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Chromatic Research
Chromatic Research Inc. was a company based in Mountain View, California that developed a multifunction multimedia device for PCs called the MPACT! The company was formerly known as Xenon Microsystems Corporation. Chromatic Research, Inc. was founded in 1993. The founders came from Kubota, Showgraphics, Convex and RAMBUS. The hardware technology for the MPACT! was a programmable VLIW and SIMD media processor that implemented a video, audio and modem device. The purpose of the solution was to be a single chip or add-in card that removed the need for separate graphics, audio and modem devices. The MPACT briefly sold as a fully functioning add in card and as a DVD decoder solution.
==The MPACT!==
The architecture of the MPACT! media processor was distinguished in that it used a large addressable SRAM in place of registers, but had 4 special purpose registers for being able to address its 72 bit SRAM entries indirectly (a feature also seen in Intel's Itanium processor). By being based on 9 bit bytes instead of 8 bit bytes, this was the equivalent of adding a sign bit to each byte which is very useful for MPEG decoding. One of the founders was also a founder of RAMBUS, and not surprisingly, the MPACT used RDRAM as its memory technology. The chip could DMA data into contiguous SRAM entries asynchronously with other ALU operations which made the design very parallel and able to absorb the long latencies of RAMBUS's RDRAM while sustaining high throughput.
The MPACT was unlike other fixed functionality hardware solutions in that the hardware only supplied the bare minimum hardware support (the various DACs) along with the MPACT! processor. All of the higher level functionality was handled in software written for the MPACT!. This made the solution highly flexible. So even though the DVD standard was established after the creation of the MPACT!, a decoder solution was developed without impact on the chip design. Similarly, the 56K modem standards were developed after the original MPACT! chip design was completed.
In a press release, the company claimed to make the first device capable of sustaining a billion operations per second (a "BOP"). This feat (remarkable considering that the part ran at 120 MHz) was due in large part to its specialized SIMD MPEG instructions. Similar instructions were eventually added to Intel's MMX x86 instruction set extensions.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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