The Emotion Engine is the CPU for Sony's PlayStation 2, developed in a Sony - Toshiba cooperation and introduced in 1999.
Data bus, cache memory as well as all registers are implemented in 128 bit technology, integrated on a single 0.18 micron process technology chip,
making it the first commercial 128 bit CPU.
The Emotion Engine, based on the MIPS R5900, is sort of a combination CPU and DSP processor, whose main function is simulating 3D worlds. It integrated all necessary units on the die:
The MIPS III CPU core, 2 vector units, FPU, image processing unit (basically an MPEG2 decoder with some other capabilities), 10-channel DMA controller,
graphics interface unit, RDRAM and I/O interfaces, all connected via a shared 128-bit internal bus.
References:
Sony announcement
Ars Technica Technical Overview
Die shots
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