Soft processor

The soft processor (or a soft-core microprocessor or a software microprocessor) is the microprocessor core which I can completely implement by logic composition. I can implement the soft processor on various semiconductors including the programmable logic (such as FPGA, CPLD).

An example of the soft processor includes following.

• MicroBlaze
• Nios II

Comparison of the soft processor core

Processor	Origin of development	Open source	Bus support	Remarks	Web of the project
OpenSPARC T1	The sun	Yes		64 bits	OpenSPARC.net
MicroBlaze	ザイリンクス	No	OPB, FSL, LMB	32 bits	Xilinx MicroBlaze
PicoBlaze	ザイリンクス	Yes		8 bits	Xilinx PicoBlaze
Nios, Nios II	Altera	No		32 bits (Nios II)	Altera Nios II
Cortex-M1	ARM	No		32 bits	[1]
Mico32	Lattice semiconductor	Yes	Wishbone (en:Wishbone)	32 bits	LatticeMico32
Mico8	Lattice semiconductor	Yes	Wishbone (en:Wishbone)	8 bits	LatticeMico8
LEON 3 (English version)	ESA	Yes	AMBA	With 25k gate, it is compatible with SPARC V8	Gaisler
OpenRISC	OpenCores (en:OpenCores)	Yes		32 bits, 64 bits, It supports ASIC, Altera, Xilinx	OR1K
AEMB	Shawn Tan	Yes	Wishbone (en:Wishbone)	32 bits, MicroBlaze EDK 3.2 Verilog core and compatibility	AEMB
OpenFire	Virginia Tech CCM Lab	Yes	OPB, FSL	32 bits, MicroBlaze and binary compatible	VT OpenFire
PacoBlaze	Pablo Bleyer	Yes		8 bits, PicoBlaze and compatibility	PacoBlaze

Allied item

• Microprocessor
• Microcontroller
• CPU design
• CPU
• Processor
• Bit slice
• IP core
• SoC (System-on-a-chip)
• SoPC (System on Programmable Chip)
• FPGA (Field-programmable gate array)
• Can reconstitute it; computing

Outside link

• Detailed comparison of 12 kinds of soft processors
• FPGA CPU news
• Web site of the Freedom CPU
• Microprocessor core - Opencores.org

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This article is taken from the Japanese Wikipedia Soft processor

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