Digital's DECchip 21066: The first cost-focused Alpha AXP chip

Dina L. McKinney, Masooma Bhaiwala, Kwong Tak A. Chui, Christopher L. Houghton, James R. Mullens, Daniel L. Leibholz, Sanjay J. Patel, Delvan A. Ramey, Mark B. Rosenbluth

Research output: Contribution to journalArticlepeer-review


The DECchip 21066 microprocessor is the first Alpha AXP microprocessor to target cost-focused system applications and the second in a family of chips to implement the Alpha AXP architecture. The chip is a 0.675-micrometer (μm), CMOS-based, superscalar, superpipelined processor that uses dual instruction issue. It incorporates a high level of system integration to provide best-in-class system performance for low-cost system applications. The DECchip 21066 microprocessor integrates on-chip, fully pipelined, integer and floating-point processors, a high-bandwidth memory controller, an industry-standard PCI I/O controller, graphics-assisting hardware, internal instruction and data caches, and an external cache controller. Cost-saving packaging techniques and an on-chip, analog phase-locked loop enable the chip to meet the cost demands of personal computers and desktop systems. This paper discusses the trade-offs and results of the design, verification, and implementation of the DECchip 21066 microprocessor.

Original languageEnglish (US)
Pages (from-to)66-77
Number of pages12
JournalDigital Technical Journal
Issue number1
StatePublished - Dec 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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