SH-2
From Sega Retro
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| SH-2 |
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| 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.
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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. |
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— Next Generation [3] | ||
Technical specifications
- Clock rate: 28.63636 MHz[4][5][6]
- CPU core: 32‑bit RISC instructions/registers, 37.227268 MIPS (1.3 MIPS per MHz),[1][2] up to 2 instructions per cycle[7]
- DMA unit: DMAC (Direct Memory Access Controller),[8] parallel processing[9]
- 2 internal fixed‑point math processors:[10] MULT multiplier DSP,[8][11][12] DIVU division unit,[8][11] parallel processing[13]
- 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
Hardware manual
Programming manual
Programming manual
Footnotes
References
- ↑ Jump up to: 1.0 1.1 File:SH-2A.pdf, page 2
- ↑ Jump up to: 2.0 2.1 SH7040, SH7041, SH7042, SH7043, SH7044, SH7045, Renesas
- ↑ Next Generation, "February 1995" (US; 1995-01-24), page 42
- ↑ Sega Saturn hardware notes (2004-04-27)
- ↑ File:Hitachi SuperH Programming Manual.pdf
- ↑ File:SH7604 Hardware Manual.pdf
- ↑ File:Hitachi SuperH Programming Manual.pdf, page 390
- ↑ Jump up to: 8.0 8.1 8.2 File:SH7604 Hardware Manual.pdf, page 3
- ↑ File:SH7604 Hardware Manual.pdf, page 219
- ↑ File:Sega Service Manual - Sega Saturn (PAL) - 013-1 - June 1995.pdf
- ↑ Jump up to: 11.0 11.1 File:SH7604 Hardware Manual.pdf, page 22
- ↑ File:ST-103-R1-040194.pdf, page 23
- ↑ Jump up to: 13.0 13.1 File:SH7604 Hardware Manual.pdf, page 303
- ↑ File:Hitachi SuperH Programming Manual.pdf, page 31
- ↑ File:Hitachi SuperH Programming Manual.pdf, page 155
- ↑ File:ST-103-R1-040194.pdf