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The e r P C The PowerPC 603 MicroprocessorIn October 1993, Motorola and IBM unveiled the first low-power version of the PowerPC family-the PowerPC 603 microprocessor. Measuring a mere 85mm-(7.4 x 11.5 mm) in size, the 603 contains 1.6 million transistors and consumes less than 3 watts of power when operating at 80MHz. With estimated performance values of 75 SPECInt92 and 85 SPECfp92, the 603 is comparable in performance to present-day high-end personal computer and workstation processors. This member of the PowerPC family is designed to bring high-performance and low-power capabilities to the laptop and low-cost desktop computer markets.

This paper describes the precise exception model of the MC88110 symmetric superscalar microprocessor. The MC88110 is a superscalar, pipelined processor that contains multiple execution units and allows out-of order execution of instructions. The MC88110 implements fully precise exceptions and presents the architecturally correct state to an exception handling routine in a manner that minimizes exception response latency. The interrupt latency timings in the MC88110 are described, and several examples of short and long latencies are provided.

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