 68882, along with the flexible branches and address-
ing modes, allows a programmer writing assembly language code, or a compiler writer
generating object or source code for the MPU/TS 68882 device pair, to think of the TS 68882
GE
Greater Than or Equal
LT
Less Than
LE
Less Than or Equal
GL
Greater or Less Than
GLE
Greater Less or Equal
NGLE
Not (Greater, Less or Equal)
NGL
Not (Greater or Less)
NLE
Not (Less or Equal)
NLT
Not (Less Than)
NGE
Not (Greater or Equal)
NGT
Not (Greater Than)
SNE
Signaling Not Equal
ST
Signaling True
Table 9.
Floating-point Conditional Test Specifiers
Mnemonic
Definition
FMOVE
(ea),FPcr
Move to Control Register(s)
FMOVE
FPcr,(ea)
Move from Control Register(s)
FNOP
No Operation
FSAVE
(ea)
Virtual Machine State Save
FRESTORE
(ea)
Virtual Machine State Restore
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