SH-2

From Sega Retro

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SH-2
Designer: Hitachi

The SH-2 is a 32-bit RISC processor developed by Hitachi (and currently produced by Renesas) as part of the SuperH family. It is used by the Sega 32X and the Sega Saturn.


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The Sega Saturn is powered by two SH-2 processors running in a Master/Slave configuration. These particular SH-2 chips run at 28.6364 MHz (versions were developed which ran as high as 40 MHz), and are capable of processing up to 37.227268 MIPS each (1.3 MIPS per MHz),[1][2] for a combined rating of 74.45464 MIPS (MIPS however, is not a true indication of processor performance in many cases). Each SH-2 comes with an internal 4 KB RAM cache in order to speed up processing tasks.


The SH-2 is a small (2 cm square) but fast RISC chip that has been designed primarily to process graphics. Like all RISC processors, it's more streamlined that conventional CISC-based chips and carries out instructions in far fewer clock cycles.

— Next Generation [3]


Technical specifications

  • 2x MULT multiplier DSP: 57.27272 MOPS[fn 1] fixed-point math (28.63636 MOPS per SH-2)[fn 2]
  • 2x DIVU division units: 16/32/64-bit division,[13] 1,468,531 divides/sec[fn 3]
  • Bus width: 64‑bit (2× 32‑bit) internal, 32‑bit external[16]
  • Word length: 32-bit
  • Supports Master/Slave configuration with dual SH-2

Documentation

Footnotes

  1. [MOPS (million operations per second) MOPS (million operations per second)]
  2. [1 operation per cycle[14] 1 operation per cycle[14]]
  3. [39 cycles per divide[15] 39 cycles per divide[15]]

References