參數(shù)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(shù)： 61/174頁
文件大?。?/td> 694K
代理商： ARM610
Instruction Set - LDR, STR
ARM610 Data Sheet
4-33
O
Big-endian configuration
A signed byte load (LDRSB) expects data on data bus inputs 31 through to 24 if the
supplied address is on a word boundary, on data bus inputs 23 through to 16 if it is a
word address plus one byte, and so on. The selected byte is placed in the bottom 8
bits of the destination register, and the remaining bits of the register are filled with the
sign bit, bit 7 of the byte. Please see
·
Figure 3-1: Big endian addresses of bytes within
wordson page 3-3
A halfword load (LDRSH or LDRH) expects data on data bus inputs 31 through to 16
if the supplied address is on a word boundary and on data bus inputs 15 through to 0
if it is a halfword boundary, (A[1]=1). The supplied address should always be on a
halfword boundary. If bit 0 of the supplied address is HIGH then the ARM610 will load
an unpredictable value. The selected halfword is placed in the bottom 16 bits of the
destination register. For unsigned halfwords (LDRH), the top 16 bits of the register are
filled with zeros and for signed halfwords (LDRSH) the top 16 bits are filled with the
sign bit, bit 15 of the halfword.
A halfword store (STRH) repeats the bottom 16 bits of the source register twice across
the data bus outputs 31 through to 0. The external memory system should activate the
appropriate halfword subsystem to store the data. Note that the address must be
halfword aligned, if bit 0 of the address is HIGH this will cause unpredictable
behaviour.
4.8.5 Use of R15
Writeback should not be specified if R15 is specified as the base register (Rn). When
using R15 as the base register you must remember it contains an address 8 bytes on
from the address of the current instruction.
R15 should not be specified as the register offset (Rm).
When R15 is the source register (Rd) of a halfword store (STRH) instruction, the
stored address will be address of the instruction plus 12.
4.8.6 Data aborts
A transfer to or from a legal address may cause problems for a memory management
system. For instance, in a system which uses virtual memory the required data may
be absent from the main memory. The memory manager can signal a problem by
taking the processor ABORT input HIGH whereupon the Data Abort trap will be taken.
It is up to the system software to resolve the cause of the problem, then the instruction
can be restarted and the original program continued.
4.8.7 Instruction cycle times
Normal LDR(H,SH,SB) instructions take 1S + 1N + 1I
LDR(H,SH,SB) PC take 2S + 2N + 1I incremental cycles.
S,N and I are defined in
·
6.2 Cycle Typeson page 6-2
.
STRH instructions take 2N incremental cycles to execute.
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