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'''Godson 2''' ('''龍芯２''') is a family of {{arch|64}} [[MIPS]] low-power performance desktop processors developed by the [[Institute of Computing Technology of the Chinese Academy of Sciences]] (ICT) in 2003. The Godson 2 processors are now developed by [[Loongson Technology]] (which was co-founded by ICT) and sold as low-power embedded and desktop processors. The Godson 2 is famous for being the first [[Chinese]] developed {{arch|64}} microprocessors as well as the first Chinese processors to break the gigahertz frequency.
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'''Godson 2''' ('''龍芯２''') is a family of {{arch|64}} [[MIPS]] performance desktop processors developed by the [[Institute of Computing Technology of the Chinese Academy of Sciences]] (ICT) in 2003. The Godson 2 processors are now developed by [[Loongson Technology]] (which was co-founded by ICT) and sold as low-power embedded and desktop processors. The Godson 2 is famous for being the first [[Chinese]] developed {{arch|64}} microprocessors as well as the first Chinese processors to break the gigahertz frequency.
  
 
== Overview ==
 
== Overview ==
 
{{main|loongson/microarchitectures/gs464|l1=GS464 µarch}}
 
{{main|loongson/microarchitectures/gs464|l1=GS464 µarch}}
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The Godson 2 family of microprocessors started out in [[2002]] by the [[Institute of Computing Technology of the Chinese Academy of Sciences]] (ICT) after the successful design of the first {{\\|Godson 1}}. The Godson 2 series is based on a more ambitious goal with high efficiency and high performance in mind. Godson 2 processors are designed as general purpose {{arch|64}} [[MIPS64]]-like processors. At the time they were marketed as "MIPS-like" due to not having a proper license from [[MIPS Technologies]]. A number of patented instructions were also omitted from the [[ISA]] for this reason. In August 2011 [[Loongson Technology]] officially licensed the [[MIPS32]] and [[MIPS64]] architectures from [[MIPS Technologies]] allowing them to label the chips as "MIPS-compatible".
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The Godson 2 microprocessors are designed as a general purpose {{arch|64}} that implements a [[MIPS64]]-like instruction set (Note that at the time ICT was not a MIPS licensee). Many improvements were done in Godson over {{\\|Godson 1|its predecessor}} such as a wider pipeline capable of [[instruction fetch|fetching]] and [[instruction decoding|decoding]] four times as many instructions per cycle.
  
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The first Godson 2, model {{\|2B}} which was introduced in 2003, became [[China]]'s first {{arch|64}} microprocessor. This model was fabricated using 6-metal [[0.18 µm process]] using [[CMOS]] technology.
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Initial Godson 2 models were fabricated on a 6-metal [[0.18 µm process]] [[CMOS]] technology using automatic placing and routing. Later models enjoyed a series of [[process shrinks]]. The Godson 2 has integrated additional features over the years from just a CPU to an entire SoC incorporating a [[PCI]]/[[PCIX]] controller, [[memory controller]], [[SPI]]/[[UART]]. Those processors utilized the a [[HyperTransport]] bus for the [[southbridge]]. Most recent models integrated much of the southbridge on-die as well including [[PCIe]], [[SATA]], and a [[USB]] controller as well as multimedia support (GPU, dual display, audio, and media decoders).
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The next few successors introduced incrementally better clock speeds (doubling with each model) along with a larger cache and improved [[branch predictor]]s for triple the performance improvement each time. With the introduction of the {{\|2E}}, ICT reached 1 GHz clock frequency. This was the first such achievement for an entirely Chinese-based design. Those models were all manufactured on [[SMICS]]'s [[0.18 µm process]] as well.
 
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In October 2006, Loongson signed a strategic agreement with [[STMicroelectronics]] to fabricate the Godson chips. Later models started using ST's [[90 nm process]] followed by [[65 nm]].
 
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The introduction of the {{\|2E}} brought about higher integration with the introduction of an on-die [[northbridge]], incorporating a DDR1 memory controller. With the launch of the {{\|2F}} in 2008, ICT improved their integrated memory controller capabilities and started integrating some components of the [[southbridge]] as well ([[HyperTransport]], [[PCI]]/[[PCI-E]]).
 
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In [[2011]] Loongson introduced their first complete [[system-on-chip]], the {{\|2H}}. The chip incorporated both the [[northbridge]], [[southbridge]] (integrating things such as [[PCIe]], [[SATA]], and a [[USB]] controller), and a licensed low-power [[Vivante]] {{vivante|GC800}} GPU. The 2H is based on Loongson's {{\\|GS464V}} architecture which incorporates the [[MIPS SIMD]] extension. The {{\|2G}} can serve as a standalone SoC powering low-power [[nettop]]s and [[tablet]]s or in slave mode, serving as a complete chipset solution to the more power {{\\|Godson 3}} series of processors.
 
  
 
Godson 2 processors can be found in many low end laptops and embedded hardware manufactured by [[Lemote Technology]].
 
Godson 2 processors can be found in many low end laptops and embedded hardware manufactured by [[Lemote Technology]].
 
{{clear}}
 
{{clear}}
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== Members ==
 
== Members ==
 
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<table class="comptable sortable tc12 tc13">
 
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<tr class="comptable-header"><th>&nbsp;</th><th colspan="8">List of Godson-2 Processors</th></tr>
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<tr class="comptable-header"><th>&nbsp;</th><th colspan="12">List of Godson-2 Processors</th></tr>
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<tr class="comptable-header"><th>&nbsp;</th><th colspan="6">Processor</th><th colspan="2">[[IGP]]</th></tr>
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{{comp table header 1|cols=Launched, Process, Frequency, L1$, L2$, Power, Name, Frequency}}
 
 
{{#ask: [[Category:microprocessor models by loongson]] [[instance of::microprocessor]] [[microprocessor family::Godson 2]]
 
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{{comp table count|ask=[[Category:microprocessor models by loongson]] [[instance of::microprocessor]] [[microprocessor family::Godson 2]]}}
 
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Facts about "Godson 2 - Loongson"
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designerInstitute of Computing Technology of the Chinese Academy of Sciences + and Loongson +
first announced2003 +
first launchedOctober 17, 2003 +
full page nameloongson/godson 2 +
instance ofmicroprocessor family +
instruction set architectureMIPS64 +
main designerInstitute of Computing Technology of the Chinese Academy of Sciences +
manufacturerSMICS + and STMicroelectronics +
microarchitectureGS464 +
nameGodson 2 +
process180 nm (0.18 μm, 1.8e-4 mm) +, 90 nm (0.09 μm, 9.0e-5 mm) +, 65 nm (0.065 μm, 6.5e-5 mm) + and 130 nm (0.13 μm, 1.3e-4 mm) +
technologyCMOS +
word size64 bit (8 octets, 16 nibbles) +