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Godson-2G - Loongson
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Godson-2G
godson-2g.jpg
Godson-2G chip
General Info
DesignerLoongson
ManufacturerSTMicroelectronics
Model Number2G
MarketDesktop
IntroductionApril, 2009 (announced)
November, 2010 (launched)
General Specs
FamilyGodson 2
SeriesGodson 2
Frequency1,000 MHz
Bus typeHyperTransport 1.0
Bus speed400 MHz
Clock multiplier2.5
Microarchitecture
ISAMIPS64 (MIPS)
MicroarchitectureGS464
Core NameGS464
Process65 nm
Transistors100,000,000
TechnologyCMOS
Die53.54 mm²
Word Size64 bit
Cores1
Threads1
Multiprocessing
Max SMP1-Way (Uniprocessor)
Electrical
Power dissipation3 W

Godson-2G (龙芯2G) is a 64-bit MIPS performance processor developed by ICT and later Loongson for desktop computers. Introduced in late-2010, the Godson-2G operates at up to 1 GHz consuming up to 3 W. This chip was manufactured on STMicroelectronics' 65 nm process.

This specific models incorporates a considerably larger 2nd level cache compared to the rest of the Godson 2 family along with an extended number of additional interfaces in a relatively large package. The Godson-2G integrates the majority of the southbridge on-die.

Cache[edit]

Main article: GS464 § Cache

[Edit/Modify Cache Info]

hierarchy icon.svg
Cache Organization
Cache is a hardware component containing a relatively small and extremely fast memory designed to speed up the performance of a CPU by preparing ahead of time the data it needs to read from a relatively slower medium such as main memory.

The organization and amount of cache can have a large impact on the performance, power consumption, die size, and consequently cost of the IC.

Cache is specified by its size, number of sets, associativity, block size, sub-block size, and fetch and write-back policies.

Note: All units are in kibibytes and mebibytes.
L1$128 KiB
0.125 MiB
131,072 B
1.220703e-4 GiB
L1I$64 KiB
0.0625 MiB
65,536 B
6.103516e-5 GiB
1x64 KiB4-way set associative 
L1D$64 KiB
0.0625 MiB
65,536 B
6.103516e-5 GiB
1x64 KiB4-way set associative 

L2$1 MiB
1,024 KiB
1,048,576 B
9.765625e-4 GiB
  1x1 MiB4-way set associative 

Memory controller[edit]

[Edit/Modify Memory Info]

ram icons.svg
Integrated Memory Controller
Max TypeDDR3-800
Supports ECCYes
Max Mem4 GiB
Controllers1
Channels1
Max Bandwidth11.92 GiB/s
20.741 GB/s
12,206.08 MiB/s
0.0116 TiB/s
0.0128 TB/s
Bandwidth
Single 11.92 GiB/s

Expansions[edit]

This chip has integrated HyperTransport 1.0 operating at 400 MHz.

[Edit/Modify Expansions Info]

ide icon.svg
Expansion Options
PCI
Width32 bit
Clock66 MHz
PCI-X
Width32 bit
Clock133 MHz
LPC
Revision1.1


Die Shot[edit]

godson-2g die shot.png

References[edit]

  • Zhao, Ji-Ye, et al. "Physical Design Methodology for Godson-2G Microprocessor." Journal of Computer Science and Technology 25.2 (2010): 225-231.
  • Weiwu Hu, Yunji Chen. "GS464V: A High-Performance Low-Power XPU with 512-Bit Vector Extension". HotChips 22 (2010).
  • Loongson Technology, "龙芯芯片产品技术白皮书" ("Godson chip product technology white paper")
Facts about "Godson-2G - Loongson"
base frequency1,000 MHz (1 GHz, 1,000,000 kHz) +
bus speed400 MHz (0.4 GHz, 400,000 kHz) +
bus typeHyperTransport 1.0 +
clock multiplier2.5 +
core count1 +
core nameGS464 +
designerLoongson +
die area53.54 mm² (0.083 in², 0.535 cm², 53,540,000 µm²) +
familyGodson 2 +
first announcedApril 2009 +
first launchedNovember 2010 +
full page nameloongson/godson 2/2g +
has ecc memory supporttrue +
instance ofmicroprocessor +
isaMIPS64 +
isa familyMIPS +
l1$ size0.125 MiB (128 KiB, 131,072 B, 1.220703e-4 GiB) +
l1d$ description4-way set associative +
l1d$ size0.0625 MiB (64 KiB, 65,536 B, 6.103516e-5 GiB) +
l1i$ description4-way set associative +
l1i$ size0.0625 MiB (64 KiB, 65,536 B, 6.103516e-5 GiB) +
l2$ description4-way set associative +
l2$ size1 MiB (1,024 KiB, 1,048,576 B, 9.765625e-4 GiB) +
ldateNovember 2010 +
main imageFile:godson-2g.jpg +
main image captionGodson-2G chip +
manufacturerSTMicroelectronics +
market segmentDesktop +
max cpu count1 +
max memory bandwidth11.92 GiB/s (20.741 GB/s, 12,206.08 MiB/s, 0.0116 TiB/s, 0.0128 TB/s) +
max memory channels1 +
microarchitectureGS464 +
model number2G +
nameGodson-2G +
power dissipation3 W (3,000 mW, 0.00402 hp, 0.003 kW) +
process65 nm (0.065 μm, 6.5e-5 mm) +
seriesGodson 2 +
smp max ways1 +
supported memory typeDDR3-800 +
technologyCMOS +
thread count1 +
transistor count100,000,000 +
word size64 bit (8 octets, 16 nibbles) +