Difference between revisions of "Loongson"

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==Loongson 2F==
 
==Loongson 2F==
 
Loongson 2F is the latest processor in Loongson 2 Family.
 
Loongson 2F is the latest processor in Loongson 2 Family.
 +
 
No improvements from 2E except following points:
 
No improvements from 2E except following points:
-Higher Clock Frequence: 1.2GHz maximum
+
 
-Advanced power control technology: less than 6 Watt under 1GHz in the same 90nm
+
*Higher Clock Frequence: 1.2GHz maximum
-Intergrated DDR2 controller
+
*Advanced power control technology: less than 6 Watt under 1GHz in the same 90nm
-Intergrated northbridge:Faster IO with PCI-X 66 bus(compared with former PCI bus)
+
*Intergrated DDR2 controller
-Smaller Packaging.
+
*Intergrated northbridge:Faster IO with PCI-X 66 bus(compared with former PCI bus)
 +
*Smaller Packaging.

Revision as of 12:02, 24 October 2007

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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 Frequence: 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 Executive bit: help OS to protect from buffer-flow attack.



The following 2F is under manufacture(July,2007) which has a higher frequence, an on-chip DDR2 controller and advanced power control technology.


Devices based on this CPU

Processor documentation

Chinese version

English version

Loongson 2F

Loongson 2F is the latest processor in Loongson 2 Family.

No improvements from 2E except following points:

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