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| | Department of Computer Science - PDP-11 - Don S. Bidulock |
 | | In autoincrement mode, at the start of the instruction execution, the register contains the address of the operand, and, after the instruction is executed, the address of the next higher word or byte memory location. | | | The address is decremented by one for bytes, by two for words. | | | In index mode, a base address is added to an index word to produce the effective address of an operand; the base address specifies the starting location of table or list. |
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http://pages.cpsc.ucalgary.ca/~dsb/PDP11/AddrModes.html
(2179 words)
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| | ECE 272 Laboratory - Lab 4 |
| | An addressing mode is the means by which the computer selects the data that is used in an instruction. | | | In indexed addressing the 8086 uses the contents of a register along with a constant to compute the memory address of the data. | | | The contents of a register along with a constant are used to compute the memory address of the data. |
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http://www.parl.clemson.edu/ullab/ece272/lab4/lab4.html
(1993 words)
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| | [No title] |
| | 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. | | | Direct Indirect Indexed -- (d),y This address mode is often referred to as Indirect,Y. The second byte of the instruction is added to the Direct Register (D). | | | Stack Relative -- d,s The low-order 16 bits of the effective address is formed from the sum of the second byte of the instruction and the Stack Pointer. |
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http://oregonstate.edu/~robinsfr/docs/emu/SNES/ADDRMODE.TXT
(1484 words)
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| | Chapter 13 - Addressing Modes |
| | An addressing mode tells the computer where to get/place a number. | | | where xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx is a 32-bit binary address indicating the value of LABEL and is used as the address of the data to be used in the ADD. | | | MOVE.W #$452,D0 ;moves the number $452 to D0 MOVE.L #I,D0 ;moves the value of I ;(the address in the symbol table) ;into D0 as a number ADDI.W #%1011,D0 ;add the binary constant 1011 (13) ;to the contents of D0 MOVE.L I,D0 ;move the contents of the ;memory location I into D0. |
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http://www.cwru.edu/cse/eeap/282/13_addr_modes.html
(953 words)
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| | 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. | | | The amount by which the address register is decremented is based on the data size (i.e.; 1 for Byte, 2 for Word, 4 for Longword). | | | Immediate mode is used when the data is known, or is a constant, in the program. |
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http://www.coe.uncc.edu/~sjkuyath/MC68000/am1.htm
(1088 words)
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| | Art of Assembly: Chapter Four-3 |
| | Following the opcode is the addressing mode byte, affectionately called the "mod-reg-r/m" byte by most programmers. | | | The 80386 computes the effective address by adding disp, base, and index*n together. | | | For programmers working on the 80386 processor, there is always the temptation to skip the 8086 addressing modes and use the 80386 set exclusively. |
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http://webster.cs.ucr.edu/AoA/DOS/ch04/CH04-3.html
(2253 words)
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| | VAX MACRO and Instruction Set Reference Manual |
| | Table 8-5 is a summary of general register addressing and Table 8-6 is a summary of PC addressing. | | | The assembler notation for byte and word branch displacement addressing is A, where A is the branch address. | | | If the effective address is in memory, the address is returned in a longword that is the actual instruction operand. |
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http://www.cuis.edu/doc_vms_html/000000/731final/4515/4515pro_015.html
(1308 words)
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| | [No title] |
| | The value of the top-of-stack pointer is the address in the block of memory where the value currently on the top of the stack is stored. | | | The value has been added at a lower address than the value that was previously on the top of the stack, and therefore, the stack is seen as growing down in memory. | | | The contents of a stack consist of the data values that reside in memory between the address referenced by the top-of-stack variable and the last memory location in the block. |
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http://www.sce.carleton.ca/courses/94201/f01/94201.notes16-18-indirect-stacks.doc
(1660 words)
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| | [No title] |
| | 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. | | | One Address Instruction Format A number of instructions on the PDP-11 specify only one address in their instruction codes. | | | In addition to zero address instructions, zero address machines have branch instructions and PUSH instructions. |
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http://web.onetel.com/~hibou/comp-org/lec14.txt
(1112 words)
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| | Addressing Modes |
| | Accessing using a pointer or a computed address | | | May be applied to any base addressing mode in some machines. | | | A desire to have instructions encode into lengths that are easy to handle in the implementation (multiples of bytes, fixed-length) with possible sacrificing in average code size. |
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http://www.cs.iastate.edu/~prabhu/Tutorial/PIPELINE/addressMode.html
(332 words)
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| | NeXT |
| | One can also use the stack pointer (syntax "sp" or "a7"); however, you should keep in mind that this is the processor stack pointer, so you have to make sure, when changing it, that you don't lose some useful information that was on the stack. | | | In this example, the byte that is stored in the memory location pointed to by register a0 is stored into the least significant byte of register d0; then, register a0 is incremented by one. | | | It will be up to the assembler-linker-loader team to decide where this memory location will be, but you can be sure that by the time the program is executed, the right address will have been put in place of label "var" in the "movel" statement. |
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http://www.cs.mcgill.ca/~cs573/fall2002/notes/next/chap3.html
(1489 words)
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| | The Basics:What is Real Mode? |
| | For example, instructions are fetched from memory by combinging the CS register (code segment) and the IP register (instruction pointer). | | | This works because the linear address is computed by combining these two values: | | | Indeed, the way that modern Windows makes older Real Mode programs work is by using "virtual 8086" machines that provide a separate execution environment - a virtual CPU. |
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http://www.osronline.com/article.cfm?article=225
(424 words)
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| | A 2D Addressing Mode for Multimedia Applications |
| | 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. | | | To increase the data throughput, we define a new data storage facility with a specific data organization and a new addressing mode. | | | This paper discusses architectural solutions that deal with the high data throughput and the high computational power - two crucial performance requirements of MPEG standards. |
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http://einstein.et.tudelft.nl/~george/publications/Conf/SAMOS/AbstSAMOS02.html
(228 words)
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| | Lecture notes - Chapter 10 - Pentium Architecture |
| | 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. | | | This is much of the reason that Intel chose this form of memory model for its earliest single-chip processors. | | | -- base-indexed mode -- (Intel's name) The effective address is the sum of the contents of two registers. |
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http://www.cs.wisc.edu/~smoler/x86text/lect.notes/Pentium.html
(1112 words)
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| | [No title] |
| | 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. | | | These instructions use 6x for Indexed mode, and 7x for Extended, so the assembler assumes a "base opcode" of 4x, and adds 10, 20, or 30 hex. | | | The relative offset is computed, and the "long branch" form of the instruction is used if necessary. |
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http://www.zetetics.com/bj/papers/6809asm.txt
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| | Addressing Mode Selection |
| | 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. | | | For example DSPs (digital signal processors) have powerful addressing modes for efficiently implementing numerical algorithms. |
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http://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)
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| | Lode (TM) DSP Core Datasheet |
| | The lower 8 bits of the data memory address are specified as an 8-bit value in the instruction. | | | A 16-bit value can be specified in the second word of an instruction and is addressed by the PC as an operand. | | | These two values are concatenated to generate a 16-bit memory address. |
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http://www.nalanda.nitc.ac.in/industry/datasheets/atmel/tcsi6.htm
(367 words)
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| | ADDRESSING MODES OF 8086 |
| | This instruction means input the data from the byte-wide input port at address 15 of the I/O address space to register AL. | | | If a source operand is part of the instruction instead of the contents of a register or memory location, it represents what is called the immediate operand and is accessed using immediate addressing mode. | | | Immediate operands can be either a byte or word of data. |
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http://www.ece.unh.edu/courses/ece707_4/am8086.htm
(575 words)
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| | I2C Bus Extended Addressing |
| | This scheme insures that the 10 bit addressing mode stays completely transparent for the other devices on the bus. | | | The second byte contains the 8 LSB's of the address. | | | Any new design should implement this new addressing scheme. |
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http://www.esacademy.com/faq/i2c/general/i2cexten.htm
(116 words)
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| | Protected Mode Memory Addressing |
| | is used to reduce the number of actual memory references needed to construct the physical address. | | | Let's first consider how LDTs are used to extend the address space of individual tasks. | | | An LDT can optionally be defined on a per-task basis and is used to expand the addressable range of the task. |
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http://www.cs.umbc.edu/~plusquel/310/slides/micro_arch2.html
(675 words)
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| | [No title] |
| | Which mode you should use depends on how much memory you need. | | | Just reboot, holding down the ESC key (to temporarily switch to 24-bit mode) and start looking for the incompatible software. | | | Such software usually causes your system to crash immediately when run in 32-bit mode. |
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http://www.lowendmac.com/daystar/download/documents/68030_68040/man_mode32.txt
(2149 words)
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| | Codegurus.be - About RIP relative addressing (x64 / x86-64 / AMD64 / EM64T / AA-64) |
| | In 64-bit mode the segment operands are ignored and if you encode multiple REX bytes (see the AMD64/EM64T manuals) only the last REX byte is taken into account, so if you write a disassembler or if you are writing a program to emulate/protect/encrypt 64-bit executables, you need to take this behaviour into account. | | | I've got good news and bad news for you, YASM supports RIP relative addressing but at the moment isn't able to produce object files we can use to create a PE+ file. | | | The maximum size of an instruction taking all operand etc into account is 15 bytes (atleast that's what I read in the AMD64 programmer's manual). |
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http://www.codegurus.be/codegurus/Programming/riprelativeaddressing_en.htm
(1062 words)
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| | LostCircuits BBS |
| | In other applications this addressing scheme will not provide any benefits, because, instead of moving to new data, you would have to hop back to the old data first and then move on. | | | Intel goes on to say that further enhancing the addressing capabilities, FSB address bits A[19] and A[20] are also employed and used for rank selection on the memory channel. | | | Using a 256MBx16, 8KB page size memory module as an example, Intel claims that in 'linear' mode only one page can be opened per bank (4 pages per ROW or Rank) Switching between banks causes the memory controller to have to close and open mulitiple pages. |
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http://www.lostcircuits.com/discus/messages/75/2051.html?1074388666
(3634 words)
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| | Pixel Addressing |
| | For example, a Pixel Addressing value of 2 will result in ¼ of the pixels. | | | Unlike binning with CCD sensors, this summation occurs after the image is digitized so no increase in sensitivity will be noticed but a dark image will appear brighter. | | | For Pixel Addressing values greater than 1, the number of pixels will be reduced by the square of the value. |
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http://www.pixelink.com/support/oem/cameras/common_to_firewire/programmable_features/pixel_addressing.htm
(554 words)
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| | The available addressing modes |
| | Operand addresses are computed in a simple, sequential way. | | | r1, the stack pointer, can be used with any addressing mode, but @r1+ always increments by 2 bytes, even on a byte access. | | | The extension word is used as the address directly. |
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http://mspgcc.sourceforge.net/manual/x147.html
(292 words)
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| | Configuring Keil PK51 Tools to Support 24-Bit Contiguous Addressing Mode - Maxim/Dallas |
| | The Keil Software C51 development tool can be configured to support the contiguous addressing mode of these microcontrollers. | | | Dallas Semiconductor microcontroller, DS80C390, DS80C400, 8051, 8-bit microcontrollers, extended addressing mode, contiguous addressing mode, extended memory, Keil C51 PK51, Keil Software, uVision2, linker, startup file | | | The application note examines customizing startup and initialization code using Keil uVision2 software. |
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http://www.maxim-ic.com/appnotes.cfm?appnote_number=606
(146 words)
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| | Virtual machine architecture independent program loader (EP0342362B1) |
| | In a virtual machine operating system running on a computer belonging to a family of computers having different architectures, a method of loading a program which may have first or second addressing widths in a virtual machine running on said computer comprising the steps of: | | | A program loader for virtual machine (VM) operating systems (OS) for computer and data processing systems permits the loading and execution of programs in different virtual machine environments, depending on addressing and residency requirements of the programs. | | | if the residency mode has an attribute corresponding to any addressing width and the addressing mode has an attribute corresponding to said second addressing width or any addressing width, loading the program in an address space above said predetermined address limit if sufficient memory is available (220). |
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http://www.delphion.com/details?pn=EP00342362B1
(255 words)
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| | The page cannot be found |
| | The page you are looking for might have been removed, had its name changed, or is temporarily unavailable. | | | If you reached this page by clicking a link, contact the Web site administrator to alert them that the link is incorrectly formatted. | | | Make sure that the Web site address displayed in the address bar of your browser is spelled and formatted correctly. |
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http://www.absoluteastronomy.com/encyclopedia/a/ad/addressing_mode.htm
(121 words)
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| | [No title] |
| | 8B0473 ¡Â . \ ! ª % * ´ , . = $ , ªP M ? J & ó 3 © ¨ Direct Addressing ¨ Offset (i.e., effective address) is specified as part of the instruction The assembler replaces variable names by their offset values during the assembly process Useful to access only simple variables Example total_marks = assign_marks + test_marks + exam_marks translated into mov EAX,assign_marks add EAX,test_marks add EAX,exam_marks mov total_marks,EAX ¡¾ J P Y P ' Z n ; Z | | | 8B0473 Example 3: Address and data size override mov EAX,[EBX*ESI+2] ==> 66 | | | B8 0000007B Example 2: Address size override mov AX,[EBX*ESI+2] ==> 67 |
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http://www.scs.carleton.ca/~sivarama/asm_book/asm2ed_slides/slides/al2ed_chapter6.ppt
(1185 words)
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| | Addressing mode in C++ - Dev Shed |
| | Addressing mode in C++ C programming forum discussing all C derivatives, including C#, C++, Object-C, and even plain old vanilla C. These languages are low level languages, and used on projects such as device drivers, compilers, and even whole computer operating systems. | | | Viewing: Dev Shed Forums > Programming Languages > C Programming > Addressing mode in C++ | | | Discuss Addressing mode in C++ in the C Programming forum on Dev Shed. |
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http://forums.devshed.com/c-programming-42/addressing-mode-in-c-131691.html
(200 words)
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