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Topic: Addressing mode


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  Addressing mode - Wikipedia, the free encyclopedia
Addressing modes, a concept from computer science, are an aspect of the instruction set architecture in most central processing unit (CPU) designs.
The various addressing modes that are defined in a given instruction set architecture define how machine language instructions in that architecture identify the operand (or operands) of each instruction.
Furthermore, an addressing mode which, in one given architecture, is treated as a single addressing mode may represent functionality that, in another architecture, is covered by two or more addressing modes.
en.wikipedia.org /wiki/Addressing_mode   (2674 words)

  
 addressing mode Computer Encyclopedia Enterprise Resource Directory Complete Guide to Internet   (Site not responding. Last check: 2007-10-08)
The most common modes are "register" - the operand is stored in a specified {register}; "absolute" - the operand is stored at a specified memory address; and "{immediate}" - the operand is contained within the instruction.
Indirect addressing modes often have options for pre- or post- increment or decrement, meaning that the register or memory location containing the {effective address} is incremented or decremented by some amount (either fixed or also specified in the instruction), either before or after the instruction is executed.
The addressing mode may be "implicit" - the location of the operand is obvious from the particular instruction.
www.jaysir.com /computer-encyclopedia/a/addressing-mode-computer-terms.htm   (376 words)

  
 NeXT
Modes 0 through 5 represent only one basic addressing mode, while mode 6 encompasses eight different ones, and mode 7 is used to represent the remaining eleven.
This mode is the same as the address register indirect, except that the contents of the address register are incremented by the size of the operand after the memory location has been accessed.
This mode is the same as the address register indirect mode, except that the contents of the address register are decremented by the size of the operand before the memory location is accessed.
www.cs.mcgill.ca /~cs573/fall2002/notes/next/chap3.html   (1489 words)

  
 Department of Computer Science - PDP-11 - Don S. Bidulock
Thus, the register arrangement to be considered in conjunction with instructions and with addressing modes is: registers 0-5 are general purpose registers, register 6 is the hardware stack pointer, and register 7 is the program counter.
Mode 3, autoincrement deferred, is used to access lists of operands stored anywhere in the system, i.e., the operands do not have to reside in adjoining locations.
This mode is similar to the relative mode, except that it involves one additional level of addressing to obtain the operand.
pages.cpsc.ucalgary.ca /~dsb/PDP11/AddrModes.html   (2179 words)

  
 Art of Assembly: Chapter Four-3
Beyond the increase to 32 bits, the new addressing modes on the 80386 are probably the biggest improvement to the chip over earlier processors.
These addressing modes are particularly useful for accessing elements of arrays, though they are not limited to such purposes.
When using base/indexed and base/indexed/disp addressing modes on the 80386, without a scaling option (that is, letting the scaling default to "*1"), the first register appearing in the addressing mode is the base register and the second is the index register.
webster.cs.ucr.edu /AoA/DOS/ch04/CH04-3.html   (2253 words)

  
 [No title]
The direct mode is a static addressing mode that requires the address of the variable to be known at the time the program is assembled.
The mode allows one of the BX, BP, SI, or DI registers to be specified as the addressing register that contains the address of the variable of interest.
The (indirect) indexed addressing mode is similar to the register mode, except that an additional constant value is specified along with the addressing register.
www.sce.carleton.ca /courses/94201/f01/94201.notes16-18-indirect-stacks.doc   (1660 words)

  
 ADDRESSING MODES OF 8086
With the Register Addressing mode the operand to be accessed is specified as residing in n internal register of the 8086.
This effective address is a 16-bit offset of the storage location of the operand from the current value in the data segment (DS) register.EA is combined with the contents of DS in the BIU to produce the physical address of the operand.
In the based addressing mode, the physical address of the operand is obtained by adding a direct or indirect displacement of the contents of either base register BX or base pointer register BP and the current value in DS and SS respectively.
www.ece.unh.edu /courses/ece707_4/am8086.htm   (575 words)

  
 VAX MACRO and Instruction Set Reference Manual   (Site not responding. Last check: 2007-10-08)
The operand to be specified by index mode addressing is termed the primary operand.
The names of the addressing modes resulting from index mode addressing are formed by adding the suffix "indexed" to the addressing mode of the base operand specifier.
Table 8-5 is a summary of general register addressing and Table 8-6 is a summary of PC addressing.
www.cuis.edu /doc_vms_html/000000/731final/4515/4515pro_015.html   (1308 words)

  
 [No title]   (Site not responding. Last check: 2007-10-08)
G65SC802 and G65SC816 Microprocessor Addressing modes The G65SC816 is capable of directly addressing 16 MBytes of memory.
The "long" addressing modes may be used with the G65SC802; however, the high byte of the address is not available to the hardware.
Direct Indexed Indirect -- (d,x) This address mode is often referred to as Indirect X The second byte of the Instruction is added to the sum of the Direct Register and the X Index Register.
oregonstate.edu /~robinsfr/docs/emu/SNES/ADDRMODE.TXT   (1484 words)

  
 Pixel Addressing
With a Pixel Addressing value of 1, the Pixel Addressing mode has no effect and all pixels in the ROI will be returned.
The resampling mode uses a different approach involving the conversion of the Bayer pattern in the blocks to RGB pixels.
With a Pixel Addressing mode of 2 or more, resampling will convert the block of 10-bit pixels to one 30-bit RGB pixel by averaging the red, green and blue channels.
www.pixelink.com /support/oem/cameras/common_to_firewire/programmable_features/pixel_addressing.htm   (554 words)

  
 The 68000
Address Register Indirect (ARI) with postincrement uses an Address Register to hold the address of the data being either written to or read from memory, but after the instruction is complete, the address register's value is incremented by either 1, 2, or 4.
Address Register Indirect (ARI) with predecrement, as with the other ARI modes, uses an Address Register to hold the address of the data being either written to or read from memory.
Address Register Indirect (ARI) with displacement mode specifies a 16 bit displacement that is added to the value in the address register before memory is referenced to calculate either the destination or source effective address.
www.coe.uncc.edu /~sjkuyath/MC68000/am1.htm   (1088 words)

  
 Chapter 13 - Addressing Modes
Addressing modes on the MC68000 are usually specified in the first 12 bits of the 68000 instruction word.
In this case it is mode = 000 to indicate a data register and register = 3 = 011 to indicate D3.
Whether an absolute addressing mode is long or short is usually assigned by the assembler.
www.cwru.edu /cse/eeap/282/13_addr_modes.html   (953 words)

  
 [No title]
Direct addressing: code = 011 111, assembler symbol = X In direct mode, the address of the data is held in the word following the instruction code.
Zero address machines use a stack for storing data, and operations are performed on the top few stack entries, and the result is left on top of the stack.
In three address machines, the result of performing an operation on data referenced by two addresses is placed in the word at the third address.
web.onetel.com /~hibou/comp-org/lec14.txt   (1112 words)

  
 ECE 272 Laboratory - Lab 4
An addressing mode is the means by which the computer selects the data that is used in an instruction.
The addressing mode is determined by the syntax %eax with which you specify the instruction's operand.
In indexed addressing the 8086 uses the contents of a register along with a constant to compute the memory address of the data.
www.parl.clemson.edu /ullab/ece272/lab4/lab4.html   (1993 words)

  
 The Basics:What is Real Mode?
To maintain backwards compatibility, the processor starts operating in real mode (using real mode addressing) but the processor state may be changed to a different mode (normally protected mode) using whatever the appropriate mechanism.
System Management Mode Addressing is only available when running in system management mode, and that in turn is enabled by asserting a signal on the appropriate pin for the IA-32 CPU (assuming your version supports System Management Mode, of course).
Real Mode is the execution mode of the IA-32 CPU when real mode addressing is being used.
www.osronline.com /article.cfm?article=225   (424 words)

  
 Addressing Modes
Addressing modes are the ways how architectures specify the address of an object they want to access.
The major question for displacement-style addressing mode is that of the range of displacement used.
The impact of the size of the register and addressing mode fields on the average instruction size and hence on the average program size.
www.cs.iastate.edu /~prabhu/Tutorial/PIPELINE/addressMode.html   (332 words)

  
 Lecture notes - Chapter 10 - Pentium Architecture
It is the way that addresses are formed (within the processor) that differs in the 2 models.
For our implementation, an operand within an instruction that uses this addressing mode could look like [EAX][EDI*2 + 80] The effective address calculated with be the contents of register EDI multiplied times 2 added to the constant 80, added to the contents of register EAX.
Note that from the assembly language it is not clear that a PC relative addressing mode is used.
www.cs.wisc.edu /~smoler/x86text/lect.notes/Pentium.html   (1112 words)

  
 [No title]
This new mode allows direct access to up to 128 megabytes of standard RAM or up to one gigabyte of extended memory, eliminating the traditional ñeight megabyte barrier.î 32-bit addressing would normally not be possible on the SE/30, II, IIx, and IIcx systems because of the software built into their ROMs.
ñ32-bit addressing modeî means that all 32 bits of each address generated by the processor are interpreted by the Macintosh to be part of the address.
The advantage of 24-bit addressing mode is that it is compatible with the full range of Macintosh software, whereas only ñ32-bit cleanî applications and INITs will run in the more powerful 32-bit mode.
www.lowendmac.com /daystar/download/documents/68030_68040/man_mode32.txt   (2149 words)

  
 [No title]
This is not an exhaustive permutation of addressing modes and instructions; it is merely intended to illustrate the syntax for all possible addressing modes in each instruction group.
For the Indexed addressing modes, this is done by setting the "indirect" bit in the postbyte.
Both of these words take an absolute address, and compute the relative offset from the branch instruction; the short or long form of the branch is then automatically chosen.
www.zetetics.com /bj/papers/6809asm.txt   (1739 words)

  
 A 2D Addressing Mode for Multimedia Applications   (Site not responding. Last check: 2007-10-08)
To increase the data throughput, we define a new data storage facility with a specific data organization and a new addressing mode.
Furthermore, we propose such an addressing approach, as an architectural feature and we believe it has useful properties that may position it as a basic addressing mode in future multimedia architectures.
In addition, we propose an instruction set extension, utilizing the advantages of this addressing mode, as means of improving the computational power of a general-purpose super-scalar processor.
einstein.et.tudelft.nl /~george/publications/Conf/SAMOS/AbstSAMOS02.html   (228 words)

  
 Addressing Mode Selection
Many processor architectures provide a set of addressing modes in their address generation units.
The selection of he optimal addressing modes in the means of minimal code size and minimal execution time depends on many parameters and is NP complete in general.
In our experiments we show hat the addressing mode selection can be optimally solved for almost all benchmark programs and the compile-time overhead of the address mode selection is within acceptable bounds for a production DSP compiler.
csdl2.computer.org /persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/cgo/2003/1913/00/1913toc.xml&DOI=10.1109/CGO.2003.1191557   (240 words)

  
 The available addressing modes
The only addressing mode that uses an extension word is the indexed mode.
The destination operand in a two-operand instruction has only one addressing mode bit, which selects either register direct or indexed.
r1, the stack pointer, can be used with any addressing mode, but @r1+ always increments by 2 bytes, even on a byte access.
mspgcc.sourceforge.net /manual/x147.html   (292 words)

  
 Lode (TM) DSP Core Datasheet
The lower 8 bits of the data memory address are specified as an 8-bit value in the instruction.
In this mode the memory address is specified in one of the 8 pointer registers r0-r7.
A 16-bit value can be specified in the second word of an instruction and is addressed by the PC as an operand.
www.nalanda.nitc.ac.in /industry/datasheets/atmel/tcsi6.htm   (367 words)

  
 Protected Mode Memory Addressing
The upper limit is set to base address + FFFF (with D=0) or base address + FFFFFFFF (with D=1).
So instead of left shifting by 4 bits in Real Mode to form the segment address, we right shift by 3 bits and use the value as a table index.
is used to reduce the number of actual memory references needed to construct the physical address.
www.cs.umbc.edu /~plusquel/310/slides/micro_arch2.html   (675 words)

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