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.

instruction register

A high-speed circuit that holds an instruction for decoding and execution. See program counter and instruction set.
References in periodicals archive ?
Conversely, a star configuration would necessitate 300 individual instructions, a much-expanded instruction register, and scan paths that were only 2 bits long.
Control instruction register, size 500x200 mm, containing 100 pages.
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.