參數(shù)資料
型號: ARM60
廠商: Mitel Networks Corporation
英文描述: Low Power General Purpose 32-Bit RISC Microprocessor(低功耗通用32位精簡指令集微處理器)
中文描述: 低功耗通用32位RISC微處理器(低功耗通用32位精簡指令集微處理器)
文件頁數(shù): 77/121頁
文件大小: 1217K
代理商: ARM60
Coprocessor Interface
73
where it goes not-busy. The coprocessor must therefore preserve the original floating point value and not
corrupt it during the conversion, because it will be required again if an interrupt arises during the busy
period.
The coprocessor data operation class of instruction is not generally subject to idempotency considerations,
as the processing activity can take place after the coprocessor goes not-busy. There is no need for ARM60
to be held up until the result is generated, because the result is confined to stay within the coprocessor.
6.6 UndeTned instructions
Undefined instructions are treated by ARM60 as coprocessor instructions. All coprocessors must be absent
(ie
CPA
and
CPB
must be HIGH) when an undefined instruction is presented. ARM60 will then take the
undefined instruction trap. Note that the coprocessor need only look at bit 27 of the instruction to
differentiate undefined instructions (which all have 0 in bit 27) from coprocessor instructions (which all
have 1 in bit 27).
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