Difference between revisions of "Loongson"

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Loongson 2F is the latest processor in Loongson 2 Family. Also manufactured by STMicroelectronics.
 
Loongson 2F is the latest processor in Loongson 2 Family. Also manufactured by STMicroelectronics.
  
It is identical to the Loongson 2E with several improvments:
+
It is identical to the Loongson 2E with several improvements:
  
 
* Higher Clock Frequency: 1.2GHz maximum
 
* Higher Clock Frequency: 1.2GHz maximum
 
* Advanced power control technology: less than 6 Watt under 1GHz in the same 90nm
 
* Advanced power control technology: less than 6 Watt under 1GHz in the same 90nm
* Intergrated DDR2 controller
+
* Integrated DDR2 controller
* Intergrated northbridge providing faster IO (compared with former PCI bus) with PCI-X 66 bus
+
* Integrated northbridge providing faster IO (compared with former PCI bus) with PCI-X 66 bus
 
* Smaller Packaging.
 
* Smaller Packaging.
  

Revision as of 11:52, 1 September 2010

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Loongson 2E

Loongson 2E was designed by ICT (Institute of Computing Technology), a department of The Chinese Academy of Sciences, helped and manufactured by STMicroelectronics.

ST Generic Part Number: STLS2E02

Features

Microarchitecture:

  • 64 bit
  • 9 pipeline stages
  • 4-issue Out-Of-Order Executive
  • 2 ALU, 2 FALU, 1 SIMD, 1 Load/Store Units

ISA: MIPSIII

Cache: 64KB L1 date, 64KB L1 instruction, on-chip 512KB L2.

Clock Frequency: 600MHz - 800MHz.

TDP: 4 Watt at 700MHz

Integrated: DDR-333 memory controller.


Highlights

ST's Leading Edge 90nm process.

Some new instructions: Allow write to register directly without MFLO or MFHI.

Some new instructions: MADD.[S|D] MSUB.[S|D] NMADD.[S|D] NMSUB.[S|D].

Some new SIMD instructions: simmilar to MMX, using FPU for parallel fix-point arithmetic.

An Execution bit: help OS to protect from buffer-flow attack.

Devices based on this CPU

Processor documentation

Chinese version

English version

Loongson 2F

Loongson 2F is the latest processor in Loongson 2 Family. Also manufactured by STMicroelectronics.

It is identical to the Loongson 2E with several improvements:

  • Higher Clock Frequency: 1.2GHz maximum
  • Advanced power control technology: less than 6 Watt under 1GHz in the same 90nm
  • Integrated DDR2 controller
  • Integrated northbridge providing faster IO (compared with former PCI bus) with PCI-X 66 bus
  • Smaller Packaging.

Devices based on this CPU

Processor documentation

Chinese version

English version

Optimizing GNU/Linux distributions for loongson2f

Loongson2f software works considerably faster if compiled with the correct flags. Also some flags are required to work around processor bugs early in the production runs.

Contributing

See also