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The IBM RISC System/6000 processor: Hardware overview

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3 Author(s)
Bakoglu, H.B. ; IBM Advanced Workstations Division, 11400 Burnet Road, Austin, Texas 78758, USA ; Grohoski, G.F. ; Montoye, R.K.

A highly concurrent superscalar second-generation family of RISC workstations and servers is described. The RISC System/6000* family is based on the new IBM POWER (Performance Optimization With Enhanced RISC) architecture; the hardware implementation takes advantage of this powerful RISC architecture and employs sophisticated design techniques to achieve a short cycle time and a low cycles-per-instruction (CPI) ratio. The RS/6000 CPU features multiple-instruction dispatch, multiple functional units that operate concurrently, separate instruction and data caches, and zero-cycle branches. In this superscalar implementation, at a given cycle the equivalent of five operations can be executed simultaneously (a branch, a condition-register operation, and a floating-point multiple-add). The RS/6000 family supports the IBM Micro Channel architecture as well as high-speed serial optical links to provide a high-bandwidth I/O subsystem.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:34 ,  Issue: 1 )