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Topic: Instruction register

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	Cash register free support and advice
		You will find an extensive range of questions and answers.
		Please see links below for instructions manuals by various manufacturers.
		Advice on buying a new or second hand cash register.
	www.tillservices.co.uk /discus/messages/board-topics.html (38 words)

	Instruction register - Wikipedia, the free encyclopedia
		In simple processors each instruction to be executed is loaded into the Instruction register which holds it while it is decoded, prepared and ultimately executed, which can take several steps.
		More complicated processors use a pipeline of instruction registers where each stage of the pipeline does part of the decoding, preparation or execution and then passes it to the next stage for its step.
		Decoding the opcode in the instruction register includes determining the instruction, determining where its operands are in memory, retrieving the operands from memory, allocating processor resources to execute the command (in superscalar processors), etc.
	en.wikipedia.org /wiki/Instruction_register (166 words)

	Encyclopedia: Instruction (Site not responding. Last check: 2007-11-04)
		An instruction is a form of communicated information that is both command and explanation for how an action, behavior, method, or task is to be begun, completed, conducted, or executed.
		The types of instruction allowed are defined and determined within the particular platform's instruction set architecture (ISA), which also determines register sources and destination operands, and perhaps an immediate field.
		The size, or "width" of an instruction depends on the architecture of the platform, but it is usually from 4 to 64 (typically, 4, 8, 16, 32, 40, 64) bits wide.
	www.nationmaster.com /encyclopedia/Instruction (1125 words)

	Instruction register (Site not responding. Last check: 2007-11-04)
		In computing, an instruction register is the part of a CPU s control unit that stores an instruction.
		The bit s of the instruction register are decoded by a microprogram that controls the computer.
		Minnesota's National Register Properties Profiles of some properties in the state that are on the National Register of Historic Places, grouped by theme.
	www.serebella.com /encyclopedia/article-Instruction_register.html (402 words)

	Instruction Register
		The instruction register component is used to control all the components.
		It presents the instruction to be executed on the next clock cycle on its output dout and at the next clock cycle, all the components execute the instruction.
		This means that the width of an instruction does not impose limitations on the size of the data path from memory.
	www.ee.ualberta.ca /~rchapman/DFP/instructionregis.html (323 words)

	Pipelining
		When the instruction reaches the WB stage the status is checked (thus ensuring that the status vector of i is checked before that of i+1, since both the instructions take the same amount of stages).
		Latency of an instruction is the number of intervening cycles between an instruction that produces a result and an instruction that uses the result (for example for ALU operations (register-register) the latency is 0 since the next instruction can use the value (using register forwarding)).
		Now if a new instruction is to be scheduled and it is going to write to the register port at the same time as represented by the shift register, then the instruction is delayed by one stall.
	www.cs.rice.edu /~amsaha/Papers/Cexam/notes/node41.html (1561 words)

	Instruction at opensource encyclopedia (Site not responding. Last check: 2007-11-04)
		An instruction is a form of information which is communicated in order to explain how an action, behavior, method, or task is to be begun, completed, conducted, or executed.
		The width of an instruction depends on the architecture of the platform, but it is usually from 4 to 64 bits wide.
		The content of an instruction is determined by the platform's Instruction Set Architecture (ISA), but it usually contains an opcode, which determines the type of instruction, register sources and destination operands, and maybe an immediate field.
	wiki.tatet.com /Instruction.html (210 words)

	instruction register - Hutchinson encyclopedia article about instruction register
		In computing, a special memory location used to hold the instruction that the computer is currently processing.
		It is located in the control unit of the central processing unit, and receives instructions individually from the immediate-access memory during the fetch phase of the fetch-execute cycle.
		This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
	encyclopedia.farlex.com /instruction+register (106 words)

	CSE468 Sp '97: The ALU for an 8-bit processor (Site not responding. Last check: 2007-11-04)
		Instructions are 8 bits wide, and have a primary opcode in the high two bits.
		For register to register instructions, the destination register is given by bit 0, which is also the left-hand member of arithmetic operations, and the second operand is given by bit 1.
		A halt instruction is hidden among the register-to-register instructions.
	www.cs.washington.edu /homes/tressel/cse468/processor_part2.html (464 words)

	Instruction Execution Cycle (Site not responding. Last check: 2007-11-04)
		To finish the cycle, the newly fetched instruction is transferred to the instruction register (IR) and unless told otherwise, the CU increments the PC to point to the next address location in memory.
		This is accomplished by using the contents of the instruction register to decide which circuits are to be activated.
		A register located on the central processing unit which is in turn connected to the data lines of the system.
	www.infocom.cqu.edu.au /Units/win2000/85349/Assessment/Past_Assignments/jonatha1 (2230 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		After referring to the instruction pointer, the next instruction is fetched from memory.
		Instruction Pointer - Holds the address of the next instruction to be executed.
		Memory Data Register (MDR) - holds the actual value of the data that was fetched or is to be stored.
	www.cbu.edu /~mschultz/ITM250/cpuRAM_files/sheet002.htm (227 words)

	CmpSci 635 Lecture 5
		The one register was a register frame pointer and was used as a base to which all other register offsets were added.
		The instruction set and the register set may go through several design iterations -- special registers may be needed to support certain operations such as setting operational modes, and these in turn may require changes to the fields in the register set.
		Instruction types are a particular source of decoding complexity, as the type field must first be decoded before the other fields, which slows the decoding slightly.
	www.cs.umass.edu /~weems/CmpSci635/635lecture5.html (1786 words)

	Assembler Language Reference - mfsri (Move from Segment Register Indirect) Instruction
		Note: The mfsri instruction is supported only in the POWER family architecture.
		The mfsri instruction copies the contents of segment register (SR), specified by bits 0-3 of the calculated contents of the general-purpose register (GPR) RA, into GPR RS.
		The mfsrin (Move from Segment Register Indirect) instruction, mtsr (Move to Segment Register) instruction, mtsrin or mtsri (Move to Segment Register Indirect) instruction.
	www.nersc.gov /vendor_docs/ibm/asm/mfsri.htm (240 words)

	The DLX Instruction Set
		Note that 8 instructions have been added to this version of the instruction set that do not appear in Hennessy and Patterson's text; nor are they listed in "The DLX Instruction Set Architecture Handbook" by Sailer and Kaeli, which otherwise was used as a guideline to the instruction set specification.
		Register 0 has a hardwired {\em zero} value and cannot be modified.
		Note that it defines a struct for each instruction, specifying (1) the mnemonic used by the assembler and disassemblers, (2) the 6 bit opcode value, (3) the value used in the func bits.
	www.ee.byu.edu /ee/class/ee428/labs/DLXinst.html (1223 words)

	8086 Instruction Set (Site not responding. Last check: 2007-11-04)
		A complete listing of all x86 instructions along with usage and encoding information can be found in the NASM Manual (852 KB).
		Divide and multiply instructions are common exceptions to this rule.
		A flag being set to '?' by an instruction indicates that the flag is undefined after the operation.
	www.ee.byu.edu /class/ee425/base/labs/8086InstructionSet.html (1070 words)

	Chapter 5
		Register file has two outputs (contents of two specified sources) and four inputs (3 register numbers plus data for write operation).
		Selection of registers is determined by simply decoding the instruction and using the appropriate fields to select registers from the register file.
		ALU Input 2 - may be a register, the immediate field (for memory access), the constant 4 (for updating the PC) or the sign-extended shifted offset field (for branches).
	www.mines.edu /~crader/cs341/Chapter5.htm (1655 words)

	Addressing system in an information processor - Patent 4031514
		An addressing system according to claim 1, further including a first further register having an input coupled to said data bus and an output coupled to the first input of said adder, for storing the contents of said index register to be added in said adder.
		2, the instruction register 5 forms an operation code at a of bits D0-D6, it forms a function, which determines the state to be transmitted to the detecting circuit 6, at b of bits D7 and D8, and it forms address information, which indicates a displacement, at c of bits D9-D15.
		Subsequently, when new address information is similarly entered into the instruction register 5 again, an address indicated in the displacement of the instruction register 5 is designated with reference to the afore-cited designated address.
	www.freepatentsonline.com /4031514.html (963 words)

	Load and Store Instructions: LDX (Load Index)
		The purpose of this instruction is to load the instruction-address register or an index register with a value.
		The displacement is from the displacement field in the instruction; the value of bit 8 in the instruction is propagated to the left to form the leftmost 8 bits of the word.
		For the long-instruction format, when indirect addressing is not specified, the specified register is loaded with the value in the address field in the instruction.
	www.ibm1130.net /functional/LDXinstr.html (226 words)

	C:\BELLBO~1\COMPSR&E\HTMFILES\00000540.HTM
		When the instruction reference is to an even location, the IBR is loaded with the contents of the next higher odd address after the contents of the even address have been placed in the Storage Register.
		The Address Register, AR, is 15 bits and receives information from the Storage Register, Instruction Backup Register (at the beginning of a storage reference I or E cycle), Index Register, and Index Adder.
		This temporary register holds the tag field of the instruction being executed and is used to select the Index Register being addressed.
	research.microsoft.com /~gbell/Computer_Structures__Readings_and_Examples/00000540.htm (697 words)

	An Implementation of DLX
		Implementing the instruction set requires the introduction of several temporary registers that are not part of the architecture.
		Operation: The ALU performs the operation specified by the opcode on the value in register A and on the value in register B. The result is placed in the register ALUOutput.
		Operation: The ALU performs the operation specified by the opcode on the value in register A and on the value in register Imm.
	www.cs.iastate.edu /~prabhu/Tutorial/PIPELINE/DLXimplem.html (554 words)

	Register and instruction controller for superscalar processor (US6167503)
		An instruction generator, such as a compiler, partitions the instructions into a plurality of sets.
		The plurality of sets are disjoint according to the addresses of the data to be accessed by the instructions while executing in the superscalar computer system.
		Each set of instructions is distributed to the plurality of clusters so that the addresses of the data accessed by the instructions are substantially disjoint among the clusters while immediately executing the instructions.
	www.delphion.com /details?pn=US06167503__ (518 words)

	Microprocessor Tutorial
		This is used to hold the current instruction in the processor while it is being decoded and executed, in order for the speed of the whole execution process to be reduced.
		When an instruction or data is obtained from the memory or elsewhere, it is first placed in the memory buffer register.
		The flag register is specially designed to contain all the appropriate 1-bit status flags, which are changed as a result of operations involving the arithmetic and logic unit.
	www.eastaughs.fsnet.co.uk /cpu/structure-reg.htm (419 words)

	[No title]
		An RR instruction is laid out as follows 1) first 8 bits, the opcode 2) next 4 bits, register one 3) last 4 bits, second register The opcode tells the CPU which instruction is being executed, whether this is an AR, a SR, or somethng else.
		Thus, for example, the instruction AR 3,7 would be encoded as 1A37 The 1A comes from the opcode for AR, 1A.
		The other type of instruction is the register to memory instruction.
	www.wiu.edu /users/mflll/cs310/unit26.html (1032 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		Storage (registers; RAM -- collection of registers) 3.
		Move and transform data between storage elements Example: incrementing the PC -- storage at start and finish is PC register: · Hardware components: · In general, 2 types of hardware components 1.
		RAM: random access memory · Collection of registers · Need address lines to select which register we are going to access · Unlike register, data not always available at the output · Need control signal "memory read" · Variations: 4.
	www.cc.gatech.edu /fac/Ann.Chervenak/3760/lecture1Public.ascii (705 words)

	Instruction spec (8) of PIC16 series
		It moves the contents of the f register to the 1-bit right including the carry bit.
		It executes the subtraction of the contents of the W register from the literal data.
		It executes the subtraction of the contents of the W register from the f register.
	www.hobby-elec.org /e_pic3_9.htm (183 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		The latter "write back" value is fed to the data-in ports of the two copies of the register file in columns 1-2 and 4-5.
		FG: incrementor (of PC register); FF: memory address register The "result bus" is a 3state bus driven by tbufs at the adder, logic unit, MAR mux (PC), and "data in" (from RHS of the 4010) columns.
		One critical path in the above design is from A and B operand registers, through the 32-bit ripple carry adder, through tbufs onto the result bus, and through the register forwarding multiplexor back to the A operand register.
	www3.sympatico.ca /jsgray/20kgates.txt (731 words)

	Comp 255 - Computer Organization - Notes 03
		Micro-coding kept the cost down (the hardware could be simpler), provided flexibility (bugs were easy to correct and new instructions could be added) and the cost of slower individual instruction execution (instructions were interpreted by the micro-code) was offset by faster execution of programs.
		The Instruction Set (of a level) is the set of all instructions available to the programmer at that level.
		RISC or Reduced Instruction Set Computers sometimes called (Reduced Instruction Set Complexity) tend to have fewer instructions or instructions which are less complex.
	userpages.wittenberg.edu /bshelburne/Comp255S/Processors.htm (690 words)

	Microprocessor Project
		If the next instruction needs new data from memory while this data is not available, the compiler can use Nop instruction to delay the execution.
		In the far branch the contents of the register is transferred to the Address bus, while in the near branch only the first 12 bits are transferred with the contents of the CS.
		This Unit fetches either the instruction from the Instruction memory Unit, data from the data memory Unit or Data from IO port.
	www.geocities.com /SiliconValley/Pines/6639/freecir/proc.html (672 words)

	LOOP Instruction (Site not responding. Last check: 2007-11-04)
		The X component specifies the iteration count; the Y component specifies the initial value of the current loop counter register; and the Z component specifies the increment for the current loop counter register.
		This register requires explicit use of the replicate swizzle, that is,.XYZW (RGBA) component masks must be specified.
		The LOOP instruction is provided for iteration, and supports an auto-incremented loop counter register that can be used to index the constant array.
	www.osronline.com /ddkx/graphics/d3denum_6l9j.htm (117 words)

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