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Godson-2F - Loongson
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Godson-2F
godson-2f.jpg
Godson-2F chip
General Info
DesignerLoongson
ManufacturerSTMicroelectronics
Model Number2F
Part NumberPLA80
MarketDesktop
IntroductionJuly 31, 2007 (announced)
June, 2008 (launched)
General Specs
FamilyGodson 2
SeriesGodson 2
Frequency800 MHz
Microarchitecture
ISAMIPS64 (MIPS)
MicroarchitectureGS464
Core NameGS464
Process90 nm
Transistors51,000,000
TechnologyCMOS
Die43 mm²
Word Size64 bit
Cores1
Threads1
Multiprocessing
Max SMP1-Way (Uniprocessor)
Electrical
Power dissipation5 W
Vcore1.2 V

Godson-2F (龙芯2F) is a 64-bit MIPS performance processor developed by ICT and later Loongson for desktop computers. Introduced in mid-2008, the Godson-2F operates at up to 800 MHz consuming 5 W. This chip was manufactured on STMicroelectronics' 90 nm process.

The Godson-2F features a faster memory controller (supporting up to DDR2-667) and integrates some of the functionality of the southbridge including a PCI-X controller and more general-purpose I/O pins.

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$512 KiB
0.5 MiB
524,288 B
4.882812e-4 GiB
  1x512 KiB4-way set associative 

Memory controller[edit]

[Edit/Modify Memory Info]

ram icons.svg
Integrated Memory Controller
Max TypeDDR2-667
Supports ECCYes
Max Mem4 GiB
Controllers1
Channels1
Max Bandwidth9.934 GiB/s
17.285 GB/s
10,172.416 MiB/s
0.0097 TiB/s
0.0107 TB/s
Bandwidth
Single 9.934 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
Revision2.3
Width32 bit
Clock66 MHz
PCI-X
Revision1.0b
Width32 bit
Clock133 MHz
LPC
Revision1.1


Graphics[edit]

This chip had no integrated graphics processing unit.

Die Shot[edit]

godson-2f die shot.png

Datasheet[edit]

References[edit]

  • Hu, Wei-Wu, and Jian Wang. "Making effective decisions in computer architects’ real-world: Lessons and experiences with Godson-2 processor designs." Journal of Computer Science and Technology 23.4 (2008): 620-632.
Facts about "Godson-2F - Loongson"
base frequency800 MHz (0.8 GHz, 800,000 kHz) +
core count1 +
core nameGS464 +
core voltage1.2 V (12 dV, 120 cV, 1,200 mV) +
designerLoongson +
die area43 mm² (0.0667 in², 0.43 cm², 43,000,000 µm²) +
familyGodson 2 +
first announcedJuly 31, 2007 +
first launchedJune 2008 +
full page nameloongson/godson 2/2f +
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$ size0.5 MiB (512 KiB, 524,288 B, 4.882812e-4 GiB) +
ldateJune 2008 +
main imageFile:godson-2f.jpg +
main image captionGodson-2F chip +
manufacturerSTMicroelectronics +
market segmentDesktop +
max cpu count1 +
max memory bandwidth9.934 GiB/s (17.285 GB/s, 10,172.416 MiB/s, 0.0097 TiB/s, 0.0107 TB/s) +
max memory channels1 +
microarchitectureGS464 +
model number2F +
nameGodson-2F +
part numberPLA80 +
power dissipation5 W (5,000 mW, 0.00671 hp, 0.005 kW) +
process90 nm (0.09 μm, 9.0e-5 mm) +
seriesGodson 2 +
smp max ways1 +
supported memory typeDDR2-667 +
technologyCMOS +
thread count1 +
transistor count51,000,000 +
word size64 bit (8 octets, 16 nibbles) +