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Espresso (microprocessor)
Espresso is the codename of the 32-bit central processing unit (CPU) used in Nintendo's Wii U video game console. It was designed by IBM, and is currently being produced using a 45 nm Silicon on insulator process. The Espresso chip resides together with a GPU from AMD on a MCM manufactured by Renesas. It was revealed at E3 2011 in June 2011 and released in November 2012.
== Design ==
IBM and Nintendo have revealed that the Espresso processor is a Power Architecture based microprocessor with three cores on a single chip to reduce power consumption and increase speed. The CPU and the graphics processor are placed on a single substrate as a multi-chip module (MCM) to reduce complexity, increase the communication speed between the chips, further reduce power consumption and reduce cost and space required. The two chips were assembled to the complete MCM by Renesas in Japan.〔(Iwata asks: Wii U: The Console )〕 Espresso itself is manufactured by IBM in its 300 mm plant in East Fishkill, New York, using 45 nm SOI-technology〔(NEW WII U™ ON SOI )〕 and embedded DRAM (eDRAM) for caches.
While unverified by Nintendo, hackers, teardowns, and unofficial informants have since revealed more information about the Espresso, such as its name,〔(World Exclusive: Wii U Final Specs )〕 size〔(Nintendo Wii U Teardown - AnandTech.com )〕〔(Nintendo Wii U Teardown - iFixit.com )〕 and speed.〔(Wii U has 1.24GHz CPU, 550MHz graphics core )〕〔(Wii U CPU, GPU Details Uncovered )〕 The microarchitecture seems to be quite similar to its predecessors the Broadway and Gekko, i.e. PowerPC 750 based, but enhanced with larger and faster caches and multiprocessor support.
Rumors that the Wii U CPU was derived from IBM's high end POWER7 server processor proved false. Espresso shares some technology with POWER7, such as eDRAM and Power Architecture, but those are superficial similarities.〔(IBM puts Watson's brains in Nintendo Wii U )〕〔(IBM teases on Wii U CPU specs )〕〔(Rumored Wii U Specs Raising Eyebrows... for the Wrong Reasons )〕〔(IBM reconfirms the Wii U/Watson connection )〕〔(IBM Confirms WII U Utilizes Power-Based CPU, Not Power 7 )〕
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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