CISC, RISC, and DSP Microprocessors

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Questions • Why did RISC become commercial in mid/late ‘80s? • Why did CISC survive? • Why have RISC/CISC converged? 4/6/00 CISC, RISC, and DSP D.L. Jones 26
Myth and Reality in RISC vs CISC • Myth: CISC designs were inferior • Reality: CISC designers made good design tradeoffs at each technology point • Myth: Can’t achieve high performance, single-cycle execution with CISC • Reality: They did it! 4/6/00 CISC, RISC, and DSP D.L. Jones 27
Page 1 and 2: CISC, RISC, and DSP Microprocessors
Page 3 and 4: Goals for this Lecture • Understa
Page 5 and 6: • Many addressing modes • Relat
Page 7 and 8: • Wider buses for high-performanc
Page 9 and 10: • Harvard architecture: separate
Page 11 and 12: • Meanwhile, there was RISC ... 4
Page 13 and 14: Arguments Advanced for RISC • Sma
Page 15 and 16: Arguments Advanced for CISC • Few
Page 17 and 18: CISC Processors circa 1999 • Cloc
Page 19 and 20: • Very expensive (100s of dollars
Page 21 and 22: DSP Microprocessors circa 1999 •
Page 23 and 24: Questions • If CISC and RISC have
Page 25: • Market needs in DSP embedded sy
Page 29 and 30: The Real Answer (Opinion!) • The
Page 31 and 32: Implications • These curves STRON
Page 33 and 34: • It wasn’t about RISC at all,
Page 35 and 36: Even More Transistors ... • Then
Page 37 and 38: • This pushed CISC designs to be
Page 39 and 40: Question • Are there other embedd
Page 41 and 42: Future of DSP Microprocessors • D

CISC, RISC, and DSP Microprocessors

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