Template:mpu 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 15 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

Main article: GS464 § Cache

[Edit/Modify Cache Info]

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 131,072 B 0.125 MiB L1I$ 64 KiB 65,536 B 0.0625 MiB 1x64 KiB 4-way set associative   L1D$ 64 KiB 65,536 B 0.0625 MiB 1x64 KiB 4-way set associative   L2$ 1 MiB 1,024 KiB 1,048,576 B 9.765625e-4 GiB     1x1 MiB 4-way set associative

Memory controller

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	Integrated Memory Controller
	Max Type DDR3-800 Supports ECC Yes Max Mem 4 GiB Controllers 1 Channels 1 Max Bandwidth 11.92 GiB/s 12,206.08 MiB/s 12.799 GB/s 12,799.003 MB/s 0.0116 TiB/s 0.0128 TB/s Bandwidth Single 11.92 GiB/s

Expansions

This chip has integrated HyperTransport 1.0 operating at 400 MHz.

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	Expansion Options
	PCI Width 32 bit Clock 66 MHz PCI-X Width 32 bit Clock 133 MHz LPC Revision 1.1

Die Shot

• 65 nm process
• 100,000,000 transistors
• 53.54 mm² die size

References

• 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")