參數資料
型號： ARM610
廠商： Mitel Networks Corporation
英文描述： General Purpose 32-Bit Microprocessor with 4kByte Cache,Write Buffer and Memory Management Unit(通用32位微處理器（帶4K字節(jié)緩存，寫緩沖器和存儲器管理單元）)
中文描述： 通用32位微處理器4KB的高速緩存，寫緩沖器和存儲器管理單元（通用32位微處理器（帶4K的字節(jié)緩存，寫緩沖器和存儲器管理單元））
文件頁數： 172/174頁
文件大?。?/td> 694K
代理商： ARM610
Backward Compatibility
ARM610 Data Sheet
A-2
A.1 Backward Compatibility
Two of the Control Register bits, prog32 and data32, allow one of three processor
configurations to be selected as follows:
1
26–bit program and data
configuration forces ARM610 to operate like the earlier ARM processors with
26-bit address space. The programmer's model for these processors applies,
but the new instructions to access the CPSR and SPSR registers operate as
detailed elsewhere in this document. In this configuration it is impossible to
select a 32-bit operating mode, and all exceptions (including address
exceptions) enter the exception handler in the appropriate 26-bit mode.
space
—(prog32 LOW, data32
LOW). This
2
26–bit program space and 32–bit data
HIGH). This is the same as the 26-bit program and data space configuration,
but with address exceptions disabled to allow data transfer operations to
access the full 32-bit address space.
space
—(prog32 LOW, data32
3
32–bit program and data
configuration extends the address space to 32 bits, introduces major changes
in the programmer's model as described below and provides support for
running existing 26-bit programs in the 32-bit environment.
The fourth processor configuration which is possible (26-bit data space and 32-bit
program space) should not be selected.
space
—(prog32 HIGH, data32 HIGH). This
When configured for 26–bit program space, ARM8 is limited to operating in one of four
modes known as the 26–bit modes. These modes correspond to the modes of the
earlier ARM processors and are known as:
User26
FIQ26
IRQ26 and
Supervisor26.
These are the normal operating modes in this configuration and the 26-bit modes are
only provided for backwards compatibility to allow execution of programs originally
written for earlier ARM processors.
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