instruction register


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instruction register

[in′strək·shən ‚rej·ə·stər]
(computer science)
A hardware element that receives and holds an instruction as it is extracted from memory; the register either contains or is connected to circuits that interpret the instruction (or discover its meaning). Also known as current-instruction register.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

instruction register

A high-speed circuit that holds an instruction for decoding and execution. See program counter and instruction set.
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References in periodicals archive ?
The means hazard occurs when the target instruction register (target operand) at the execution stage combines with any third row instruction's source register (source target) in the decode stage.
Conversely, a star configuration would necessitate 300 individual instructions, a much-expanded instruction register, and scan paths that were only 2 bits long.
The allowable use of ZBSs can only begin after a Test-Logic-Reset because this state initializes the instruction registers with either the BYPASS or IDCODE instructions.
As an example, the initial task in debugging illegal memory reference errors is to decode the offending instruction and determine the area of memory that instruction registers are referencing.